Names beginning with S: sacaton, saddle, saddleback, safflower, sage, sagebrush, sagewort, sago-pondweed, saintfoin, saitas, salad, salal, salmonberry, salsify, salt and pepper, salt cedar, saltbush, saltcedar, saltgrass, saltlover, saltsage, saltwort, sand verbena, sandbur, sandcarpet, sandfain, sandmat, sandozi, sandspurry, sandverbena, sandweed, sandwort, sandy, sanicle, sarsaparilla, saskatoon, satyr's-beard, saucer, sawgill, sawtooth, sawwort, saxifrage, scaber-stalk, scaberstalk, scalepod, scaly-cap, scalycap, scent-bottle, scheuchzeria, Scleroderma, scorpion-grass, scorpion-weed, scorzonella, scouring rush, scrambled eggs, scratchgrass, scurf-pea, scurvy-grass, sea-blush, sea-pink, sea-rocket, sea-watch, seablite, seal, seawrack, sedge, seepweed, sego-lily, self-heal, semaphore grass, senna, serpent-grass, serpentweed, service-tree, serviceberry, shadscale, shag, shaggy-mane, shaggy-stem, shank, shanklet, sheepburr, sheepfat, shelf, shepherd's-needle, shepherd's-purse, shield, shield-cup, shooting star, shooting-star, shotweed, sibbaldia, sickener, sicklegrass, sidalcea, sidebells, silene, silky-bent, silver-berry, silverback, silvercrown, silverpuffs, silverweed, single-delight, six-weeks grass, skeletonplant, skeletonweed, skullcap, skunkbush, skunkweed, sky-pilot, skyrocket, slipperycap, sloughgrass, smartweed, smelowskia, smoke, smooth medic, smotherweed, snakeroot, snakeweed, snapdragon, sneezeweed, snout, snow-in-summer, snow-queen, snowberry, snowdrops, snowflake, snuffbox, soapberry, soapwort, softgrass, soliva, Solomon's-seal, soopolallie, sorghum, sorrel, sow-thistle, sowbane, Spanish-broom, Sparassis, spatterdock, spearmint, spearwort, speedwell, sphere-thrower, spiderflower, spike, spike-primrose, spike-rush, spikemoss, spikenard, spikerush, spikeweed, spinach, spindle tree, spindles, spine, spineflower, spiraea, splashcup, spleenwort, split-gill, sponge-plant, spoonwort, spot, spotted water-hemlock, sprangletop, spring parsley, spring-gold, springbeauty, spruce, spurge, spurge-laurel, spurry, squashberry, squirreltail, St. John's wort, stag's-horn, staggerweed, staghorn, stagshorn, stain, stainer, stalk, stanleya, star-of-bethleham, star-of-Bethlehem, star-thistle, star-tulip, starflower, stargrass, starwort, steeplebush, steer's-head, steinpilz, stenotus, stephanomeria, Stereum, stichwort, stickseed, sticktight, sticky-laurel, sticky-willy, stiltball, stinker, stinkgrass, stinkhorn, stinkweed, stinky-Bob, stitchwort, stock, stonecrop, stoneseed, stool, stork's-bill, stranvaesia, strapwort, strawberries-and-cream, strawberry, strawberry-blight, streaks, streptanthella, Stropharia, stubby-stalk, succory, sugarbowls, sugarstick, Suillus, sulfur flower, sulfurflower, sulphur lichen, sumac, suncup, sundew, sunflower, sunshine, surf-grass, swainsonpea, swamp laurel, swampcandles, sweet-cicely, sweet-clover, sweet-vetch, sweetbrier, sweetflag, sweetgale, sweetgrass, swertia, swinecress, sword-fern, sycamore, synthyris
Sacaton
alkali sacaton (Sporobolus airoides) – 5 photos
Saddle
dark elfin saddle (Helvella atra) – 2 photos
elfin saddle (Helvella vespertina) – 7 photos
felt saddle (Helvella macropus) – 1 photo
white saddle (Helvella crispa) – 5 photos
Saddleback
saddleback (Helvella crispa) – 5 photos
Safflower
Sage
African sage (Salvia aethiopis) – 20 photos
fleshy sage (Salvia dorrii var. incana) – 18 photos
gray ball sage (Salvia dorrii) – 29 photos
gray-ball sage (Salvia dorrii var. incana) – 18 photos
prairie sage (Artemisia ludoviciana) – 10 photos
prairie-meadow sage (Salvia pratensis) – 2 photos
purple sage (Salvia dorrii) – 29 photos
Sagebrush
big sagebrush (Artemisia tridentata) – 15 photos
big sagebrush (Artemisia tridentata ssp. tridentata) – 15 photos
cut-leaf sagebrush (Artemisia tripartita) – 2 photos
cutleaf sagebrush (Artemisia tripartita ssp. tripartita) – 27 photos
dwarf sagebrush (Artemisia arbuscula) – 12 photos
hoary sagebrush (Artemisia cana) – 14 photos
little sagebrush (Artemisia arbuscula ssp. arbuscula) – 20 photos
low sagebrush (Artemisia arbuscula) – 12 photos
low sagebrush (Artemisia arbuscula ssp. arbuscula) – 20 photos
mountain big sagebrush (Artemisia tridentata ssp. vaseyana) – 37 photos
prairie sagebrush (Artemisia frigida) – 8 photos
scabland sagebrush (Artemisia rigida) – 37 photos
silver sagebrush (Artemisia cana) – 14 photos
snowfield sagebrush (Artemisia spiciformis) – 4 photos
spiked sagebrush (Artemisia spiciformis) – 4 photos
stiff sagebrush (Artemisia rigida) – 37 photos
threetip sagebrush (Artemisia tripartita) – 2 photos
threetip sagebrush (Artemisia tripartita ssp. tripartita) – 27 photos
Vasey sagebrush (Artemisia tridentata ssp. vaseyana) – 37 photos
Wyoming sagebrush (Artemisia tridentata ssp. wyomingensis) – 3 photos
Sagewort
Columbia Islands sagewort (Artemisia campestris var. wormskioldii) – 22 photos
Douglas's sagewort (Artemisia douglasiana) – 22 photos
dragon sagewort (Artemisia dracunculus) – 26 photos
gray sagewort (Artemisia ludoviciana ssp. candicans) – 31 photos
intermediate sagewort (Artemisia ludoviciana ssp. incompta) – 32 photos
lemon sagewort (Artemisia michauxiana) – 22 photos
Louisiana sagewort (Artemisia ludoviciana ssp. ludoviciana) – 46 photos
mountain sagewort (Artemisia norvegica) – 3 photos
mountain sagewort (Artemisia norvegica ssp. saxatilis) – 1 photo
Pacific sagewort (Artemisia campestris) – 11 photos
Pacific sagewort (Artemisia campestris var. scouleriana) – 9 photos
prairie sagewort (Artemisia frigida) – 8 photos
Suksdorf's sagewort (Artemisia suksdorfii) – 31 photos
sweet sagewort (Artemisia annua) – 4 photos
Wormskiold's wormwood sagewort (Artemisia campestris var. wormskioldii) – 22 photos
Sago-pondweed
sago-pondweed (Stuckenia pectinata) – 20 photos
Saintfoin
Saitas
northern saitas (Dichelostemma congestum) – 45 photos
Salad
salmon salad (Guepinia helvelloides) – 5 photos
Salal
Salmonberry
salmonberry (Rubus spectabilis) – 58 photos
Salsify
meadow salsify (Tragopogon pratensis) – 45 photos
purple salsify (Tragopogon porrifolius) – 27 photos
yellow salsify (Tragopogon dubius) – 73 photos
Salt and pepper
salt and pepper (Lomatium gormanii) – 48 photos
Salt cedar
hybrid salt cedar (Tamarix chinensis × Tamarix ramosissima Hybrid) – 12 photos
salt cedar (Tamarix ramosissima) – 27 photos
small-flower salt cedar (Tamarix parviflora) – 25 photos
Saltbush
Australian saltbush (Atriplex semibaccata) – 3 photos
Baltic saltbush (Atriplex longipes) – 2 photos
berry saltbush (Atriplex semibaccata) – 3 photos
creeping saltbush (Atriplex semibaccata) – 3 photos
fourwing saltbush (Atriplex canescens) – 8 photos
Gardner's saltbush (Atriplex gardneri) – 2 photos
gardner's saltbush (Atriplex gardneri var. falcata) – 16 photos
Gmelin's saltbush (Atriplex gmelinii) – 23 photos
Gmelin's saltbush (Atriplex gmelinii var. gmelinii) – 8 photos
hoary saltbush (Atriplex canescens) – 8 photos
hoary saltbush (Atriplex canescens var. canescens) – 1 photo
saline saltbush (Atriplex dioica) – 14 photos
sickle saltbush (Atriplex gardneri var. falcata) – 16 photos
spiny saltbush (Atriplex confertifolia) – 8 photos
Saltcedar
Chinese saltcedar (Tamarix chinensis) – 1 photo
hybrid saltcedar (Tamarix chinensis × Tamarix ramosissima Hybrid) – 12 photos
small-flower saltcedar (Tamarix parviflora) – 25 photos
Saltgrass
Saltlover
Saltsage
Saltwort
low saltwort (Salicornia depressa) – 6 photos
red glasswort saltwort (Salicornia rubra) – 2 photos
Sand verbena
honey-scented sandverbena (Abronia mellifera) – 40 photos
honey-scented sandverbena (Abronia mellifera var. mellifera) – 3 photos
pink sand verbena (Abronia umbellata) – 4 photos
sand verbena (Abronia umbellata var. breviflora) – 11 photos
white sand verbena (Abronia mellifera var. mellifera) – 3 photos
yellow sand verbena (Abronia latifolia) – 48 photos
Sandbur
longspine sandbur (Cenchrus longispinus) – 30 photos
mat sandbur (Cenchrus longispinus) – 30 photos
Sandcarpet
sandcarpet (Cardionema ramosissimum) – 15 photos
Sandfain
Sandmat
rib seed sandmat (Euphorbia glyptosperma) – 21 photos
Sandozi
fuzzy sandozi (Bridgeoporus nobilissimus) – 1 photo
Sandspurry
beach sandspurry (Spergularia macrotheca) – 1 photo
beach sandspurry (Spergularia macrotheca var. macrotheca) – 5 photos
Canada sandspurry (Spergularia canadensis) – 6 photos
Canadian sandspurry (Spergularia canadensis var. occidentalis) – 8 photos
red sandspurry (Spergularia rubra) – 50 photos
saltmarsh sandspurry (Spergularia salina) – 15 photos
Sandverbena
Pahove sandverbena (Abronia mellifera var. pahoveorum) – 1 photo
Sandweed
Sandwort
alpine sandwort (Cherleria obtusiloba) – 27 photos
annual sandwort (Sabulina pusilla) – 3 photos
ballhead sandwort (Eremogone congesta) – 8 photos
ballhead sandwort (Eremogone congesta var. cephaloidea) – 5 photos
ballhead sandwort (Eremogone congesta var. congesta) – 34 photos
ballhead sandwort (Eremogone congesta var. prolifera) – 5 photos
basalt sandwort (Sabulina basaltica) – 34 photos
blunt-leaf sandwort (Moehringia lateriflora) – 15 photos
bluntleaf sandwort (Moehringia lateriflora) – 15 photos
brittle sandwort (Sabulina nuttallii var. fragilis) – 8 photos
capitate sandwort (Eremogone congesta) – 8 photos
dwarf sandwort (Sabulina pusilla) – 3 photos
fescue sandwort (Eremogone capillaris var. americana) – 40 photos
Franklin's sandwort (Eremogone franklinii) – 32 photos
Franklin's sandwort (Eremogone franklinii var. franklinii) – 18 photos
large-leaf sandwort (Moehringia macrophylla) – 44 photos
marsh sandwort (Arenaria paludicola) – 3 photos
mountain sandwort (Eremogone capillaris) – 16 photos
needle-leaf sandwort (Eremogone aculeata) – 20 photos
Nuttall's sandwort (Sabulina nuttallii) – 17 photos
Nuttall's sandwort (Sabulina nuttallii var. nuttallii) – 60 photos
Olympic sandwort (Sabulina basaltica) – 34 photos
prickly sandwort (Eremogone aculeata) – 20 photos
seabeach sandwort (Honckenya peploides) – 28 photos
seabeach sandwort (Honckenya peploides ssp. major) – 6 photos
sharptip sandwort (Eremogone congesta var. cephaloidea) – 5 photos
slender sandwort (Sabulina macra) – 16 photos
Thompson's sandwort (Eremogone franklinii var. thompsonii) – 3 photos
thread-leaved sandwort (Eremogone capillaris) – 16 photos
thread-leaved sandwort (Eremogone capillaris var. americana) – 40 photos
thyme-leaf sandwort (Arenaria serpyllifolia) – 14 photos
thyme-leaf sandwort (Arenaria serpyllifolia var. serpyllifolia) – 25 photos
Twin Sisters sandwort (Sabulina sororia) – 23 photos
two-flowered sandwort (Cherleria biflora) – 10 photos
Sandy
Sanicle
bear's-foot sanicle (Sanicula arctopoides) – 32 photos
Pacific sanicle (Sanicula crassicaulis) – 32 photos
Pacific sanicle (Sanicula crassicaulis var. crassicaulis) – 22 photos
Pacific sanicle (Sanicula crassicaulis var. tripartita) – 5 photos
purple sanicle (Sanicula bipinnatifida) – 26 photos
Sarsaparilla
wild sarsaparilla (Aralia nudicaulis) – 20 photos
Saskatoon
saskatoon (Amelanchier alnifolia) – 154 photos
Satyr's-beard
satyr's-beard (Hericium erinaceus) – 2 photos
Saucer
red saucer (Melastiza chateri) – 2 photos
Sawgill
scaly sawgill (Neolentinus lepideus) – 3 photos
Sawtooth
giant sawtooth (Neolentinus ponderosus) – 6 photos
Sawwort
American sawwort (Saussurea americana) – 23 photos
Saxifrage
alpine saxifrage (Micranthes tolmiei) – 46 photos
bog saxifrage (Micranthes oregana) – 90 photos
brook saxifrage (Micranthes odontoloma) – 43 photos
Cascades dotted saxifrage (Micranthes nelsoniana var. cascadensis) – 11 photos
Clayton's saxifrage (Micranthes fragosa) – 53 photos
Columbia saxifrage (Micranthes nidifica) – 26 photos
Columbian saxifrage (Micranthes integrifolia) – 49 photos
dotted saxifrage (Micranthes nelsoniana) – 35 photos
dotted saxifrage (Micranthes nelsoniana var. cascadensis) – 11 photos
Gorman's saxifrage (Micranthes gormanii) – 9 photos
Hitchcock's saxifrage (Micranthes hitchcockiana) – 5 photos
Idaho saxifrage (Micranthes idahoensis) – 27 photos
leatherleaf saxifrage (Leptarrhena pyrolifolia) – 59 photos
Lyall's saxifrage (Micranthes lyallii) – 32 photos
matted saxifrage (Saxifraga austromontana) – 47 photos
matted saxifrage (Saxifraga vespertina) – 19 photos
Merten's saxifrage (Saxifraga mertensiana) – 53 photos
mountain saxifrage (Micranthes occidentalis) – 58 photos
Nelson's saxifrage (Micranthes nelsoniana var. cascadensis) – 22 photos
nodding saxifrage (Saxifraga cernua) – 4 photos
Nuttall's saxifrage (Cascadia nuttallii) – 27 photos
Olympic saxifrage (Micranthes tischii) – 32 photos
Oregon saxifrage (Micranthes oregana) – 45 photos
purple mountain saxifrage (Saxifraga oppositifolia ssp. oppositifolia) – 1 photo
purple saxifrage (Saxifraga oppositifolia) – 15 photos
purple saxifrage (Saxifraga oppositifolia ssp. oppositifolia) – 1 photo
pygmy saxifrage (Saxifraga hyperborea) – 9 photos
red-stemmed saxifrage (Micranthes lyallii) – 32 photos
redwool saxifrage (Micranthes occidentalis) – 58 photos
rue-leaved saxifrage (Saxifraga tridactylites) – 3 photos
rusty saxifrage (Micranthes ferruginea) – 64 photos
rusty-hair saxifrage (Micranthes rufidula) – 26 photos
spotted saxifrage (Saxifraga austromontana) – 47 photos
spotted saxifrage (Saxifraga vespertina) – 19 photos
strawberry saxifrage (Saxifragopsis fragarioides) – 14 photos
streambank saxifrage (Micranthes odontoloma) – 43 photos
swamp saxifrage (Micranthes integrifolia) – 49 photos
swamp saxifrage (Micranthes nidifica) – 26 photos
Tiny swamp saxifrage (Micranthes apetala) – 15 photos
Tolmie's alpine saxifrage (Micranthes tolmiei) – 46 photos
Tolmie's saxifrage (Micranthes tolmiei) – 46 photos
tufted alpine saxifrage (Saxifraga cespitosa) – 57 photos
tufted saxifrage (Saxifraga cespitosa) – 57 photos
twinflowered saxifrage (Saxifraga oppositifolia) – 15 photos
twinflowered saxifrage (Saxifraga oppositifolia ssp. oppositifolia) – 1 photo
wedge-leaf saxifrage (Saxifraga adscendens) – 2 photos
western saxifrage (Micranthes occidentalis) – 116 photos
western swamp saxifrage (Micranthes apetala) – 15 photos
whole-leaf saxifrage (Micranthes integrifolia) – 49 photos
woodland saxifrage (Saxifraga mertensiana) – 53 photos
Scaber-stalk
aspen scaber-stalk (Leccinum insigne) – 4 photos
common scaber-stalk (Leccinum scabrum) – 9 photos
red-capped scaber-stalk (Leccinum aurantiacum) – 1 photo
Scaberstalk
aspen scaberstalk (Leccinum aurantiacum) – 1 photo
birch scaberstalk (Leccinum scabrum) – 9 photos
Scalepod
Scaly-cap
bonfire scaly-cap (Pholiota highlandensis) – 3 photos
conifer scaly-cap (Pholiota astragalina) – 4 photos
flaming scaly-cap (Pholiota flammans) – 9 photos
golden scaly-cap (Pholiota aurivella) – 7 photos
Scalycap
golden scalycap (Pholiota aurivella) – 7 photos
Scent-bottle
scent-bottle (Platanthera dilatata) – 48 photos
Scheuchzeria
scheuchzeria (Scheuchzeria palustris) – 21 photos
Scleroderma
golden Scleroderma (Scleroderma citrinum) – 2 photos
Scorpion-grass
blue scorpion-grass (Myosotis micrantha) – 6 photos
blue scorpion-grass (Myosotis stricta) – 18 photos
early scorpion-grass (Myosotis verna) – 1 photo
field scorpion-grass (Myosotis arvensis) – 68 photos
spring scorpion-grass (Myosotis verna) – 1 photo
yellow and blue scorpiongrass (Myosotis discolor) – 32 photos
Scorpion-weed
Bolander's scorpion-weed (Phacelia bolanderi) – 18 photos
changeable scorpion-weed (Phacelia mutabilis) – 9 photos
dwarf scorpion-weed (Phacelia minutissima) – 8 photos
Franklin's scorpion-weed (Phacelia franklinii) – 2 photos
glandular-hair scorpion-weed (Phacelia glandulifera) – 12 photos
narrow-sepal scorpion-weed (Phacelia hastata var. leptosepala) – 21 photos
sticky scorpion-weed (Phacelia lenta) – 8 photos
tall scorpion-weed (Phacelia procera) – 43 photos
thread-leaf scorpion-weed (Phacelia linearis) – 78 photos
Scorzonella
cut leaved scorzonella (Microseris laciniata ssp. laciniata) – 8 photos
nodding scorzonella (Microseris nutans) – 68 photos
Scouring rush
common scouring rush (Equisetum hyemale) – 30 photos
common scouring rush (Equisetum hyemale ssp. affine) – 8 photos
Dutch scouring rush (Equisetum hyemale ssp. affine) – 8 photos
dwarf scouring rush (Equisetum scirpoides) – 15 photos
Ferriss's scouring rush (Equisetum ×ferrissii) – 26 photos
northern scouring rush (Equisetum variegatum) – 15 photos
northern scouring rush (Equisetum variegatum ssp. variegatum) – 2 photos
prairie scouring rush (Equisetum hyemale ssp. affine) – 8 photos
smooth scouring rush (Equisetum laevigatum) – 26 photos
Scrambled eggs
scrambled eggs (Corydalis aurea) – 9 photos
scrambled eggs (Corydalis aurea ssp. aurea) – 9 photos
Scratchgrass
scratchgrass (Muhlenbergia asperifolia) – 15 photos
Scurf-pea
forest scurf-pea (Rupertia physodes) – 12 photos
lance-leaf scurfpea (Ladeania lanceolata) – 30 photos
lemon scurf-pea (Ladeania lanceolata) – 30 photos
Scurvy-grass
Danish scurvy-grass (Cochlearia groenlandica) – 6 photos
scurvy-grass (Cochlearia groenlandica) – 6 photos
Sea-blush
Sea-pink
Sea-rocket
American sea-rocket (Cakile edentula) – 8 photos
American sea-rocket (Cakile edentula var. edentula) – 3 photos
European sea-rocket (Cakile maritima) – 35 photos
European sea-rocket (Cakile maritima ssp. maritima) – 3 photos
sea-rocket (Cakile maritima) – 35 photos
sea-rocket (Cakile maritima ssp. maritima) – 3 photos
Sea-watch
Seablite
common seablite (Suaeda calceoliformis) – 23 photos
horned seablite (Suaeda calceoliformis) – 23 photos
slender seablite (Suaeda occidentalis) – 4 photos
Seal
plumed Solomon's seal (Maianthemum racemosum ssp. amplexicaule) – 30 photos
Seawrack
Sedge
abrupt-beaked sedge (Carex abrupta) – 3 photos
Alaska singlespike sedge (Carex scirpoidea ssp. stenochlaena) – 2 photos
analogue sedge (Carex simulata) – 2 photos
awl-fruited sedge (Carex stipata) – 13 photos
awl-fruited sedge (Carex stipata var. stipata) – 21 photos
awned sedge (Carex atherodes) – 8 photos
beaked sedge (Carex utriculata) – 57 photos
bearded sedge (Carex comosa) – 24 photos
Bebb's sedge (Carex bebbii) – 18 photos
big inflated sedge (Carex exsiccata) – 14 photos
big-leaf sedge (Carex amplifolia) – 24 photos
bighead sedge (Carex macrocephala) – 28 photos
black alpine sedge (Carex nigricans) – 9 photos
black bog sedge (Carex pluriflora) – 10 photos
black-and-white-scaled sedge (Carex albonigra) – 5 photos
black-scale sedge (Carex atrosquama) – 4 photos
blunt broom sedge (Carex tribuloides var. tribuloides) – 1 photo
blunt sedge (Carex obtusata) – 6 photos
Bolander's sedge (Carex bolanderi) – 7 photos
boreal bog sedge (Carex magellanica) – 7 photos
Brewer's sedge (Carex breweri) – 5 photos
bristle-leaf sedge (Isolepis setacea) – 7 photos
bristly sedge (Carex comosa) – 24 photos
brown bog sedge (Carex buxbaumii) – 21 photos
brown sedge (Carex brunnescens) – 10 photos
Buxbaum's sedge (Carex buxbaumii) – 21 photos
California sedge (Carex californica) – 4 photos
capitate sedge (Carex capitata) – 2 photos
cloud sedge (Carex haydeniana) – 2 photos
clustered field sedge (Carex praegracilis) – 8 photos
coastal shore sedge (Carex kelloggii var. limnophila) – 3 photos
coastal star sedge (Carex echinata ssp. phyllomanica) – 1 photo
coiled sedge (Carex circinata) – 3 photos
Columbia sedge (Carex aperta) – 18 photos
common woolly sedge (Scirpus atrocinctus) – 2 photos
Constance's sedge (Carex davyi) – 4 photos
cordilleran sedge (Carex cordillerana) – 11 photos
cordroot sedge (Carex chordorrhiza) – 2 photos
Crawford's sedge (Carex crawfordii) – 12 photos
creeping sedge (Carex chordorrhiza) – 2 photos
Cusick's sedge (Carex cusickii) – 26 photos
Davy's sedge (Carex davyi) – 4 photos
delicate sedge (Carex leptalea) – 20 photos
dense sedge (Carex densa) – 3 photos
Dewey's sedge (Carex deweyana) – 4 photos
Dewey's sedge (Carex deweyana var. deweyana) – 14 photos
different-veined sedge (Carex heteroneura) – 3 photos
Douglas's sedge (Carex douglasii) – 37 photos
Engelmann's sedge (Carex engelmannii) – 2 photos
European woodland sedge (Carex sylvatica) – 4 photos
false golden sedge (Carex hassei) – 4 photos
few-flowered sedge (Carex pauciflora) – 7 photos
firethread sedge (Carex scopulorum var. prionophyllum) – 10 photos
fragile-sheath sedge (Carex fracta) – 1 photo
Geyer's sedge (Carex geyeri) – 37 photos
golden sedge (Carex aurea) – 34 photos
grassy-slope arctic sedge (Carex anthoxanthea) – 6 photos
green sedge (Carex viridula) – 5 photos
green-fruited sedge (Carex interrupta) – 4 photos
green-sheath sedge (Carex feta) – 11 photos
greenish sedge (Carex viridula ssp. viridula) – 26 photos
grey sedge (Carex canescens ssp. canescens) – 14 photos
hair sedge (Carex capillaris) – 3 photos
halfchaff sedge (Lipocarpha aristulata) – 4 photos
Hall's sedge (Carex halliana) – 9 photos
hare sedge (Carex leporina) – 7 photos
Hayden's sedge (Carex haydeniana) – 2 photos
Henderson's sedge (Carex hendersonii) – 20 photos
Hood's sedge (Carex hoodii) – 34 photos
Idaho sedge (Carex idahoa) – 1 photo
inflated sedge (Carex utriculata) – 57 photos
inflated sedge (Carex vesicaria) – 42 photos
inland sedge (Carex interior) – 24 photos
interrupted sedge (Carex interrupta) – 4 photos
Japanese sedge (Carex kobomugi) – 1 photo
jelly bean sedge (Carex leptalea) – 20 photos
Jones' sedge (Carex jonesii) – 1 photo
Kellogg's sedge (Carex kelloggii) – 7 photos
Kellogg's sedge (Carex kelloggii var. kelloggii) – 20 photos
lake sedge (Carex lacustris) – 14 photos
Lake Tahoe sedge (Carex tahoensis) – 2 photos
lakeshore sedge (Carex kelloggii) – 7 photos
lakeshore sedge (Carex kelloggii var. kelloggii) – 20 photos
Leers's sedge (Carex divulsa) – 3 photos
lesser panicled sedge (Carex diandra) – 15 photos
lesser tussock sedge (Carex diandra) – 15 photos
Liddon's sedge (Carex petasata) – 1 photo
limestone sedge (Carex saxatilis) – 12 photos
little green sedge (Carex viridula ssp. viridula) – 26 photos
long-awn sedge (Carex macrochaeta) – 7 photos
long-stolon sedge (Carex inops) – 10 photos
long-stolon sedge (Carex inops ssp. inops) – 3 photos
long-style sedge (Carex stylosa) – 5 photos
Lyngbye's sedge (Carex lyngbyei) – 20 photos
many-headed sedge (Carex sychnocephala) – 7 photos
Mertens' sedge (Carex mertensii) – 29 photos
Montana sedge (Carex media) – 4 photos
mountain hare sedge (Carex phaeocephala) – 7 photos
mountain sedge (Carex scopulorum) – 1 photo
narrow-leaved sedge (Carex angustata) – 6 photos
Nebraska sedge (Carex nebrascensis) – 26 photos
northern beaked sedge (Carex rostrata) – 24 photos
northern clustered sedge (Carex arcta) – 14 photos
northern meadow sedge (Carex praticola) – 11 photos
northern sedge (Carex deflexa var. boottii) – 2 photos
northern single-spike sedge (Carex scirpoidea ssp. scirpoidea) – 4 photos
Northwest Territory sedge (Carex utriculata) – 57 photos
northwestern sedge (Carex concinnoides) – 34 photos
one-sided sedge (Carex unilateralis) – 3 photos
oval broom sedge (Carex leporina) – 7 photos
oval sedge (Carex leporina) – 7 photos
oxbow sedge (Carex vesicaria) – 42 photos
Pacific bog sedge (Kobresia myosuroides) – 8 photos
pale sedge (Carex livida) – 4 photos
Parry's sedge (Carex parryana) – 3 photos
Payson's sedge (Carex paysonis) – 3 photos
pendulous sedge (Carex pendula) – 10 photos
Plains oval sedge (Carex brevior) – 24 photos
poor sedge (Carex magellanica) – 7 photos
poor sedge (Carex magellanica ssp. irrigua) – 2 photos
porcupine sedge (Carex hystericina) – 37 photos
Presl's sedge (Carex preslii) – 2 photos
pumpkin sedge (Carex aurea) – 34 photos
quill sedge (Carex tenera) – 2 photos
Raynolds' sedge (Carex raynoldsii) – 16 photos
retrorse sedge (Carex retrorsa) – 18 photos
rope-root sedge (Carex chordorrhiza) – 2 photos
Ross' sedge (Carex rossii) – 24 photos
russet sedge (Carex saxatilis) – 12 photos
rusty sedge (Carex subfusca) – 6 photos
sand sedge (Carex pansa) – 2 photos
sawbeak sedge (Carex stipata) – 13 photos
sawbeak sedge (Carex stipata var. stipata) – 21 photos
Scandinavian sedge (Carex media) – 4 photos
short-beaked sedge (Carex brevior) – 24 photos
short-leaf sedge (Carex disperma) – 12 photos
short-scaled sedge (Carex leptopoda) – 16 photos
short-stemmed sedge (Carex zikae) – 7 photos
showy sedge (Carex spectabilis) – 27 photos
Sierra alpine sedge (Carex scopulorum var. bracteosa) – 24 photos
Sierra hare sedge (Carex leporinella) – 3 photos
silvery sedge (Carex canescens) – 22 photos
silvery sedge (Carex canescens ssp. canescens) – 14 photos
single-spike sedge (Carex scirpoidea) – 11 photos
Sitka sedge (Carex aquatilis var. dives) – 15 photos
slender sedge (Carex tenera) – 2 photos
slender-beak sedge (Carex athrostachya) – 22 photos
slenderfoot sedge (Carex leptopoda) – 16 photos
slough sedge (Carex obnupta) – 24 photos
small-bracted sedge (Carex subbracteata) – 3 photos
small-head sedge (Carex illota) – 17 photos
small-winged sedge (Carex microptera) – 37 photos
Smoky Mountain sedge (Carex proposita) – 5 photos
smooth-fruited sedge (Carex heteroneura) – 3 photos
smooth-stemmed sedge (Carex laeviculmis) – 16 photos
sparse-flower sedge (Carex tenuiflora) – 4 photos
spikenard sedge (Carex nardina) – 14 photos
spring sedge (Carex luzulina) – 14 photos
star sedge (Carex echinata) – 14 photos
star sedge (Carex echinata ssp. echinata) – 16 photos
starry sedge (Carex pachystachya) – 15 photos
teacher's sedge (Carex praeceptorum) – 4 photos
tetrastigmatic sedge (Carex concinnoides) – 34 photos
thick-headed sedge (Carex pachystachya) – 15 photos
thread-leaf sedge (Carex filifolia var. filifolia) – 5 photos
thread-leaved sedge (Carex filifolia) – 9 photos
three-way sedge (Dulichium arundinaceum) – 33 photos
timberline sedge (Carex micropoda) – 3 photos
torrent sedge (Carex nudata) – 12 photos
walking sedge (Eleocharis rostellata) – 8 photos
water sedge (Carex aquatilis) – 6 photos
water sedge (Carex aquatilis var. aquatilis) – 25 photos
weak-veined sedge (Carex infirminervia) – 14 photos
wheat sedge (Carex atherodes) – 8 photos
wiregrass sedge (Carex lasiocarpa) – 42 photos
woodrush sedge (Carex luzulina) – 21 photos
woolly sedge (Carex pellita) – 26 photos
yellow bog sedge (Carex gynocrates) – 10 photos
yellow sedge (Carex flava) – 35 photos
yellow-flowered sedge (Carex anthoxanthea) – 6 photos
yellow-green sedge (Carex flava) – 35 photos
Zika's sedge (Carex zikae) – 7 photos
Seepweed
bushy seablite seepweed (Suaeda nigra) – 8 photos
western seepweed (Suaeda occidentalis) – 4 photos
Sego-lily
elegant sego-lily (Calochortus elegans) – 24 photos
long-bearded sego-lily (Calochortus longebarbatus) – 32 photos
Self-heal
Semaphore grass
nodding semaphore grass (Pleuropogon refractus) – 16 photos
Senna
bladder senna (Colutea arborescens) – 27 photos
Serpent-grass
serpent-grass (Bistorta vivipara) – 9 photos
Serpentweed
Lyall's serpentweed (Tonestus lyallii) – 25 photos
Service-tree
Swedish service-tree (Sorbus hybrida) – 3 photos
Serviceberry
serviceberry (Amelanchier alnifolia) – 154 photos
Utah serviceberry (Amelanchier utahensis) – 50 photos
Shadscale
Shag
Shaggy-mane
shaggy-mane (Coprinus comatus) – 10 photos
Shaggy-stem
shaggy-stem (Floccularia luteovirens) – 6 photos
Shank
velvet shank (Flammulina velutipes) – 3 photos
Shanklet
branched shanklet (Dendrocollybia racemosa (Collybia)) – 1 photo
lentil shanklet (Collybia tuberosa) – 4 photos
piggyback shanklet (Collybia cirrhata) – 3 photos
splitpea shanklet (Collybia cookei) – 3 photos
Sheepburr
bristly sheepburr (Lappula squarrosa) – 21 photos
Sheepfat
Shelf
sulphur shelf (Laetiporus conifericola) – 11 photos
Shepherd's-needle
shepherd's-needle (Scandix pecten-veneris) – 12 photos
Shepherd's-purse
shepherd's-purse (Capsella bursa-pastoris) – 28 photos
Shield
deer shield (Pluteus cervinus) – 9 photos
ghost shield (Pluteus pellitus) – 3 photos
goldleaf shield (Pluteus romellii (nanus)) – 3 photos
willow shield (Pluteus salicinus group) – 1 photo
Shield-cup
burn site shield cup (Ascobolus carbonarius) – 1 photo
Shooting star
Alaskan shooting star (Primula pauciflora var. macrocarpa) – 7 photos
alpine shooting star (Primula tetrandra) – 7 photos
broad-leaved shooting star (Primula hendersonii) – 41 photos
Cusick's shooting star (Primula pauciflora var. cusickii) – 32 photos
dark-throated shooting star (Primula pauciflora var. pauciflora) – 124 photos
desert shooting star (Primula conjugens) – 64 photos
frigid shooting star (Primula austrofrigidum) – 20 photos
Henderson's shooting star (Primula hendersonii) – 41 photos
Jeffrey's shooting star (Primula jeffreyi) – 76 photos
narcissus shooting star (Primula poetica) – 31 photos
poet's shooting star (Primula poetica) – 31 photos
pretty shooting star (Primula pauciflora) – 19 photos
slimpod shooting star (Primula conjugens) – 64 photos
sticky shooting star (Primula pauciflora var. cusickii) – 32 photos
tall mountain shooting star (Primula jeffreyi) – 76 photos
white shooting star (Primula latiloba) – 35 photos
Shooting-star
shooting-star (Sphaerobolus stellatus) – 4 photos
Shotweed
Sibbaldia
creeping sibbaldia (Sibbaldia procumbens) – 25 photos
Sickener
the sickener (Russula emetica) – 4 photos
Sicklegrass
sicklegrass (Parapholis incurva) – 3 photos
Sidalcea
meadow sidalcea (Sidalcea campestris) – 9 photos
Sidebells
Silene
Douglas's silene (Silene douglasii) – 17 photos
Parry's silene (Silene parryi) – 34 photos
Scouler's siliene (Silene scouleri) – 9 photos
Seely's silene (Silene seelyi) – 14 photos
Spalding's silene (Silene spaldingii) – 28 photos
Silky-bent
dense silky-bent (Apera interrupta) – 18 photos
Silver-berry
American silver-berry (Elaeagnus commutata) – 7 photos
Silverback
false silverback (Rainiera stricta) – 30 photos
littleleaf silverback (Luina hypoleuca) – 43 photos
Silvercrown
tall silvercrown (Cacaliopsis nardosmia) – 62 photos
Silverpuffs
coastal silverpuffs (Microseris bigelovii) – 1 photo
cut-leaved silverpuffs (Microseris laciniata ssp. leptosepala) – 7 photos
cutleaf silverpuffs (Microseris laciniata ssp. leptosepala) – 7 photos
Lindley's false silverpuffs (Uropappus lindleyi) – 23 photos
nodding silverpuffs (Microseris nutans) – 68 photos
northern silverpuffs (Microseris borealis) – 14 photos
silverpuffs (Uropappus lindleyi) – 23 photos
Silverweed
common silverweed (Potentilla anserina) – 10 photos
common silverweed (Potentilla anserina ssp. anserina) – 8 photos
Pacific silverweed (Potentilla anserina ssp. pacifica) – 36 photos
Single-delight
single-delight (Moneses uniflora) – 43 photos
Six-weeks grass
rattail six-weeks grass (Vulpia myuros) – 21 photos
Skeletonplant
rush skeletonplant (Lygodesmia juncea) – 8 photos
Skeletonweed
rush skeletonweed (Chondrilla juncea) – 32 photos
thorny skeletonweed (Pleiacanthus spinosus) – 11 photos
Skullcap
hooded skullcap (Scutellaria galericulata) – 26 photos
mad-dog skullcap (Scutellaria lateriflora) – 14 photos
marsh skullcap (Scutellaria galericulata) – 26 photos
narrow-leaved skullcap (Scutellaria angustifolia) – 5 photos
narrow-leaved skullcap (Scutellaria angustifolia ssp. angustifolia) – 25 photos
small-flowering narrow-leaved skullcap (Scutellaria angustifolia ssp. micrantha) – 10 photos
snapdragon skullcap (Scutellaria antirrhinoides) – 6 photos
Skunkbush
Skunkweed
Sky-pilot
Skyrocket
small-flower skyrocket (Microgilia minutiflora) – 19 photos
Slipperycap
Lake's slipperycap (Suillus lakei) – 4 photos
pale slipperycap (Suillus neoalbidipes) – 1 photo
pine slipperycap (Suillus pseudobrevipes) – 4 photos
Sloughgrass
American sloughgrass (Beckmannia syzigachne) – 26 photos
Smartweed
dock-leaf smartweed (Persicaria lapathifolia) – 42 photos
dotted smartweed (Persicaria punctata) – 15 photos
pale smartweed (Persicaria lapathifolia) – 42 photos
swamp smartweed (Persicaria hydropiperoides) – 34 photos
water smartweed (Persicaria amphibia) – 67 photos
water smartweed (Persicaria punctata) – 15 photos
Smelowskia
alpine smelowskia (Smelowskia americana) – 38 photos
short-fruited smelowskia (Smelowskia ovalis) – 38 photos
Siberian smelowskia (Smelowskia americana) – 38 photos
Smoke
prairie smoke (Geum triflorum) – 116 photos
Smooth medic
smooth medic (Medicago polymorpha) – 16 photos
Smotherweed
five-hook smotherweed (Bassia hyssopifolia) – 29 photos
Snakeroot
western snakeroot (Ageratina occidentalis) – 18 photos
Snakeweed
broom snakeweed (Gutierrezia sarothrae) – 7 photos
Snapdragon
garden snapdragon (Antirrhinum majus) – 1 photo
greater snapdragon (Antirrhinum majus) – 1 photo
lesser snapdragon (Misopates orontium) – 18 photos
Sneezeweed
common sneezeweed (Helenium autumnale) – 31 photos
large flowered sneezeweed (Helenium autumnale) – 31 photos
Snout
weasel's snout (Misopates orontium) – 18 photos
Snow-in-summer
snow-in-summer (Cerastium tomentosum) – 7 photos
Snow-queen
snow-queen (Veronica regina-nivalis) – 21 photos
Snowberry
common snowberry (Symphoricarpos albus) – 28 photos
common snowberry (Symphoricarpos albus var. albus) – 4 photos
common snowberry (Symphoricarpos albus var. laevigatus) – 51 photos
creeping snowberry (Gaultheria hispidula) – 1 photo
creeping snowberry (Symphoricarpos mollis) – 19 photos
creeping snowberry (Symphoricarpos mollis var. hesperius) – 16 photos
mountain snowberry (Symphoricarpos rotundifolius) – 2 photos
mountain snowberry (Symphoricarpos rotundifolius var. oreophilus) – 23 photos
mountain snowberry (Symphoricarpos rotundifolius var. vaccinioides) – 34 photos
spreading snowberry (Symphoricarpos mollis var. hesperius) – 8 photos
western snowberry (Symphoricarpos occidentalis) – 7 photos
Snowdrops
Snowflake
summer snowflake (Leucojum aestivum) – 7 photos
Snuffbox
devil's snuffbox (Lycoperdon perlatum) – 9 photos
Soapberry
Soapwort
rock soapwort (Saponaria ocymoides) – 3 photos
Softgrass
creeping softgrass (Holcus mollis) – 24 photos
Soliva
common soliva (Soliva sessilis) – 25 photos
prickly soliva (Soliva sessilis) – 25 photos
Solomon's-seal
star-flowered Solomon's-seal (Maianthemum stellatum) – 83 photos
two-leaf false Solomon's-seal (Maianthemum dilatatum) – 40 photos
Soopolallie
soopolallie (Shepherdia canadensis) – 29 photos
Sorghum
Sorrel
alpine sheep sorrel (Rumex paucifolius) – 9 photos
alpine sorrel (Rumex acetosa) – 12 photos
alpine sorrel (Rumex paucifolius) – 9 photos
common sheep sorrel (Rumex acetosella) – 36 photos
common sorrel (Rumex acetosa) – 12 photos
garden sorrel (Rumex acetosa) – 12 photos
Lapland sorrel (Rumex acetosa) – 12 photos
mountain sorrel (Rumex paucifolius) – 9 photos
Sow-thistle
common sow-thistle (Sonchus oleraceus) – 33 photos
corn sow-thistle (Sonchus arvensis ssp. arvensis) – 1 photo
field sow-thistle (Sonchus arvensis) – 14 photos
field sow-thistle (Sonchus arvensis ssp. arvensis) – 1 photo
field sow-thistle (Sonchus arvensis ssp. uliginosus) – 16 photos
marsh sow-thistle (Sonchus arvensis ssp. uliginosus) – 16 photos
perennial sow-thistle (Sonchus arvensis) – 14 photos
perennial sow-thistle (Sonchus arvensis ssp. arvensis) – 1 photo
prickly sow-thistle (Sonchus asper) – 53 photos
spiny leaf sow-thistle (Sonchus asper) – 53 photos
wet ground sow-thistle (Sonchus arvensis ssp. uliginosus) – 16 photos
Sowbane
Spanish-broom
Spanish-broom (Spartium junceum) – 1 photo
Sparassis
false Sparassis (Peziza proteana) – 1 photo
Spatterdock
spatterdock (Nuphar polysepala) – 53 photos
Spearmint
Spearwort
creeping spearwort (Ranunculus flammula var. ovalis) – 5 photos
creeping spearwort (Ranunculus flammula var. reptans) – 4 photos
lesser spearwort (Ranunculus flammula) – 43 photos
Speedwell
American alpine speedwell (Veronica wormskjoldii) – 48 photos
American speedwell (Veronica americana) – 62 photos
bird-eye speedwell (Veronica persica) – 25 photos
blue water speedwell (Veronica anagallis-aquatica) – 32 photos
chain speedwell (Veronica catenata) – 35 photos
common speedwell (Veronica officinalis) – 36 photos
corn speedwell (Veronica arvensis) – 17 photos
Cusick's speedwell (Veronica cusickii) – 65 photos
Germander speedwell (Veronica chamaedrys) – 9 photos
grass-leaf speedwell (Veronica scutellata) – 27 photos
ivy-leaf speedwell (Veronica hederifolia) – 17 photos
long-leaf speedwell (Veronica longifolia) – 1 photo
marsh speedwell (Veronica scutellata) – 27 photos
Persian speedwell (Veronica persica) – 25 photos
purslane speedwell (Veronica peregrina) – 6 photos
purslane speedwell (Veronica peregrina var. xalapensis) – 21 photos
skullcap speedwell (Veronica scutellata) – 27 photos
spring speedwell (Veronica verna) – 10 photos
thread-stalk speedwell (Veronica filiformis) – 10 photos
thyme-leaved speedwell (Veronica serpyllifolia) – 14 photos
thyme-leaved speedwell (Veronica serpyllifolia var. humifusa) – 36 photos
thyme-leaved speedwell (Veronica serpyllifolia var. serpyllifolia) – 23 photos
wall speedwell (Veronica arvensis) – 17 photos
Sphere-thrower
sphere-thrower (Sphaerobolus stellatus) – 4 photos
Spiderflower
yellow spiderflower (Peritoma lutea) – 29 photos
Spike
larch spike (Gomphidius maculatus) – 2 photos
slimy spike (Gomphidius glutinosus) – 8 photos
Spike-primrose
spike-primrose (Epilobium) – 4 photos
Spike-rush
few-flowered spike-rush (Eleocharis quinqueflora) – 16 photos
quill spike-rush (Eleocharis nitida) – 12 photos
Spikemoss
cliff spikemoss (Selaginella scopulorum) – 20 photos
festoon spikemoss (Selaginella oregana) – 21 photos
Oregon spikemoss (Selaginella oregana) – 21 photos
Rocky Mountain spikemoss (Selaginella scopulorum) – 20 photos
Wallace's spikemoss (Selaginella wallacei) – 32 photos
Spikenard
California spikenard (Aralia californica) – 1 photo
false spikenard (Maianthemum racemosum) – 49 photos
plumed spikenard (Maianthemum racemosum ssp. amplexicaule) – 30 photos
Spikerush
beaked spikerush (Eleocharis rostellata) – 8 photos
blunt spikerush (Eleocharis obtusa) – 25 photos
common spikerush (Eleocharis palustris) – 33 photos
creeping spikerush (Eleocharis macrostachya) – 24 photos
Engelman spikerush (Eleocharis engelmannii) – 3 photos
little-head spikerush (Eleocharis parvula) – 14 photos
needle spikerush (Eleocharis acicularis) – 31 photos
ovoid spikerush (Eleocharis ovata) – 2 photos
pretty spikerush (Eleocharis bella) – 9 photos
Suksdorf spikerush (Eleocharis suksdorfiana) – 10 photos
Spikeweed
common spikeweed (Centromadia pungens) – 4 photos
common spikeweed (Centromadia pungens ssp. pungens) – 16 photos
western spikeweed (Centromadia pungens ssp. pungens) – 16 photos
Spinach
French spinach (Atriplex hortensis) – 5 photos
New Zealand spinach (Tetragonia tetragonioides) – 5 photos
Spindle tree
European spindle tree (Euonymus europaeus) – 4 photos
Spindles
rose spindles (Clavaria rosea) – 1 photo
smoky spindles (Clavaria fumosa) – 2 photos
white spindles (Clavaria fragilis) – 2 photos
Spine
blue spine (Hydnellum caeruleum) – 5 photos
orange spine (Hydnellum aurantiacum) – 10 photos
sweet spine (Hydnellum suaveolens) – 7 photos
Spineflower
five-tooth spineflower (Chorizanthe watsonii) – 3 photos
Watson's spineflower (Chorizanthe watsonii) – 3 photos
Spiraea
Douglas's spiraea (Spiraea douglasii) – 27 photos
Douglas's spiraea (Spiraea douglasii var. douglasii) – 21 photos
Hitchcock's spiraea (Spiraea ×hitchcockii) – 10 photos
Menzies's spiraea (Spiraea douglasii var. menziesii) – 8 photos
pyramid spiraea (Spiraea ×pyramidata) – 18 photos
rosy spiraea (Spiraea splendens) – 57 photos
shiny-leaf spiraea (Spiraea lucida) – 36 photos
shinyleaf spiraea (Spiraea lucida) – 36 photos
subalpine spiraea (Spiraea splendens) – 171 photos
Splashcup
deep splashcup (Cyathus olla) – 3 photos
ribbed splashcup (Cyathus striatus) – 5 photos
Spleenwort
green spleenwort (Asplenium viride) – 14 photos
maidenhair spleenwort (Asplenium trichomanes) – 18 photos
maidenhair spleenwort (Asplenium trichomanes ssp. quadrivalens) – 1 photo
maidenhair spleenwort (Asplenium trichomanes ssp. trichomanes) – 7 photos
Split-gill
split-gill (Schizophyllum commune) – 16 photos
Sponge-plant
South American sponge-plant (Limnobium laevigatum) – 7 photos
Spoonwort
Spot
coral spot (Nectria cinnabarina) – 1 photo
Spotted water-hemlock
spotted water-hemlock (Cicuta maculata var. angustifolia) – 2 photos
Sprangletop
bearded sprangletop (Diplachne fusca ssp. fascicularis) – 7 photos
clustered salt-grassprangletop (Diplachne fusca) – 1 photo
loose-flowered sprangletop (Diplachne fusca) – 1 photo
Spring parsley
montane spring parsley (Cymopterus foeniculaceus) – 21 photos
turpentine spring parsley (Cymopterus terebinthinus) – 43 photos
Spring-gold
spring-gold (Crocidium multicaule) – 61 photos
spring-gold (Lomatium utriculatum) – 37 photos
Springbeauty
alpine springbeauty (Claytonia megarhiza) – 36 photos
broadleaf springbeauty (Claytonia cordifolia) – 44 photos
Great Basin springbeauty (Claytonia umbellata) – 13 photos
heart-leaf springbeauty (Claytonia cordifolia) – 44 photos
Lake Washington springbeauty (Claytonia washingtoniana) – 16 photos
lanceleaf springbeauty (Claytonia lanceolata) – 98 photos
Rydberg's springbeauty (Claytonia multiscapa) – 1 photo
sand springbeauty (Claytonia arenicola) – 12 photos
Siberian springbeauty (Claytonia sibirica) – 72 photos
small-flowered springbeauty (Claytonia parviflora) – 13 photos
streambank springbeauty (Montia parvifolia) – 54 photos
western springbeauty (Claytonia sibirica) – 72 photos
Spruce
Black Hills spruce (Picea glauca) – 5 photos
Engelmann spruce (Picea engelmannii var. engelmannii) – 2 photos
Engelmann's spruce (Picea engelmannii) – 49 photos
Porsild spruce (Picea glauca) – 5 photos
Sitka spruce (Picea sitchensis) – 49 photos
western white spruce (Picea glauca) – 5 photos
white spruce (Picea glauca) – 5 photos
Spurge
balkan spurge (Euphorbia oblongata) – 17 photos
broad leaved glaucous spurge (Euphorbia myrsinites) – 13 photos
caper spurge (Euphorbia lathyris) – 18 photos
corrugate seeded spurge (Euphorbia glyptosperma) – 21 photos
cypress spurge (Euphorbia cyparissias) – 6 photos
egg-leaf spurge (Euphorbia oblongata) – 17 photos
leafy spurge (Euphorbia virgata) – 31 photos
Mediterranean spurge (Euphorbia characias) – 4 photos
milk spurge (Euphorbia maculata) – 25 photos
myrtle spurge (Euphorbia myrsinites) – 13 photos
petty spurge (Euphorbia peplus) – 19 photos
reticulate seeded spurge (Euphorbia spathulata) – 14 photos
ridge seeded spurge (Euphorbia glyptosperma) – 21 photos
spatulate leaved spurge (Euphorbia spathulata) – 14 photos
spotted spurge (Euphorbia maculata) – 25 photos
summer spurge (Euphorbia helioscopia) – 5 photos
sun spurge (Euphorbia helioscopia) – 5 photos
thyme-leaved spurge (Euphorbia serpillifolia) – 22 photos
wart spurge (Euphorbia helioscopia) – 5 photos
warty spurge (Euphorbia spathulata) – 14 photos
Spurge-laurel
spurge-laurel (Daphne laureola) – 18 photos
Spurry
corn spurry (Spergula arvensis) – 12 photos
Squashberry
squashberry (Viburnum edule) – 37 photos
Squirreltail
big squirreltail (Elymus multisetus) – 3 photos
bottlebrush squirreltail (Elymus elymoides ssp. elymoides) – 26 photos
California squirreltail (Elymus elymoides ssp. elymoides) – 26 photos
longleaf squirreltail (Elymus elymoides ssp. brevifolius) – 3 photos
squirreltail (Elymus elymoides) – 19 photos
St. John's wort
bog St. John's wort (Hypericum anagalloides) – 38 photos
Canadian St. John's wort (Hypericum canadense) – 6 photos
common St. John's wort (Hypericum perforatum) – 45 photos
creeping St. John's wort (Hypericum anagalloides) – 38 photos
dwarf St. John's wort (Hypericum mutilum) – 17 photos
great St. John's wort (Hypericum calycinum) – 6 photos
greater Canadian St. John's wort (Hypericum majus) – 20 photos
northern St. John's wort (Hypericum boreale) – 4 photos
Norton's St. John's wort (Hypericum scouleri) – 33 photos
Scouler's St. John's wort (Hypericum scouleri) – 33 photos
square-stalked St. John's wort (Hypericum tetrapterum) – 12 photos
western St. John's wort (Hypericum scouleri) – 33 photos
Stag's-horn
stag's-horn (Xylaria hypoxylon) – 9 photos
Staggerweed
staggerweed (Stachys arvensis) – 3 photos
Staghorn
small staghorn (Calocera cornea) – 4 photos
yellow staghorn (Calocera viscosa) – 2 photos
Stagshorn
yellow stagshorn (Calocera viscosa) – 3 photos
Stain
green stain (Chlorociboria aeruginascens) – 7 photos
Stainer
formosa stainer (Ramaria maculatipes) – 2 photos
sweet formosa stainer (Ramaria rubribrunnescens) – 4 photos
Stalk
hollow stalk (Suillus cavipes) – 4 photos
Stanleya
perennial stanleya (Stanleya viridiflora) – 12 photos
Star-of-bethleham
hairy star-of-bethleham (Gagea villosa) – 2 photos
Star-of-Bethlehem
garden star-of-Bethlehem (Ornithogalum umbellatum) – 6 photos
Star-thistle
Iberian star-thistle (Centaurea iberica) – 1 photo
Maltese star-thistle (Centaurea melitensis) – 9 photos
montane star-thistle (Centaurea montana) – 21 photos
purple star-thistle (Centaurea calcitrapa) – 3 photos
red star-thistle (Centaurea calcitrapa) – 3 photos
yellow star-thistle (Centaurea solstitialis) – 26 photos
Star-tulip
green-banded star-tulip (Calochortus macrocarpus) – 53 photos
Starflower
arctic starflower (Lysimachia europaea) – 32 photos
broad-leaved starflower (Lysimachia latifolia) – 27 photos
northern starflower (Lysimachia europaea) – 32 photos
western starflower (Lysimachia latifolia) – 27 photos
Stargrass
water stargrass (Heteranthera dubia) – 31 photos
yellow stargrass (Heteranthera dubia) – 31 photos
Starwort
blunt-sepaled starwort (Engellaria obtusa) – 19 photos
boreal starwort (Stellaria borealis) – 3 photos
crisped starwort (Stellaria crispa) – 14 photos
Goldie's starwort (Stellaria longipes ssp. longipes) – 19 photos
grass-leaf starwort (Stellaria graminea) – 14 photos
long-leaved starwort (Stellaria longifolia) – 20 photos
longstalk starwort (Stellaria longipes) – 11 photos
northern bog starwort (Stellaria calycantha) – 17 photos
saltmarsh starwort (Stellaria humifusa) – 3 photos
shiny starwort (Stellaria nitens) – 23 photos
Sitka starwort (Stellaria sitchana) – 15 photos
sticky starwort (Pseudostellaria jamesiana) – 30 photos
umbrella starwort (Stellaria umbellata) – 2 photos
Steeplebush
hardhack steeplebush (Spiraea douglasii) – 27 photos
Steer's-head
long-horn steer's-head (Dicentra uniflora) – 71 photos
Steinpilz
Stenotus
woolly stenotus (Stenotus lanuginosus var. lanuginosus) – 23 photos
Stephanomeria
narrowleaf stephanomeria (Stephanomeria tenuifolia) – 42 photos
stiff-branched stephanomeria (Stephanomeria paniculata) – 9 photos
Stereum
hairy Stereum (Stereum hirsutum) – 14 photos
stalked Stereum (Cotylidia diaphana) – 1 photo
Stichwort
brittle stichwort (Sabulina nuttallii var. fragilis) – 8 photos
Stickseed
blue stickseed (Hackelia micrantha) – 92 photos
bristly stickseed (Lappula squarrosa) – 21 photos
common stickseed (Lappula squarrosa) – 21 photos
Cotton's stickseed (Hackelia diffusa var. cottonii) – 5 photos
cupped stickseed (Lappula redowskii var. cupulata) – 8 photos
diffuse stickseed (Hackelia diffusa) – 19 photos
diffuse stickseed (Hackelia diffusa var. diffusa) – 13 photos
European stickseed (Lappula squarrosa) – 21 photos
gray stickseed (Hackelia cinerea) – 19 photos
hispid stickseed (Hackelia hispida) – 3 photos
lesser showy stickseed (Hackelia venusta) – 33 photos
many-flowered stickseed (Hackelia floribunda) – 19 photos
nodding stickseed (Hackelia americana) – 3 photos
Okanogan stickseed (Hackelia ciliata) – 14 photos
rough stickseed (Hackelia hispida) – 3 photos
rough stickseed (Hackelia hispida var. hispida) – 17 photos
sagebrush stickseed (Hackelia diffusa var. arida) – 30 photos
sagebrush stickseed (Hackelia hispida var. disjuncta) – 12 photos
showy stickseed (Hackelia venusta) – 33 photos
steppe stickseed (Hackelia diffusa var. arida) – 30 photos
Taylor's stickseed (Hackelia taylorii) – 5 photos
western stickseed (Lappula redowskii var. redowskii) – 14 photos
Sticktight
sticktight (Bidens frondosa) – 27 photos
western sticktight (Bidens vulgata) – 21 photos
Sticky-laurel
sticky-laurel (Ceanothus velutinus) – 14 photos
sticky-laurel (Ceanothus velutinus var. laevigatus) – 8 photos
Sticky-willy
sticky-willy (Galium aparine) – 53 photos
Stiltball
sandy stiltball (Battarrea phalloides) – 2 photos
Stinker
the stinker (Tricholoma sulphureum) – 3 photos
Stinkgrass
stinkgrass (Eragrostis cilianensis) – 31 photos
Stinkhorn
dog stinkhorn (Mutinus caninus) – 4 photos
dog's stinkhorn (Mutinus caninus) – 4 photos
Stinkweed
Stinky-Bob
stinky-Bob (Geranium robertianum) – 37 photos
Stitchwort
bog stitchwort (Stellaria alsine) – 2 photos
boreal stitchwort (Sabulina rubella) – 43 photos
boreal stitchwort (Stellaria borealis) – 3 photos
dwarf stitchwort (Sabulina pusilla) – 3 photos
slender stitchwort (Sabulina macra) – 16 photos
Stock
hoary stock (Matthiola incana) – 10 photos
Stonecrop
broadleaf stonecrop (Sedum spathulifolium) – 52 photos
Forster's stonecrop (Sedum forsterianum) – 6 photos
lance-leaved stonecrop (Sedum lanceolatum) – 85 photos
lance-leaved stonecrop (Sedum rupicola) – 14 photos
Leiberg's stonecrop (Sedum leibergii) – 33 photos
mossy stonecrop (Crassula tillaea) – 12 photos
mossy stonecrop (Sedum acre) – 9 photos
Oregon stonecrop (Sedum oreganum) – 24 photos
Pacific stonecrop (Sedum divergens) – 44 photos
spatula-leaf stonecrop (Sedum spathulifolium) – 52 photos
spreading stonecrop (Sedum divergens) – 44 photos
Thart's stonecrop (Sedum thartii) – 10 photos
white stonecrop (Sedum album) – 13 photos
wormleaf stonecrop (Sedum stenopetalum) – 26 photos
wormleaf stonecrop (Sedum stenopetalum ssp. stenopetalum) – 50 photos
Stoneseed
fringed stoneseed (Lithospermum incisum) – 1 photo
Stool
fairy stool (Coltricia cinnamomea) – 1 photo
Stork's-bill
common stork's-bill (Erodium cicutarium) – 52 photos
longbeak stork's-bill (Erodium botrys) – 11 photos
redstem stork's-bill (Erodium cicutarium ssp. cicutarium) – 2 photos
Stranvaesia
stranvaesia (Photinia davidiana var. davidiana) – 1 photo
Strapwort
Strawberries-and-cream
strawberries-and-cream (Hydnellum peckii) – 13 photos
Strawberry
beach strawberry (Fragaria chiloensis) – 17 photos
beach strawberry (Fragaria chiloensis ssp. pacifica) – 6 photos
blueleaf strawberry (Fragaria virginiana) – 29 photos
blueleaf strawberry (Fragaria virginiana ssp. glauca) – 31 photos
broadpetal strawberry (Fragaria virginiana ssp. glauca) – 62 photos
coastal strawberry (Fragaria chiloensis) – 17 photos
coastal strawberry (Fragaria chiloensis ssp. pacifica) – 6 photos
mountain strawberry (Fragaria virginiana) – 29 photos
strawberry (Fragaria) – 1 photo
wild strawberry (Fragaria virginiana ssp. glauca) – 31 photos
woodland strawberry (Fragaria vesca) – 24 photos
woodland strawberry (Fragaria vesca ssp. californica) – 28 photos
Strawberry-blight
strawberry-blight (Blitum hastatum) – 4 photos
Streaks
silver streaks (Tricholoma virgatum) – 3 photos
Streptanthella
streptanthella (Streptanthella longirostris) – 21 photos
Stropharia
blue-green Stropharia (Stropharia aeruginosa) – 5 photos
king Stropharia (Stropharia rugosoannulata) – 3 photos
lacerated Stropharia (Stropharia hornemannii) – 6 photos
questionable Stropharia (Stropharia ambigua) – 12 photos
umbonate dung-dwelling Stropharia (Stropharia umbonatescens) – 1 photo
wine-cap Stropharia (Stropharia rugosoannulata) – 3 photos
wine-red Stropharia (Stropharia rugosoannulata) – 3 photos
Stubby-stalk
stubby-stalk (Suillus brevipes) – 5 photos
Succory
gum succory (Chondrilla juncea) – 32 photos
wild succory (Cichorium intybus) – 42 photos
Sugarbowls
sugarbowls (Clematis hirsutissima) – 12 photos
Sugarstick
sugarstick (Allotropa virgata) – 63 photos
Suillus
blue-staining Suillus (Suillus caerulescens) – 5 photos
chicken-fat Suillus (Suillus americanus) – 3 photos
dotted-stalk Suillus (Suillus granulatus) – 2 photos
Douglas-fir Suillus (Suillus caerulescens) – 5 photos
hollow-stalked larch Suillus (Suillus cavipes) – 4 photos
larch Suillus (Suillus grevillei) – 6 photos
olive-capped Suillus (Suillus subolivaceus) – 2 photos
short-stalked Suillus (Suillus brevipes) – 5 photos
tomentose Suillus (Suillus tomentosus) – 4 photos
western painted Suillus (Suillus lakei) – 4 photos
woolly-capped Suillus (Suillus tomentosus) – 4 photos
Sulfur flower
Haussknecht's sulfur flower (Eriogonum umbellatum var. haussknechtii) – 11 photos
Kittitas sulfur flower (Eriogonum umbellatum var. hypoleium) – 20 photos
Sandberg's sulfur flower (Eriogonum umbellatum var. sandbergii) – 4 photos
starry sulfur flower (Eriogonum umbellatum var. ellipticum) – 37 photos
subalpine sulfur flower (Eriogonum umbellatum var. majus) – 22 photos
Sulfurflower
sulfurflower (Eriogonum umbellatum) – 24 photos
Sulphur lichen
bracted sulphur lichen (Gyalolechia bracteata) – 3 photos
Sumac
lemonade sumac (Rhus aromatica) – 8 photos
smooth sumac (Rhus aromatica) – 8 photos
smooth sumac (Rhus glabra) – 51 photos
staghorn sumac (Rhus typhina) – 9 photos
Suncup
blackfoot river suncup (Neoholmgrenia andina) – 96 photos
contorted pod suncup (Camissonia contorta) – 31 photos
dwarf suncup (Eremothera pygmaea) – 44 photos
green river suncup (Eremothera minor) – 38 photos
Hilgard's suncup (Neoholmgrenia hilgardii) – 92 photos
Lewis river suncup (Camissonia parvula) – 16 photos
little suncup (Camissonia pusilla) – 14 photos
obscure suncup (Neoholmgrenia andina) – 96 photos
twisted suncup (Camissonia contorta) – 31 photos
Sundew
English sundew (Drosera anglica) – 37 photos
giant sundew (Drosera anglica) – 37 photos
round-leaf sundew (Drosera rotundifolia) – 44 photos
Sunflower
common sunflower (Helianthus annuus) – 57 photos
cordilleran sunflower (Helianthus nuttallii ssp. nuttallii) – 1 photo
Cusick's sunflower (Helianthus cusickii) – 29 photos
false sunflower (Helianthella uniflora var. douglasii) – 58 photos
narrow leaved sunflower (Helianthus maximiliani) – 4 photos
Nuttall's sunflower (Helianthus nuttallii ssp. nuttallii) – 1 photo
prairie sunflower (Helianthus petiolaris) – 9 photos
smooth dwarf sunflower (Wyethia amplexicaulis) – 42 photos
turniproot sunflower (Helianthus cusickii) – 29 photos
Sunshine
Oregon sunshine (Eriophyllum lanatum) – 39 photos
Oregon sunshine (Eriophyllum lanatum var. integrifolium) – 31 photos
Surf-grass
Scouler's surf-grass (Phyllospadix scouleri) – 13 photos
toothed surf-grass (Phyllospadix serrulatus) – 2 photos
Torrey's surf-grass (Phyllospadix torreyi) – 4 photos
Swainsonpea
alkali swainsonpea (Sphaerophysa salsula) – 24 photos
Swamp laurel
Western swamp laurel (Kalmia microphylla var. occidentalis) – 19 photos
Swampcandles
swampcandles (Lysimachia terrestris) – 13 photos
Sweet-cicely
blunt-fruit sweet-cicely (Osmorhiza depauperata) – 2 photos
mountain sweet-cicely (Osmorhiza berteroi) – 42 photos
purple sweet-cicely (Osmorhiza purpurea) – 34 photos
Sierran sweet-cicely (Osmorhiza occidentalis) – 58 photos
western sweet-cicely (Osmorhiza occidentalis) – 58 photos
Sweet-clover
annual yellow sweet-clover (Melilotus indicus) – 9 photos
small-flowered yellow sweet-clover (Melilotus indicus) – 9 photos
white sweet-clover (Melilotus albus) – 33 photos
yellow sweet-clover (Melilotus officinalis) – 31 photos
Sweet-vetch
western sweet-vetch (Hedysarum occidentale) – 19 photos
western sweet-vetch (Hedysarum occidentale var. occidentale) – 6 photos
yellow sweet-vetch (Hedysarum sulphurescens) – 9 photos
Sweetbrier
small-flowered sweetbrier (Rosa rubiginosa) – 25 photos
Sweetflag
American sweetflag (Acorus americanus) – 1 photo
several-vein sweetflag (Acorus americanus) – 1 photo
Sweetgale
Sweetgrass
hairy sweetgrass (Hierochloe odorata) – 19 photos
Swertia
alpine bog swertia (Swertia perennis) – 3 photos
Swinecress
lesser swinecress (Lepidium didymum) – 14 photos
Sword-fern
Anderson's sword-fern (Polystichum andersonii) – 15 photos
California sword-fern (Polystichum californicum) – 6 photos
imbricate sword-fern (Polystichum imbricans) – 7 photos
rock sword-fern (Polystichum imbricans) – 7 photos
Sycamore
Synthyris
round-leaved synthyris (Veronica regina-nivalis) – 21 photos
