| Scientific Name (* Introduced) |
Family | Common Name | Habitat | Bloom Period |
| Angelica genuflexa | Apiaceae | kneeling angelica | freshwater | jul, aug |
| Athysanus pusillus | Brassicaceae | common sandweed | eastern forest, prairie or bald, shrub-steppe | mar, apr, may, jun |
| Azolla filiculoides | Salviniaceae | Pacific mosquito-fern, duckweed fern, large mosquito-fern | freshwater | jul, aug, sep |
| Azolla microphylla | Salviniaceae | |||
| Balsamorhiza deltoidea | Asteraceae | deltoid balsamroot, Puget balsamroot | western forest, eastern forest | mar, apr, may, jun, jul |
| Berula incisa | Apiaceae | |||
| Buddleja davidii * | Scrophulariaceae | orange-eye butterfly-bush | western forest, disturbed areas | mar, apr, may, jun, jul, aug, sep, oct |
| Calamagrostis canadensis var. canadensis | Poaceae | bluejoint reedgrass | jun, jul, aug | |
| Castilleja miniata | Orobanchaceae | scarlet Indian paintbrush | western forest, eastern forest, subalpine or alpine, saltwater shores | may, jun, jul, aug, sep |
| Castilleja miniata var. dixonii | Orobanchaceae | scarlet paintbrush | saltwater shores | may, jun, jul, aug |
| Catalpa speciosa * | Bignoniaceae | |||
| Centaurea melitensis * | Asteraceae | Maltese star-thistle, tocalote | western forest, eastern forest, prairie or bald, disturbed areas | jun, jul, aug, sep |
| Ceratophyllum echinatum | Ceratophyllaceae | spineless hornwort | freshwater | |
| Chenopodium album * | Amaranthaceae | lambsquarters | disturbed areas | jun, jul, aug, sep |
| Cirsium edule var. edule | Asteraceae | Indian thistle, edible thistle | ||
| Cuscuta pacifica var. pacifica | Convolvulaceae | |||
| Dichelostemma congestum | Asparagaceae | ookow, northern saitas | shrub-steppe | may, jun |
| Empetrum nigrum | Ericaceae | black crowberry | subalpine or alpine, freshwater | may, jun, jul |
| Erigeron speciosus | Asteraceae | aspen fleabane, splendid fleabane | western forest, eastern forest, prairie or bald | jun, jul, aug |
| Erythranthe dentata | Phrymaceae | coastal monkey-flower, tooth-leaved mimulus | freshwater | may, jun, jul, aug, sep |
| Erythranthe grandis | Phrymaceae | |||
| Euphorbia maculata * | Euphorbiaceae | spotted spurge, milk spurge, sandmat | western forest, eastern forest, shrub-steppe, disturbed areas | jun, jul, aug, sep |
| Fragaria ananassa ssp. cuneifolia | Rosaceae | |||
| Fritillaria camschatcensis | Liliaceae | Kamchatka fritillary, indian rice-root, black lily | western forest, freshwater | may, jun, jul |
| Geum triflorum | Rosaceae | old man's whiskers | eastern forest, prairie or bald, shrub-steppe, subalpine or alpine | apr, may, jun, jul, aug |
| Glehnia leiocarpa | Apiaceae | |||
| Glyceria elata | Poaceae | tall mannagrass | freshwater | jun, jul, aug |
| Hemitomes congestum | Ericaceae | coneplant, gnome-plant | western forest | jun, jul, aug |
| Heterotheca villosa | Asteraceae | hairy false goldenaster, leafy goldenaster | eastern forest, shrub-steppe | jun, jul, aug, sep |
| Heterotheca villosa var. villosa | Asteraceae | Hairy goldaster | jun, jul, aug, sep | |
| Hieracium scouleri | Asteraceae | Scouler's woollyweed, Scouler's hawkweed, hound tongue hawkweed | western forest, eastern forest | jun, jul, aug |
| Iris missouriensis | Iridaceae | Rocky Mountain iris, western blue flag | freshwater | may, jun, jul |
| Isolepis cernua | Cyperaceae | low bulrush, tufted clubrush | saltwater shores | jun, jul, aug |
| Lathyrus littoralis | Fabaceae | silky beach pea, beach peavine, silky beach vetchling | saltwater shores | may, jun, jul |
| Lithospermum ruderale | Boraginaceae | western stoneseed, Columbian puccoon, western gromwell | eastern forest, shrub-steppe | apr, may, jun |
| Lonicera involucrata var. involucrata | Caprifoliaceae | Bearberry honeysuckle, black twin-berry | apr, may, jun, jul, aug | |
| Lysimachia maritima | Primulaceae | sea milkwort | shrub-steppe, saltwater shores | apr, may, jun |
| Lythrum salicaria * | Lythraceae | purple loosestrife, long purples, | freshwater | jul, aug, sep |
| Malva moschata * | Malvaceae | musk mallow | disturbed areas | may, jun, jul |
| Meconella oregana | Papaveraceae | white fairypoppy, white fairy-poppy | prairie or bald | mar, apr |
| Nepeta cataria * | Lamiaceae | catnip | freshwater, disturbed areas | jun, jul, aug, sep |
| Oenothera biennis * | Onagraceae | common evening-primrose, king's-cureall | freshwater, disturbed areas | jun, jul, aug |
| Parapholis incurva * | Poaceae | |||
| Pascopyrum smithii | Poaceae | western wheatgrass | ||
| Phragmites australis | Poaceae | common reed | freshwater, disturbed areas | jul, aug, sep |
| Plantago coronopus * | Plantaginaceae | buck-horn plantain | saltwater shores, disturbed areas | may, jun, jul, aug, sep, oct |
| Plectritis brachystemon | Valerianaceae | shortspur sea blush | western forest, prairie or bald | apr, may, jun |
| Poa macrantha | Poaceae | seashore bluegrass, sand-dune bluegrass | saltwater shores | apr, may, jun, jul |
| Polygonum paronychia | Polygonaceae | beach knotweed, black knotweed | saltwater shores | may, jun, jul, aug, sep |
| Potamogeton richardsonii | Potamogetonaceae | Richardson's pondweed, clasping-leaved pondweed | freshwater | jun, jul, aug |
| Ranunculus flammula var. flammula | Ranunculaceae | creeping spearwort | ||
| Ranunculus sceleratus var. sceleratus * | Ranunculaceae | Celeryleaved buttercup. blister buttercup | may, jun, jul, aug, sep | |
| Raphanus sativus * | Brassicaceae | cultivated radish, garden radish | disturbed areas | may, jun, jul |
| Rhinanthus minor ssp. minor * | Orobanchaceae | western forest, eastern forest, prairie or bald, subalpine or alpine, disturbed areas | ||
| Rhododendron macrophyllum | Ericaceae | Pacific rhododendron, California rhododendron | western forest | may, jun, jul |
| Rosa pisocarpa | Rosaceae | clustered rose | western forest, freshwater | may, jun, jul |
| Sericocarpus rigidus | Asteraceae | Columbian white-topped aster, rigid white-topped aster | western forest, prairie or bald | jul, aug |
| Silene noctiflora * | Caryophyllaceae | nightflowering silene, night-flowering catchfly | disturbed areas | jun, jul, aug |
| Solanum rostratum * | Solanaceae | buffalobur nightshade, buffalo bur, horned nightshade | disturbed areas | jun, jul, aug, sep |
| Spartina anglica * | Poaceae | common cordgrass | saltwater shores | |
| Spartina densiflora * | Poaceae | denseflower cordgrass | saltwater shores | |
| Spergularia bocconei * | Caryophyllaceae | |||
| Streptopus amplexifolius | Liliaceae | clasp-leaf twisted-stalk, clasping twisted-stalk | western forest, eastern forest, subalpine or alpine, freshwater | may |
| Trifolium glomeratum * | Fabaceae | clustered clover | ||
| Trifolium suffocatum * | Fabaceae | Suffocated clover | ||
| Vaccinium ovatum | Ericaceae | California huckleberry, evergreen huckleberry | western forest | apr, may, jun, jul, aug |
| Veronica hederifolia * | Plantaginaceae | ivy-leaf speedwell | disturbed areas | apr, may, jun |
| Viburnum tinus * | Adoxaceae | |||
| Vicia villosa var. villosa * | Fabaceae |
Data from Consortium of PNW Herbaria and Burke Herbarium Image Collection. Generated on January 24, 2022
More information on the PlantQuest Image Project can be found at https://biology.burke.washington.edu/herbarium/imagecollection/plantquest.php.