The Washington Flora Checklist aims to be a complete list of the native and naturalized vascular plants of Washington State, with current classifications, nomenclature and synonymy. The checklist currently contains 3,702 accepted terminal taxa, of which 2,654 are native.

Taxa included in the checklist:

  • Native taxa whether extant, extirpated, or extinct.
  • Exotic taxa that are naturalized, escaped from cultivation, or persisting wild.
  • Waifs (e.g., ballast plants, escaped crop plants) and other scarcely collected exotics.
  • Interspecific hybrids that are frequent or self-maintaining.
  • Some unnamed taxa in the process of being described.

Fred Weinmann initiated development of the checklist in 1998, and with the help of Peter Zika and others a draft checklist was completed by 2002. In 2007 the checklist was transferred to the UW Herbarium, funded by grants from the Bureau of Land Management and the Washington Native Plant Society. In 2018 the checklist underwent a major update to align nomenclature with the 2nd Edition of the Flora of the Pacific Northwest and integrate the checklist with the Burke Herbarium Image Collection and the Consortium of Pacific Northwest Herbaria database to provide unified nomenclatural management across the Herbarium's online resources; funding was provided by the Washington State Department of Agriculture.

Family classifications follow APG IV for angiosperms, PPG I (J. Syst. Evol. 54:563–603. 2016) for pteridophytes, and Christenhusz et al. (Phytotaxa 19:55–70. 2011) for gymnosperms, with a few exceptions. Nomenclature and synonymy at the rank of genus and below follows the 2nd Edition of the Flora of the Pacific Northwest except where superceded by new information.

Please note: This is a working checklist, continuously updated. Use it at your discretion.

Last updates made on 4/7/2024.

Ferns and Lycophytes:
Family
Common Names
# of Taxa
Download
Spleenwort Family
3 taxa;
download: txt, pdf
Lady Fern Family
2 taxa;
download: txt, pdf
Azollaceae (see Salviniaceae)
 
 
Chain Fern Family, Deer Fern Family
2 taxa;
download: txt, pdf
Fragile Fern Family
4 taxa;
download: txt, pdf
Bracken Fern Family
1 taxon;
download: txt, pdf
Wood Fern Family
19 taxa;
download: txt, pdf
Horsetail Family
13 taxa;
download: txt, pdf
Grammitidaceae (see Polypodiaceae)
 
 
Filmy fern family
1 taxon;
download: txt, pdf
Quillwort Family
8 taxa;
download: txt, pdf
12 taxa;
download: txt, pdf
Pepperwort Family, Water-Clover Family
4 taxa;
download: txt, pdf
Adder's-Tongue Family
19 taxa;
download: txt, pdf
0 taxa;
download: txt, pdf
Parkeriaceae (see Pteridaceae)
 
 
Polypody Fern Family
4 taxa;
download: txt, pdf
Maidenhair Fern Family
13 taxa;
download: txt, pdf
Floating-Fern Family
2 taxa;
download: txt, pdf
Spike-Moss Family
4 taxa;
download: txt, pdf
Maiden Fern Family
3 taxa;
download: txt, pdf
Vittariaceae (see Pteridaceae)
 
 
Cliff Fern Family
3 taxa;
download: txt, pdf
Gymnosperms:
Family
Common Names
# of Taxa
Download
Cypress Family
7 taxa;
download: txt, pdf
Pine Family
21 taxa;
download: txt, pdf
Yew Family
2 taxa;
download: txt, pdf
Dicots:
Family
Common Names
# of Taxa
Download
Aceraceae (see Sapindaceae)
 
 
Muskroot Family
10 taxa;
download: txt, pdf
Amaranth Family
65 taxa;
download: txt, pdf
Sumac Family
4 taxa;
download: txt, pdf
Carrot Family
92 taxa;
download: txt, pdf
Dogbane Family
9 taxa;
download: txt, pdf
Holly Family
1 taxon;
download: txt, pdf
Ginseng Family
6 taxa;
download: txt, pdf
Birthwort Family
1 taxon;
download: txt, pdf
Asclepiadaceae (see Apocynaceae)
 
 
Aster Family
463 taxa;
download: txt, pdf
Touch-Me-Not Family
7 taxa;
download: txt, pdf
Barberry Family
10 taxa;
download: txt, pdf
Birch Family
17 taxa;
download: txt, pdf
Trumpet Creeper Family
2 taxa;
download: txt, pdf
Borage Family
83 taxa;
download: txt, pdf
 
 
Mustard Family
170 taxa;
download: txt, pdf
Buddlejaceae (see Scrophulariaceae)
 
 
Watershield Family
2 taxa;
download: txt, pdf
Cactus Family
4 taxa;
download: txt, pdf
Callitrichaceae (see Plantaginaceae)
 
 
Bellflower Family
21 taxa;
download: txt, pdf
Hemp Family
3 taxa;
download: txt, pdf
Honeysuckle Family
17 taxa;
download: txt, pdf
 
 
Pink Family
104 taxa;
download: txt, pdf
Bittersweet Family
9 taxa;
download: txt, pdf
Hornwort Family
2 taxa;
download: txt, pdf
Chenopodiaceae (see Amaranthaceae)
 
 
Spiderflower Family
2 taxa;
download: txt, pdf
Comandraceae (see Santalaceae)
 
 
Compositae (see Asteraceae)
 
 
Morning-Glory Family
16 taxa;
download: txt, pdf
Dogwood Family
5 taxa;
download: txt, pdf
Stonecrop Family
16 taxa;
download: txt, pdf
Rockflower Family
1 taxon;
download: txt, pdf
Cruciferae (see Brassicaceae)
 
 
Cucumber Family
3 taxa;
download: txt, pdf
Cuscutaceae (see Convolvulaceae)
 
 
Teasel Family
1 taxon;
download: txt, pdf
Sundew Family
4 taxa;
download: txt, pdf
Ehretia Family
1 taxon;
download: txt, pdf
Oleaster Family
4 taxa;
download: txt, pdf
Waterwort Family
3 taxa;
download: txt, pdf
Empetraceae (see Ericaceae)
 
 
Heath Family
63 taxa;
download: txt, pdf
Spurge Family
14 taxa;
download: txt, pdf
Pea Family
213 taxa;
download: txt, pdf
Beech Family
5 taxa;
download: txt, pdf
Fumariaceae (see Papaveraceae)
 
 
Silktassel Family
1 taxon;
download: txt, pdf
Gentian Family
16 taxa;
download: txt, pdf
Geranium Family
18 taxa;
download: txt, pdf
Currant Family
23 taxa;
download: txt, pdf
Water Milfoil Family
10 taxa;
download: txt, pdf
Haloragidaceae (see Haloragaceae)
 
 
Heliotrope Family
1 taxon;
download: txt, pdf
Hippocastanaceae (see Sapindaceae)
 
 
Hippuridaceae (see Plantaginaceae)
 
 
Hydrangea Family
2 taxa;
download: txt, pdf
Waterleaf Family
31 taxa;
download: txt, pdf
(see also Namaceae)
 
 
St. John's Wort Family
13 taxa;
download: txt, pdf
Walnut Family
4 taxa;
download: txt, pdf
Labiatae (see Lamiaceae)
 
 
Mint Family
54 taxa;
download: txt, pdf
Laurel Family
1 taxon;
download: txt, pdf
Leguminosae (see Fabaceae)
 
 
Leitneriaceae (see Simaroubaceae)
 
 
Bladderwort Family
7 taxa;
download: txt, pdf
Meadowfoam Family
3 taxa;
download: txt, pdf
Flax Family
4 taxa;
download: txt, pdf
False Pimpernel Family
1 taxon;
download: txt, pdf
Twin Flower Family
1 taxon;
download: txt, pdf
Blazingstar Family
5 taxa;
download: txt, pdf
Loosestrife Family
6 taxa;
download: txt, pdf
Mallow Family
19 taxa;
download: txt, pdf
Mazus Family
1 taxon;
download: txt, pdf
Buck-Bean Family
3 taxa;
download: txt, pdf
Carpetweed Family
1 taxon;
download: txt, pdf
Monotropaceae (see Ericaceae)
 
 
Miner's Lettuce Family
33 taxa;
download: txt, pdf
Mulberry Family
2 taxa;
download: txt, pdf
Bayberry Family
2 taxa;
download: txt, pdf
Myrsinaceae (see Primulaceae)
 
 
Nama Family
1 taxon;
download: txt, pdf
Harmal Family
1 taxon;
download: txt, pdf
Four-O'clock Family
4 taxa;
download: txt, pdf
Water-Lily Family
3 taxa;
download: txt, pdf
(see also Cabombaceae)
 
 
Olive Family
5 taxa;
download: txt, pdf
Evening-Primrose Family
63 taxa;
download: txt, pdf
Broom-Rape Family
60 taxa;
download: txt, pdf
Wood-Sorrel Family
6 taxa;
download: txt, pdf
Peony Family
1 taxon;
download: txt, pdf
Poppy Family
17 taxa;
download: txt, pdf
Parnassiaceae (see Celastraceae)
 
 
Princess Tree Family
1 taxon;
download: txt, pdf
Penthorum Family
1 taxon;
download: txt, pdf
Lopseed Family
29 taxa;
download: txt, pdf
Pokeweed Family
1 taxon;
download: txt, pdf
Plantain Family
109 taxa;
download: txt, pdf
Plane-Tree Family, Sycamore Family
2 taxa;
download: txt, pdf
Leadwort Family, Plumbago Family
4 taxa;
download: txt, pdf
Phlox Family
56 taxa;
download: txt, pdf
Milkwort Family
1 taxon;
download: txt, pdf
Buckwheat Family
95 taxa;
download: txt, pdf
Purslane Family
1 taxon;
download: txt, pdf
(see also Montiaceae)
 
 
Primrose Family
29 taxa;
download: txt, pdf
Pyrolaceae (see Ericaceae)
 
 
Buttercup Family
106 taxa;
download: txt, pdf
Mignonette Family
2 taxa;
download: txt, pdf
Buckthorn Family
9 taxa;
download: txt, pdf
Rose Family
169 taxa;
download: txt, pdf
Madder Family
17 taxa;
download: txt, pdf
Willow Family
44 taxa;
download: txt, pdf
Sandalwood Family
10 taxa;
download: txt, pdf
Soapberry Family
9 taxa;
download: txt, pdf
Greasewood Family
1 taxon;
download: txt, pdf
Pitcherplant Family
4 taxa;
download: txt, pdf
Saxifrage Family
61 taxa;
download: txt, pdf
Figwort Family
8 taxa;
download: txt, pdf
Quassia-Wood Family
1 taxon;
download: txt, pdf
Potato Family
18 taxa;
download: txt, pdf
Tamarisk Family
3 taxa;
download: txt, pdf
Theophrastaceae (see Primulaceae)
 
 
Mezereum Family
3 taxa;
download: txt, pdf
Elm Family
4 taxa;
download: txt, pdf
Umbelliferae (see Apiaceae)
 
 
Nettle Family
6 taxa;
download: txt, pdf
Valerian Family
12 taxa;
download: txt, pdf
Verbena Family
5 taxa;
download: txt, pdf
Violet Family
26 taxa;
download: txt, pdf
Viscaceae (see Santalaceae)
 
 
Grape Family
4 taxa;
download: txt, pdf
Creosote-Bush Family
2 taxa;
download: txt, pdf
Monocots:
Family
Common Names
# of Taxa
Download
Sweet Flag Family
1 taxon;
download: txt, pdf
Agavaceae (see Asparagaceae)
 
 
Water-Plantain Family
9 taxa;
download: txt, pdf
Amaryllis Family
26 taxa;
download: txt, pdf
Arum Family
12 taxa;
download: txt, pdf
(see also Acoraceae)
 
 
Asparagus Family
21 taxa;
download: txt, pdf
Flowering Rush Family
1 taxon;
download: txt, pdf
Spiderwort Family
1 taxon;
download: txt, pdf
Sedge Family
205 taxa;
download: txt, pdf
Gramineae (see Poaceae)
 
 
Frogbit Family, Tapegrass Family, Waterweed Family
10 taxa;
download: txt, pdf
Iris Family
18 taxa;
download: txt, pdf
Rush Family
69 taxa;
download: txt, pdf
Arrow-grass Family
5 taxa;
download: txt, pdf
(see also Scheuchzeriaceae)
 
 
Lemnaceae (see Araceae)
 
 
Lilaeaceae (see Juncaginaceae)
 
 
Lily Family
29 taxa;
download: txt, pdf
Limnocharitaceae (see Alismataceae)
 
 
False-Hellebore Family
14 taxa;
download: txt, pdf
Najadaceae (see Hydrocharitaceae)
 
 
Orchid Family
43 taxa;
download: txt, pdf
Grass Family
332 taxa;
download: txt, pdf
Pickerelweed Family
3 taxa;
download: txt, pdf
Pondweed Family
22 taxa;
download: txt, pdf
(see also Ruppiaceae)
 
 
Ditch-Grass Family
1 taxon;
download: txt, pdf
Rannoch-rush Family, Scheuchzeria Family
1 taxon;
download: txt, pdf
(see also Juncaginaceae)
 
 
Sparganiaceae (see Typhaceae)
 
 
False-Asphodel Family
1 taxon;
download: txt, pdf
Cat-Tail Family
9 taxa;
download: txt, pdf
Vallisneriaceae (see Hydrocharitaceae)
 
 
Zannichelliaceae (see Potamogetonaceae)
 
 
Eel-Grass Family
5 taxa;
download: txt, pdf