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 3,935 terminal taxa (species, subspecies, and varieties).

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and synonymy at the rank of genus and below follows the 2nd Edition of the Flora of the Pacific Northwest except where superceded by new information.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 11/17/2018.

Ferns and Lycophytes:
Family
Common Names
# of Taxa
Last Updated
Download
Spleenwort Family
4 taxa;
last updated 10/21/2003
download: txt, pdf
Lady Fern Family
2 taxa;
last updated 8/15/2018
download: txt, pdf
Azollaceae (see Salviniaceae)
 
 
 
Chain Fern Family, Deer Fern Family
2 taxa;
last updated 10/21/2003
download: txt, pdf
Fragile Fern Family
4 taxa;
last updated 8/15/2018
download: txt, pdf
Bracken Fern Family
1 taxon;
last updated 10/21/2003
download: txt, pdf
Wood Fern Family
18 taxa;
last updated 10/21/2003
download: txt, pdf
Horsetail Family
15 taxa;
last updated 12/22/2008
download: txt, pdf
Grammitidaceae (see Polypodiaceae)
 
 
 
Filmy fern family
1 taxon;
last updated 10/21/2015
download: txt, pdf
Quillwort Family
8 taxa;
last updated 10/21/2003
download: txt, pdf
Club-Moss Family
12 taxa;
last updated 10/21/2003
download: txt, pdf
Pepperwort Family, Water-Clover Family
4 taxa;
last updated 3/5/2009
download: txt, pdf
Adder's-Tongue Family
18 taxa;
last updated 10/21/2003
download: txt, pdf
1 taxon;
last updated 8/15/2018
download: txt, pdf
Parkeriaceae (see Pteridaceae)
 
 
 
Polypody Fern Family
4 taxa;
last updated 10/21/2003
download: txt, pdf
Maidenhair Fern Family
13 taxa;
last updated 12/28/2008
download: txt, pdf
Floating-Fern Family
2 taxa;
last updated 9/4/2012
download: txt, pdf
Spike-Moss Family
4 taxa;
last updated 10/21/2003
download: txt, pdf
Maiden Fern Family
3 taxa;
last updated 10/21/2003
download: txt, pdf
Vittariaceae (see Pteridaceae)
 
 
 
Cliff Fern Family
3 taxa;
last updated 8/15/2018
download: txt, pdf
Gymnosperms:
Family
Common Names
# of Taxa
Last Updated
Download
Cypress Family
9 taxa;
last updated 10/21/2003
download: txt, pdf
Pine Family
23 taxa;
last updated 10/21/2003
download: txt, pdf
Yew Family
2 taxa;
last updated 10/21/2003
download: txt, pdf
Dicots:
Family
Common Names
# of Taxa
Last Updated
Download
Aceraceae (see Sapindaceae)
 
 
 
Muskroot Family
10 taxa;
last updated 8/8/2012
download: txt, pdf
Amaranth Family
76 taxa;
last updated 9/4/2012
download: txt, pdf
Sumac Family
4 taxa;
last updated 10/21/2003
download: txt, pdf
Carrot Family
99 taxa;
last updated 10/21/2003
download: txt, pdf
Dogbane Family
9 taxa;
last updated 10/21/2003
download: txt, pdf
Holly Family
1 taxon;
last updated 10/21/2003
download: txt, pdf
Ginseng Family
6 taxa;
last updated 10/21/2003
download: txt, pdf
Birthwort Family
1 taxon;
last updated 10/21/2003
download: txt, pdf
Asclepiadaceae (see Apocynaceae)
 
 
 
Aster Family
473 taxa;
last updated 12/5/2008
download: txt, pdf
Touch-Me-Not Family
8 taxa;
last updated 10/21/2003
download: txt, pdf
Barberry Family
10 taxa;
last updated 10/21/2003
download: txt, pdf
Birch Family
16 taxa;
last updated 10/21/2003
download: txt, pdf
Trumpet Creeper Family
2 taxa;
last updated 3/9/2011
download: txt, pdf
Borage Family
86 taxa;
last updated 2/9/2016
download: txt, pdf
 
 
 
Mustard Family
178 taxa;
last updated 12/23/2011
download: txt, pdf
Buddlejaceae (see Scrophulariaceae)
 
 
 
Watershield Family
2 taxa;
last updated 12/10/2008
download: txt, pdf
Cactus Family
3 taxa;
last updated 10/21/2003
download: txt, pdf
Callitrichaceae (see Plantaginaceae)
 
 
 
Sweetshrub Family
0 taxa;
last updated 12/29/2010
download: txt, pdf
Bellflower Family
23 taxa;
last updated 10/21/2003
download: txt, pdf
Hemp Family
4 taxa;
last updated 1/3/2014
download: txt, pdf
Honeysuckle Family
19 taxa;
last updated 10/21/2003
download: txt, pdf
 
 
 
Pink Family
107 taxa;
last updated 2/12/2013
download: txt, pdf
Bittersweet Family
9 taxa;
last updated 10/21/2003
download: txt, pdf
Hornwort Family
2 taxa;
last updated 12/15/2008
download: txt, pdf
Chenopodiaceae (see Amaranthaceae)
 
 
 
Spiderflower Family
3 taxa;
last updated 8/8/2012
download: txt, pdf
Comandraceae (see Santalaceae)
 
 
 
Compositae (see Asteraceae)
 
 
 
Morning-Glory Family
16 taxa;
last updated 2/8/2010
download: txt, pdf
Dogwood Family
5 taxa;
last updated 10/21/2003
download: txt, pdf
Stonecrop Family
16 taxa;
last updated 10/21/2003
download: txt, pdf
Rockflower Family
1 taxon;
last updated 10/21/2003
download: txt, pdf
Cruciferae (see Brassicaceae)
 
 
 
Cucumber Family
5 taxa;
last updated 10/21/2003
download: txt, pdf
Cuscutaceae (see Convolvulaceae)
 
 
 
Teasel Family
2 taxa;
last updated 10/21/2003
download: txt, pdf
Sundew Family
4 taxa;
last updated 10/21/2003
download: txt, pdf
Ehretia Family
1 taxon;
last updated 2/10/2016
download: txt, pdf
Oleaster Family
4 taxa;
last updated 10/21/2003
download: txt, pdf
Waterwort Family
3 taxa;
last updated 12/22/2008
download: txt, pdf
Empetraceae (see Ericaceae)
 
 
 
Heath Family
63 taxa;
last updated 12/15/2009
download: txt, pdf
Spurge Family
20 taxa;
last updated 10/21/2003
download: txt, pdf
Pea Family
220 taxa;
last updated 12/2/2009
download: txt, pdf
Beech Family
6 taxa;
last updated 10/21/2003
download: txt, pdf
Fumariaceae (see Papaveraceae)
 
 
 
Silktassel Family
2 taxa;
last updated 10/21/2003
download: txt, pdf
Gentian Family
16 taxa;
last updated 10/21/2003
download: txt, pdf
Geranium Family
19 taxa;
last updated 10/21/2003
download: txt, pdf
Currant Family
23 taxa;
last updated 10/27/2009
download: txt, pdf
Water Milfoil Family
10 taxa;
last updated 10/21/2003
download: txt, pdf
Haloragidaceae (see Haloragaceae)
 
 
 
Heliotrope Family
1 taxon;
last updated 2/9/2016
download: txt, pdf
Hippocastanaceae (see Sapindaceae)
 
 
 
Hippuridaceae (see Plantaginaceae)
 
 
 
Hydrangea Family
2 taxa;
last updated 10/21/2003
download: txt, pdf
Waterleaf Family
34 taxa;
last updated 2/9/2016
download: txt, pdf
(see also Namaceae)
 
 
 
St. John's Wort Family
13 taxa;
last updated 9/4/2012
download: txt, pdf
Walnut Family
4 taxa;
last updated 10/21/2003
download: txt, pdf
Labiatae (see Lamiaceae)
 
 
 
Mint Family
67 taxa;
last updated 10/21/2003
download: txt, pdf
Laurel Family
1 taxon;
last updated 3/14/2016
download: txt, pdf
Leguminosae (see Fabaceae)
 
 
 
Leitneriaceae (see Simaroubaceae)
 
 
 
Bladderwort Family
7 taxa;
last updated 10/21/2003
download: txt, pdf
Meadowfoam Family
4 taxa;
last updated 10/21/2003
download: txt, pdf
Flax Family
4 taxa;
last updated 10/21/2003
download: txt, pdf
False Pimpernel Family
1 taxon;
last updated 8/8/2012
download: txt, pdf
Twin Flower Family
1 taxon;
last updated 4/11/2013
download: txt, pdf
Blazingstar Family
5 taxa;
last updated 10/21/2003
download: txt, pdf
Loosestrife Family
6 taxa;
last updated 10/21/2003
download: txt, pdf
Mallow Family
25 taxa;
last updated 10/21/2003
download: txt, pdf
Mazus Family
1 taxon;
last updated 8/7/2012
download: txt, pdf
Buck-Bean Family
3 taxa;
last updated 10/21/2003
download: txt, pdf
Carpetweed Family
1 taxon;
last updated 10/21/2003
download: txt, pdf
Monotropaceae (see Ericaceae)
 
 
 
Miner's Lettuce Family
34 taxa;
last updated 8/7/2012
download: txt, pdf
Mulberry Family
2 taxa;
last updated 10/21/2003
download: txt, pdf
Bayberry Family
2 taxa;
last updated 10/21/2003
download: txt, pdf
Myrsinaceae (see Primulaceae)
 
 
 
Nama Family
1 taxon;
last updated 2/9/2016
download: txt, pdf
Harmal Family
1 taxon;
last updated 8/8/2011
download: txt, pdf
Four-O'clock Family
4 taxa;
last updated 10/21/2003
download: txt, pdf
Water-Lily Family
3 taxa;
last updated 10/21/2003
download: txt, pdf
(see also Cabombaceae)
 
 
 
Olive Family
8 taxa;
last updated 10/21/2003
download: txt, pdf
Evening-Primrose Family
68 taxa;
last updated 2/1/2010
download: txt, pdf
Broom-Rape Family
61 taxa;
last updated 1/14/2010
download: txt, pdf
Wood-Sorrel Family
7 taxa;
last updated 10/21/2003
download: txt, pdf
Peony Family
1 taxon;
last updated 10/27/2009
download: txt, pdf
Poppy Family
18 taxa;
last updated 10/21/2003
download: txt, pdf
Parnassiaceae (see Celastraceae)
 
 
 
Princess Tree Family
1 taxon;
last updated 8/8/2012
download: txt, pdf
Penthorum Family
1 taxon;
last updated 11/6/2009
download: txt, pdf
Lopseed Family
28 taxa;
last updated 8/6/2012
download: txt, pdf
Pokeweed Family
1 taxon;
last updated 10/21/2003
download: txt, pdf
Plantain Family
111 taxa;
last updated 10/21/2003
download: txt, pdf
Plane-Tree Family, Sycamore Family
0 taxa;
last updated 8/23/2017
download: txt, pdf
Leadwort Family, Plumbago Family
4 taxa;
last updated 10/21/2003
download: txt, pdf
Phlox Family
57 taxa;
last updated 1/7/2010
download: txt, pdf
Milkwort Family
1 taxon;
last updated 5/21/2014
download: txt, pdf
Buckwheat Family
96 taxa;
last updated 11/27/2007
download: txt, pdf
Purslane Family
1 taxon;
last updated 8/7/2012
download: txt, pdf
(see also Montiaceae)
 
 
 
Primrose Family
28 taxa;
last updated 10/29/2009
download: txt, pdf
Pyrolaceae (see Ericaceae)
 
 
 
Buttercup Family
107 taxa;
last updated 4/13/2009
download: txt, pdf
Mignonette Family
2 taxa;
last updated 10/21/2003
download: txt, pdf
Buckthorn Family
9 taxa;
last updated 10/21/2003
download: txt, pdf
Rose Family
202 taxa;
last updated 12/31/2009
download: txt, pdf
Madder Family
18 taxa;
last updated 10/21/2003
download: txt, pdf
Willow Family
45 taxa;
last updated 4/2/2010
download: txt, pdf
Sandalwood Family
10 taxa;
last updated 12/10/2012
download: txt, pdf
Soapberry Family
9 taxa;
last updated 8/7/2012
download: txt, pdf
Greasewood Family
1 taxon;
last updated 11/4/2014
download: txt, pdf
Pitcherplant Family
4 taxa;
last updated 11/6/2009
download: txt, pdf
Saxifrage Family
61 taxa;
last updated 10/21/2017
download: txt, pdf
Figwort Family
13 taxa;
last updated 8/7/2012
download: txt, pdf
Quassia-Wood Family
1 taxon;
last updated 10/21/2003
download: txt, pdf
Potato Family
27 taxa;
last updated 2/8/2010
download: txt, pdf
Tamarisk Family
2 taxa;
last updated 10/21/2003
download: txt, pdf
Theophrastaceae (see Primulaceae)
 
 
 
Mezereum Family
3 taxa;
last updated 10/21/2003
download: txt, pdf
Elm Family
4 taxa;
last updated 10/21/2003
download: txt, pdf
Umbelliferae (see Apiaceae)
 
 
 
Nettle Family
7 taxa;
last updated 10/21/2003
download: txt, pdf
Valerian Family
15 taxa;
last updated 10/21/2003
download: txt, pdf
Verbena Family
6 taxa;
last updated 10/21/2003
download: txt, pdf
Violet Family
26 taxa;
last updated 2/5/2010
download: txt, pdf
Viscaceae (see Santalaceae)
 
 
 
Grape Family
3 taxa;
last updated 10/21/2003
download: txt, pdf
Creosote-Bush Family
2 taxa;
last updated 10/21/2003
download: txt, pdf
Monocots:
Family
Common Names
# of Taxa
Last Updated
Download
Sweet Flag Family
2 taxa;
last updated 12/24/2009
download: txt, pdf
Agavaceae (see Asparagaceae)
 
 
 
Water-Plantain Family
10 taxa;
last updated 12/15/2009
download: txt, pdf
Peruvian Lily Family
0 taxa;
last updated 8/8/2012
download: txt, pdf
AMaryllis Family
32 taxa;
last updated 8/6/2012
download: txt, pdf
Arum Family
13 taxa;
last updated 10/21/2003
download: txt, pdf
(see also Acoraceae)
 
 
 
Asparagus Family
25 taxa;
last updated 8/6/2012
download: txt, pdf
2 taxa;
last updated 8/8/2012
download: txt, pdf
Flowering Rush Family
1 taxon;
last updated 10/21/2003
download: txt, pdf
Spiderwort Family
2 taxa;
last updated 12/21/2008
download: txt, pdf
Sedge Family
210 taxa;
last updated 11/19/2009
download: txt, pdf
Gramineae (see Poaceae)
 
 
 
Frogbit Family, Tapegrass Family, Waterweed Family
10 taxa;
last updated 10/21/2003
download: txt, pdf
Iris Family
22 taxa;
last updated 12/27/2008
download: txt, pdf
Rush Family
71 taxa;
last updated 10/21/2003
download: txt, pdf
Arrow-grass Family
5 taxa;
last updated 10/21/2003
download: txt, pdf
(see also Scheuchzeriaceae)
 
 
 
Lemnaceae (see Araceae)
 
 
 
Lilaeaceae (see Juncaginaceae)
 
 
 
Lily Family
31 taxa;
last updated 4/20/2018
download: txt, pdf
Limnocharitaceae (see Alismataceae)
 
 
 
False-Hellebore Family
13 taxa;
last updated 8/8/2012
download: txt, pdf
Najadaceae (see Hydrocharitaceae)
 
 
 
Orchid Family
42 taxa;
last updated 12/12/2013
download: txt, pdf
Grass Family
363 taxa;
last updated 8/3/2009
download: txt, pdf
Pickerelweed Family
3 taxa;
last updated 10/21/2003
download: txt, pdf
Pondweed Family
23 taxa;
last updated 4/6/2009
download: txt, pdf
(see also Ruppiaceae)
 
 
 
Ditch-Grass Family
1 taxon;
last updated 10/21/2003
download: txt, pdf
Rannoch-rush Family, Scheuchzeria Family
1 taxon;
last updated 10/21/2003
download: txt, pdf
(see also Juncaginaceae)
 
 
 
1 taxon;
last updated 8/15/2018
download: txt, pdf
Sparganiaceae (see Typhaceae)
 
 
 
False-Asphodel Family
1 taxon;
last updated 8/6/2012
download: txt, pdf
Cat-Tail Family
9 taxa;
last updated 10/21/2003
download: txt, pdf
Vallisneriaceae (see Hydrocharitaceae)
 
 
 
Grasstree Family
2 taxa;
last updated 8/8/2012
download: txt, pdf
Zannichelliaceae (see Potamogetonaceae)
 
 
 
Eel-Grass Family
5 taxa;
last updated 10/21/2003
download: txt, pdf