Brassicaceae
Mustard Family
Synonyms:
Cruciferae
55 genera
164 species
18 subspecies and varieties
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Alliaria petiolatagarlic mustard
Distribution: Currently restricted to a few counties west of the Cascades in Washington; Alaska south to Utah, east across Canada and the U.S. to the Atlantic Coast.
Habitat: Disturbed soil and waste ground.
Origin: Introduced from Europe
Flowers: April-June
Alyssum alyssoidessmall alison, madwort, pale alyssum madwort
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America except for parts of southeastern U.S.
Habitat: Dry, waste areas, becoming common in the shrub-steppe of eastern Washington.
Origin: Introduced from Eurasia
Flowers: May-July
Alyssum desertorumdesert alyssum
Distribution: East of the Cascades in Washington; widely distributed throughout central and western North America.
Habitat: Dry, open ground, often where disturbed.
Origin: Introduced from Eurasia
Flowers: May-June
Alyssum muraleyellowtuft
Origin: Introduced
Arabidopsis lyrata
Origin: Native
ssp. kamchatica – lyreleaved cress, kamchatka rockcress, lyre-leaved rockcress, western rockcress
Arabidopsis thalianamouse-ear cress, thalecress
Distribution: Widely distributed througout Washington; widely distributed throughout North America.
Habitat: Disturbed areas, particularly near cities and towns.
Origin: Introduced from Eurasia
Flowers: March-May
Arabis crucisetosacrosshaired rockcress
Distribution: Occurring in the southeastern corner of Washington; Snake River canyon, Asotin County, Washington, east to west-central Idaho.
Habitat: Wet banks to moist soil or coniferous woods.
Origin: Native
Flowers: April-June
Arabis eschscholtzianahairy rockcress, Pacific coast rockcress
Distribution: Occurring on both sides of the Cascades in Washington; Alaska south to California, east to the northern Rocky Mountains.
Habitat: Open areas, often in waste places, from sea level to mid-elevations in the mountains.
Origin: Native
Flowers: April-July
Arabis furcataCascade rockcress, Columbia Gorge rockcress, fork-haired rockcress
Distribution: Occurring on both sides of the Cascades crest in Washington; Washington south to Oregon.
Habitat: Open slopes, meadows, and ridgelines in alpine and subalpine areas.
Origin: Native
Flowers: May-July
Arabis nuttalliiNuttall's rockcress
Origin: Native
Flowers: April - August
Arabis olympicaOlympics rockcress
Origin: Native
Armoracia rusticanahorseradish
Distribution: Occurring in scattered locations in eastern portion of Washington; British Columbia south to California, east across the U.S. and Canada to the Atlantic Coast.
Habitat: Disturbed areas including fields, roadsides and wastelots.
Origin: Introduced from Eurasia
Flowers: May-July
Athysanus pusillussandweed
Distribution: Both sides of the Cascades in Washington; British Columbia south to California, east to Idaho.
Habitat: Dry, open, often grassy places.
Origin: Native
Flowers: March-June
Barbarea orthocerasAmerican wintercress rocket, yellow rocket
Distribution: Widely distributed throughout Washington; Alaska to the mountains of California, east though the Rockies to the New England states.
Habitat: Meadows, stream banks and moist woods, low to mid-elevations in the mountains.
Origin: Native
Flowers: March-July
Barbarea vernaBelle Isle cress, landcress, early yellow rocket, scurvygrass, early wintercress
Origin: Introduced from Eurasia
Flowers: April - July
Barbarea vulgarisyellow rocket, bitter wintercress
Distribution: Chiefly west of the Cascades in Washington, with scattered locations east of the Cascades; distributed throughout much of the United States.
Habitat: Garden escape, found chiefly in wet places.
Origin: Introduced from Eurasia
Flowers: April-July
Berteroa incanahoary alyssum
Distribution: In scattered locations east of the Cascades in Washington; widely distributed throughout much of North America.
Habitat: Uncommon in dry, waste places in most of the Pacific Northwest; common in northeast Washington.
Origin: Introduced from Europe
Flowers: May-August
Boechera atrorubensblack-flowered rockcress
Distribution: East of the Cascades crest in Washington; Washington south to Oregon.
Habitat: Sagebrush and ponderosa pine country.
Origin: Native
Flowers: April-June
Boechera calderiCalder's rockcress
Origin: Native
Boechera cascadensisCascades rockcress
Origin: Native
Boechera cusickiiCusick's rockcress
Distribution: East of the Cascades in Washington; east-central Washington south to Nevada, east to central Idaho.
Habitat: Sagebrush flats to open Ponderosa pine forests, often on lithosol.
Origin: Native
Flowers: March-May
Boechera divaricarpaspreadingpod rockcress
Distribution: Occurring on both sides of the Cascades crest in Washington, and in the Olympic Mountains; Alaska south to California, east to the Rocky Mountains.
Habitat: From middle elevations to subalpine areas in the mountains.
Origin: Native
Flowers: June-August
Boechera drepanoloba
Origin: Native
Boechera grahamiiGraham's rockcress
Origin: Native
Boechera lemmoniiLemmon's rockcress
Distribution: Occurring in the Olympic Mountains and East Cascades in Washington; Alaska south to California, east to the Rocky Mountains.
Habitat: Alpine meadows, ridges and talus slopes.
Origin: Native
Flowers: July-September
Boechera lyalliiLyall's rockcress, murry's rockcress
Distribution: Widely distributed in the mountains throughout Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Subalpine to alpine ridges, cliffs, and drier meadows.
Origin: Native
Flowers: June-August
Boechera microphyllalittleleaf rockcress, small-leaved rockcress
Distribution: Occurring in Washington east of the Cacades crest; British Columbia south to eastern Oregon, east to Montana and Wyoming.
Habitat: Low montane to subalpine.
Origin: Native
Flowers: April-July
Boechera paddoensisMt. Adams rockcress
Distribution: Occurring east of the Cascades crest in the Mt. Adams area; Washington south to northeastern Oregon.
Habitat: Alpine slopes and talus.
Origin: Native
Flowers: July-August
Boechera paucifloraColumbia rockcress, few-flowered rockcress, pine rockcress, small-flowered rockcress
Distribution: East of the Cascades crest in Washington; British Columbia south to California, east to Montana and Utah.
Habitat: Sagebrush and ponderosa pine country.
Origin: Native
Flowers: April-June
Boechera paupercula
Origin: Native
Boechera pendulocarpadanglepod rockcress
Distribution: Chiefly east of the Cascades crest in Washington; Yukon Territory south to California, east to Montana, Wyoming, and Utah.
Habitat: From sagebrush and ponderosa pine slopes to well up in the mountains.
Origin: Native
Flowers: May-August
Boechera puberulaBlue Mountain rockcress, hoary rockcress
Origin: Native
Boechera retrofracta
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains, and east across Canada to Ontario.
Habitat: Sagebrush-steppe to forest openings at middle elevations.
Origin: Native
Flowers: April-June
Boechera sparsifloraelegant rockcress, slender rockcress
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to Idaho, Nevada, and Utah.
Habitat: From sagebrush plains to forest openings and meadows at moderate elevations.
Origin: Native
Flowers: May-July
Boechera strictaCanadian rockcress, Drummond's rockcress
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains, and east along the northern U.S. and southern Canada to the Atlantic Coast.
Habitat: Open areas in the forest at mid-elevations to sub-alpine meadows.
Origin: Native
Flowers: May-July
Boechera suffrutescenswoody rockcress
Origin: Native
Brassica junceaChinese, Indian, brown mustard, leaf mustard
Distribution: Occurring in scattered locations throughout Washington; widely distributed throughout North America.
Habitat: Disturbed areas including fields, roadsides and wastelots.
Origin: Introduced from Eurasia
Flowers: May-July
Brassica napusrape, winter rape, rapeseed
Distribution: Known from only a few scattered locations in Washington; widely distributed throughout much of North America.
Habitat: Disturbed areas including fields, roadsides, and wastelots, where often escaped from cultivation.
Origin: Introduced from Eurasia
Flowers: April-June
Brassica nigrablack mustard
Distribution: Occurring in scattered locations throughout Washington; widely distributed throughout much of North America.
Habitat: Distrubed areas such as roadsides, fields, and waste lots.
Origin: Introduced from Eurasia
Flowers: May-August
Brassica oleraceacabbage, wild cabbage
Distribution: Known only from San Juan County in Washington; Washington and California; more commonly found in northeastern North America.
Habitat: Disturbed areas including fields, roadsides, and wastelots, where escaped from cultivation.
Origin: Introduced from Europe
Flowers: May-August
Brassica rapacommon mustard, field mustard, wild turnip
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout North America.
Habitat: Distrubed areas such as roadsides, fields, and waste lots.
Origin: Introduced from Europe
Flowers: April-June
Cakile edentula
Distribution: Occurring in coastal counties in Washington; Alaska south to California along the coast.
Habitat: At water's edge in sand or gravel.
Flowers: June-September
ssp. edentula – American sea rocket
Cakile maritimaEuropean sea rocket
Distribution: Occurring along coastal counties in Washington; British Columbia south to California along the coast.
Habitat: At water's edge in sand or gravel.
Origin: Introduced from Europe
Flowers: May-September
Camelina microcarpahairy false flax, littlepod false flax
Distribution: East of the Cascades and in the Columbia River Gorge in Washington; widely distributed throughout nearly all of North America.
Habitat: Weed of dry places.
Origin: Introduced from Eurasia
Flowers: May-July
Capsella bursa-pastorisshepherd's-purse
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Weed of disturbed ground.
Origin: Introduced from Europe
Flowers: March-July
Cardamine angulataangled bittercress, seaside bittercress
Distribution: West of the Cascades in Washington; Alaska south to northern California.
Habitat: Wet ground, especially along stream banks, often in deep woods.
Origin: Native
Flowers: April-June
Cardamine bellidifoliaalpine bittercress
Distribution: In the Olympic and Cascade mountains in Washington; circumpolar, south in North America to California and New Hampshire.
Habitat: Subalpine to alpine meadows.
Origin: Native
Flowers: July-August
Cardamine breweriBrewer's bittercress, round bittercress
Distribution: Distributed on both sides of the Cascades in Washington; British Columbia to California, east to the Rocky Mountains from Montana south to Colorado.
Habitat: Stream margins, wet meadows, pond shores, and other riparian areas.
Origin: Native
Flowers: April-August
Cardamine cordifoliaheart-leaved bittercress, large mountain bittercress, Lyall's bittercress
Distribution: In the Cascades, but not the Olympic Mountains, in Washington; British Columbia south to California, east to Idaho.
Habitat: Streambanks and moist meadows in the mountains.
Origin: Native
Flowers: June-September
Cardamine corymbosaNew Zealand bittercress
Origin: Introduced
Cardamine flexuosawavy bittercress
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to California, also in central and eastern North America.
Habitat: Disturbed ground, often where moist.
Origin: Introduced from Eurasia
Flowers: April-September
Cardamine hirsutahairy bittercress
Distribution: Widely distributed throughout Washington; British Columbia to California and throughout much of the eastern half of the U.S.
Habitat: Disturbed ground at low elevations.
Origin: Introduced from Eurasia
Flowers: March-June
Cardamine nuttalliibeautiful bittercres, beautiful bittercress, Nuttall's toothwort, slender toothwort
Distribution: Occurring on both sides of the Cascades crest in Washington; Washington south to California.
Habitat: Seasonally moist soils of forest openings to forest understory, from low to moderate elevations.
Origin: Native
Flowers: March-May
Cardamine occidentaliswestern bittercress
Origin: Native
Flowers: April - July
Cardamine occultawood bittercress
Origin: Introduced
Cardamine oligospermafew-seeded bittercress, little western bittercress
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains; more common west of the Cascades in Washington.
Habitat: Widespread, but mostly in seasonally wet, open or forested areas.
Origin: Native
Flowers: March-July
Cardamine pensylvanicaPennsylvania bittercress, quaker bittercress
Distribution: Widespread throughout Washington; British Columbia south to California, east through the Rockies to the Atlantic Coast.
Habitat: Moist places.
Origin: Native
Flowers: April-July
Cardamine pratensiscuckooflower, cuckoo flower
Distribution: Currently known only from King County in Washington; British Columbia south to Oregon; more commonly found in northeastern North America.
Habitat: Disturbed areas including lawns and forest edges of urban and suburban areas.
Origin: Introduced
Flowers: April-May
Cardamine umbellataSiberian bittercress, umbellate bittercress
Origin: Native
Caulanthus lasiophyllusCalifornia mustard, cutleaf thelypody, coast range western-cabbage
Origin: Native
Chorispora tenellacrossflower, blue mustard
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout much of western and central North America.
Habitat: Shrub-steppe habitat, both degraded and intact; disturbed areas, roadsides, and pastures.
Origin: Introduced from SW Asia
Flowers: March-June
Cochlearia groenlandicaDanish scurvygrass, Danish scurvygrass; scurvy-grass; spoonwort
Origin: Native
Conringia orientalishare's-ear mustard, treacle mustard
Distribution: In scattered locations across Washington; distributed throughout much of North America.
Habitat: Roadsides and waste places.
Origin: Introduced from Eurasia
Flowers: May-August
Cusickiella douglasiialkali false whitlow-grass, Douglas' whitlow-grass
Distribution: Occurring in the south-central area of Washington along the Oregon border; Washington south to California, east to Idaho, Nevada, and Utah.
Habitat: Open, rocky ridges of the sagebrush desert, up into the lower mountains.
Origin: Native
Flowers: April-June
Descurainia incisa
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to Oregon and Nevada, east to the Rocky Mountains from Montana to Arizona, but not New Mexico.
Habitat: Moderately dry forest openings and sagebrush steppe.
Flowers: April-June
ssp. incisa – cut-leaved tansymustard
Descurainia longepedicellatamountain tansymustard, narrow tansymustard, sticky tansymustard
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to Oregon and Nevada, east to the Rocky Mountains from Montana to Arizona, but not New Mexico.
Habitat: Moderately dry forest openings and sagebrush steppe.
Origin: Native
Flowers: April-June
Descurainia nelsoniiNelson's tansymustard, sagebrush tansymustard
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Montana, Wyoming, Idaho, and Nevada.
Habitat: Sagrebrush-steppe to open montane forests.
Origin: Native
Flowers: May-June
Descurainia pinnata
Distribution: Occurring on both sides of the Cascades crest in Washington, but chiefly to the east; widely distributed throughout most of North America.
Habitat: Weedy native of fairly dry, open ground.
Origin: Native
Flowers: April-July
ssp. brachycarpa – shortpod tansymustard, western tansymustard
Descurainia sophiaflixweed
Distribution: East of the Cascades in Washington; introduced in most of the United States and Canada
Habitat: Weed of dry waste ground and other disturbed areas.
Origin: Introduced from Eurasia
Flowers: March-July
Draba albertinaAlaska draba, slender whitlow-grass
Distribution: Occurring in the the Olympics and Cascades Mountains in Washington; Alaska south to California, east to the Rocky Mountains.
Habitat: From subalpine meadows and forest openings to alpine meadows.
Origin: Native
Flowers: May-August
Draba aureagolden draba whitlow-grass
Origin: Native
Flowers: June - August
Draba aureolaalpine whitlow-grass, great alpine whitlow-grass, Mt. Lassen draba whitlow-grass
Distribution: Currently only known only from the Mt. Rainier area in Washington; Washington south to northern California
Habitat: Alpine areas, including scree and moraine areas.
Origin: Native
Flowers: July-August
Draba cana
Origin: Native
Draba crassifoliaRocky Mountain draba, thick-leaved draba, snowbed whitlow-grass
Distribution: Occurring in the Olympic Mountains and North Cascades in Washington; Alaska south to Washington, Nevada, east to the Rocky Mountains; east across northern Canada to Greenland; northern Europe.
Habitat: Subalpine and alpine meadows, often in rock crevices and outcroppings.
Origin: Native
Flowers: June-August
Draba densifoliaNuttall's draba, dense-leaf whitlow-grass
Distribution: Occurring east of the Cascades crest in Washington; Alaska south to California, east to Alberta, Idaho, Wyoming, Nevada and Utah.
Habitat: Open, rocky places from mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
Draba incertawhitlow-wort, Yellowstone draba whitlow-wort
Distribution: Occurring in the Cascades and Olympic Mountains in Washington; British Columbia and Alberta south to Washington, east to Montana and Wyoming.
Habitat: Alpine and subalpine slopes.
Origin: Native
Flowers: June-August
Draba lonchocarpalancefruit draba, lancefruit draba whitlow-wort
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Northwest Territories, south in Rocky mountains to Colorado.
Habitat: Alpine slopes, talus, and rocky outcroppings.
Origin: Native
Flowers: June-August
Draba nemorosawoods draba, woodland whitlow-grass
Distribution: In scattered locations on both sides of the Cascades crest in Washington; Alaska south to California, east across the northern half of the U.S. and Canada to the Atlantic Coast.
Habitat: Disturbed open areas and forest edges at low moderate elevations.
Origin: Native
Flowers: March-June
Draba novolympicadraba, Payson's whitlow-grass draba
Distribution: Occurring in the Olympics and Cascades mountains of Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Open slopes, talus ridges, and other exposed areas in the alpine.
Origin: Native
Flowers: June-August
Draba oligospermafew-seeded draba whitlow-grass
Distribution: In the North Cascades mountains in Washington; Alaska south to California, east to Colorado.
Habitat: Plains to moderate elevations in the mountains.
Origin: Native
Flowers: May-July
Draba platycarpabroad-pod whitlow-grass
Origin: Native
Flowers: March - June
Draba praealtadraba, tall whitlow-grass draba
Origin: Native
Flowers: June - August
Draba reptansCarolina whitlow-grass
Origin: Native
Flowers: March - May
Draba ruaxescoast mountain whitlow-grass draba
Origin: Native
Flowers: July - August
Draba stenolobaAlaska whitlow-grass
Origin: Native
Flowers: May - August
Draba tayloriiTaylor's draba
Origin: Native
Draba vernaspring whitlow-grass
Distribution: Widely distributed throughout Washington; widely distributed throughout North America; circumboreal.
Habitat: Shrub-steppe, grasslands, and open disturbed areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: February-May
Eruca vesicaria
Distribution: Introduced sparingly in the United States, mostly in California on the west coast; in Klickitat County and possibly a few other places in Washington.
Habitat: Grain fields and waste ground.
Origin: Introduced from Eurasia
Flowers: May - June
ssp. sativa – garden rocket
Erucastrum gallicumdog mustard, hairy rocket
Distribution: Weedy introduction from central Europe, fairly common in eastern United States; found in a few scattered locations in the Pacific Northwest.
Habitat: Waste areas and disturbed soil.
Origin: Introduced from Eurasia
Flowers: May - July
Erysimum arenicolasand-dwelling wallflower
Distribution: In the Olympics, Cascades, and Blue mountains of Washington; British Columbia south to Oregon.
Habitat: Open ridges and rock crevices, moderate to high elevations in the mountains.
Origin: Native
Flowers: June-September
Erysimum capitatum
Distribution: On both sides of the Cascades in Washington; Alaska south to California, east to Ohio and Texas.
Habitat: Often in sandy soil, plains to moderate elevations in the mountains.
Flowers: May-July
var. capitatum – prairie rocket, rough wallflower
Erysimum cheiranthoidestreacle mustard, wormseed wallflower
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Disturbed areas including fields, roadsides and wastelots, often where moist.
Origin: Introduced from Eurasia [possibly some native populations in w. N. Am.]
Flowers: June-August
Erysimum cheiriAegean wallflower
Distribution: West of the Cascades in Washington; scattered locations in western and eastern North America.
Habitat: Disturbed areas, often escaped from cultivation.
Origin: Introduced
Flowers: April-June
Erysimum inconspicuumprairie rocket, small-flowered rocket, small-flowered rocket rocket, small wallflower
Distribution: Known from the northeast region in Washington; Alaska south to Oregon and Nevada, east across much of the U.S. and Canada to the Atlantic Coast.
Habitat: Rock outcroppings and roadsides where calcareous, also tolerant of alkaline soils.
Origin: Native
Flowers: June-July
Erysimum occidentalepale wallflower, western wallflower
Distribution: East of the Cascades in Washington; Washington to Nevada, east to Idaho.
Habitat: Sagebrush hills and valleys.
Origin: Native
Flowers: March-May
Erysimum repandumspreading wallflower
Distribution: East of the Cascades in Washington; distributed throughout much of North America.
Habitat: Wasteland in dry areas, plains and lower mountains.
Origin: Introduced from Eurasia
Flowers: April-June
Euclidium syriacumeuclidium, Syrian mustard
Distribution: In scattered locations east of the Cascades crest in Washington; Washington south to California, east to Idaho, Wyoming, Utah, and Colorado; also in Massachusetts.
Habitat: Weed of roadsides and ditch banks.
Origin: Introduced from Eurasia
Flowers: May-June
Hesperis matronalismother-of-the-evening, dame's rocket, dame's violet
Distribution: Scattered locations on both sides of the Cascades in Washington; distributed throughout North America except for the southern portion of the U.S.
Habitat: Sometimes escaping and persisting on waste ground.
Origin: Introduced from Europe
Flowers: May-June
Hirschfeldia incanaMediterranean hoary mustard, short-podded mustard, summer mustard
Origin: Introduced
Hornungia procumbenshutchinsia, prostrate hutchinsia, ovalpurse
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains, central Canada, and Newfoundland.
Habitat: Open areas where seasonally moist.
Origin: Introduced
Flowers: March-June
Idahoa scapigeraflatpod, scalepod
Distribution: East of the Cascades in Washington; Washington sout to California, east to Idaho.
Habitat: Shrub-steppe, especially with sagebrush.
Origin: Native
Flowers: March-April
Isatis tinctoriaDyer's woad
Distribution: Known only from scattered locations in central Washington; British Columbia south to California, east to the Rocky Mountains; also occurring in parts of central and eastern North America.
Habitat: Disturbed dry ground, pastures, and roadsides, where often escaped from cultivation.
Origin: Introduced from Eurasia
Flowers: April-June
Lepidium appelianumglobepodded hoarycress, whitetop
Distribution: Widely distributed throughout many areas in Washington, though more common east of the Cascades crest; widely distributed throughout much of North America.
Habitat: Disturbed soil, waste areas, in dry and moist places.
Origin: Introduced from Asia
Flowers: April-August
Lepidium campestrefield cress, field peppergrass pepperwort
Distribution: Distributed across Washington in scattered locations; distributed throughout much of North America.
Habitat: Dry, disturbed areas.
Origin: Introduced from Eurasia
Flowers: May-July
Lepidium chalepensechalapa hoarycress, lens-podded hoarycress, Asian white-top
Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Disturbed areas, especially where dry, often associated with agriculture.
Origin: Introduced from Asia
Flowers: May-June
Lepidium densiflorumcommon peppergrass, elongate peppergrass, hairy-fruited peppergrass, large-fruited peppergrass, prairie peppergrass
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Dry, open areas.
Origin: Native
Flowers: April-June
Lepidium dictyotumalkali peppergrass, sharp-toothed peppergrass, veiny peppergrass
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Idaho, Nevada, and Utah.
Habitat: Open areas often where seasonally moist, such as vernal ponds; tolerant of alkaline soils.
Origin: Native
Flowers: April-May
Lepidium didymumlesser swinecress wartcress
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to California and Arizona, and Texas eastward and northward to the Atlantic Coast.
Habitat: Roadsides, gardens and wasteland.
Origin: Introduced from South America (or possibly Eurasia)
Flowers: May-July
Lepidium drabaheart-podded hoarycress, hoary pepperwort
Distribution: Occurring chiefly east of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Widespread weed in lowlands.
Origin: Introduced from Eurasia
Flowers: April-August
Lepidium heterophyllumSmith's pepperwort
Distribution: West of the Cascades in Washington; British Columbia south to California; in scattered locations in eastern U.S.
Habitat: Roadsides, pastures, and other disturbed ground.
Origin: Introduced from Europe
Flowers: May-June
Lepidium latifoliumdittander, broad-leaved pepperwort peppergrass
Distribution: Chiefly east of the Cascades in Washington but also found in the western lowlands; widely distributed throughout central and western North America.
Habitat: Moist areas and irrigated land, but also on drier areas.
Origin: Introduced from Eurasia
Flowers: June-September
Lepidium nitidumshining peppergrass
Distribution: Known from Klickitat County in Washington; Washington south to California.
Habitat: Dry, open areas at low elevation.
Origin: Native
Flowers: March-April
Lepidium oxycarpumforked pepperwort, sharpfruited pepperwort
Distribution: Chiefly in south-central California, rare in the Pacific Northwest.
Habitat: Usually on saline soil.
Origin: Native
Flowers: March - May
Lepidium perfoliatumclasping-leaved peppergrass, round-leaved peppergrass, yellow-flowered peppergrass, clasping peppergrass pepperwort
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout North America.
Habitat: Disturbed areas, such as overgrazed land and waste areas, usually where dry.
Origin: Introduced from Eurasia
Flowers: March-June
Lepidium ramosissimumbranched peppergrass, dull peppergrass
Distribution: Chiefly east of the Cascades in Washington; widely distributed throughout much of western and northern North America.
Habitat: Sagebrush, ponderosa pine forest openings, roadsides, fields, and other disturbed open areas.
Origin: Native
Flowers: June-August
Lepidium sativumgarden cress pepperwort
Origin: Introduced from western Asia
Flowers: April - June
Lepidium strictumupright peppergrass
Origin: Introduced
Lepidium virginicum
Distribution: Throughout the United States, north to Alaska
Habitat: Weedy native of the lowlands
Origin: Native
Flowers: March - June
ssp. menziesii – coastal peppergrass, hairy peppergrass, Idaho peppergrass, Menzies' peppergrass, tall peppergrass, tall western peppergrass
Lobularia maritimasweet alison, sweet alyssum
Distribution: Occurring in scattered locations across Washington; British Columbia south to Texas; also occurring throughout central and eastern North America.
Habitat: Escaping from cultivation to roadsides, pastures, and other disturbed areas, often where moist.
Origin: Introduced from the western Mediterranean
Flowers: April-August
Lunaria annuahonesty, money plant
Distribution: Distributed in scattered locations across Washington; British Columbia south to California and Utah; also distributed throughout eastern North America.
Habitat: Escaping from cultivation to urban forests, roadsides, and other disturbed areas.
Origin: Introduced from SE Europe
Flowers: March-June
Microthlaspi perfoliatumperfoliate pennycress
Distribution: Only found along eastern border in Washington; central and eastern U.S.
Habitat: Roadsides, pastures, and other open, disturbed ground.
Origin: Introduced from Europe
Flowers: March-May
Nasturtium microphyllum
Origin: Introduced
Nasturtium officinalewatercress
Distribution: Distributed on both sides of the Cascades in Washington; widely distributed throughout North America.
Habitat: Riparian zones and other wet areas.
Origin: Introduced from Europe
Flowers: May-September
Neslia paniculataball mustard
Distribution: Occurring east of the Cascades crest in Washington; Alaska south to Washington, east across Canada and the northern U.S. to the Atlantic Ocean.
Habitat: Disturbed areas including fields, roadsides, and forest openings.
Origin: Introduced from Europe
Flowers: May-June
Noccaea fendleri
Distribution: Occurring in the mountains throughout Washington; British Columbia south to California, east to Montana and New Mexico.
Habitat: Common in open, rocky areas at mid-elevations in the mountains.
Origin: Native
Flowers: May-August
ssp. glauca – wild candytuft
Phoenicaulis cheiranthoidesdaggerpod
Distribution: East of the Cascades in Washington; Washington to California, east to Idaho and Nevada.
Habitat: Shrub-steppe and open Ponderosa pine forests.
Origin: Native
Flowers: April-June
Physaria alpestrisalpine twinpod, Washington twinpod
Distribution: East side of the Cascades in Washington, Chelan County to Mt. Adams.
Habitat: Open rocky areas, mid- to high elevations in the mountains.
Origin: Native, endemic to Washington
Flowers: April-July
Physaria didymocarpa
Flowers: June - August
ssp. didymocarpa – common twinpod
Physaria douglasii
Distribution: British Columbia to northern Oregon, east to Idaho; chiefly near the Columbia and Snake Rivers
Habitat: Common in sagebrush desert, especially near or in juniper or ponderosa pine woodlands.
Flowers: March-July
ssp. douglasii – Columbia bladderpod, Douglas' bladderpod, Douglas's bladderpod
ssp. tuplashensis – white bluffs bladderpod, White Bluffs bladderpod
Physaria geyeri
Distribution: Occurring in eastern portion of Washington; Washington east to Idaho and Montana.
Habitat: Gravelly stream banks and hillsides.
Origin: Native
Flowers: May-July
ssp. geyeri – double bladderpod, Geyer's twinpod bladderpod, Geyer's twinpod
Physaria occidentalis
Distribution: Occurring east of the Cascades in Washington; Washington south to California, east to Idaho and Nevada.
Habitat: Open, rocky slopes at low to moderate elevations.
Origin: Native
Flowers: April-June
ssp. occidentalis – western bladderpod
Physaria oregonaOregon twinpod
Distribution: Occurring in southeastern corner of Washington; Washington east to Idaho, south to Oregon.
Habitat: Dry areas including rocky slopes, gravel banks, and stream shores.
Origin: Native
Flowers: April-June
Polyctenium fremontiicombleaf
Distribution: Known only from Grant County in Washington; Washington south to California, east to Idaho and Nevada.
Habitat: Open areas in sagebrush-steppe.
Origin: Native
Flowers: April-May
Raphanus raphanistrumjointed charlock, wild radish
Distribution: Occurring in scattered locations chiefly west of the Cascades; widely distributed throughout North America.
Habitat: Weed of waste ground.
Origin: Introduced, probably from the Mediterranean region
Flowers: May-July
Raphanus sativusgarden radish
Distribution: Occurring in scattered locations throughout Washington; widely distributed throughout North America.
Habitat: Waste places.
Origin: Introduced, probably from Mediterranean Europe
Flowers: May-July
Rorippa austriacaAustrian yellowcress field-cress
Distribution: Occurring in scattered locations chiefly east of the Cascades in Washington; Alberta south to California, east to coastal U.S.
Habitat: Disturbed areas and waste ground.
Origin: Introduced from Europe
Flowers: June-August
Rorippa columbiaeColumbia yellowcress cress
Distribution: In the south-central counties of Washington; Washington south to California.
Habitat: Moist, sandy soil.
Origin: Native
Flowers: May-August
Rorippa curvipesblunt-leaved yellowcress, truncate yellowcress
Distribution: Occurring chiefly east of the Cascades in Washington; widely distributed throughout western and central North America.
Habitat: Wet areas including streambanks, lake shores, wet meadows, and ditches.
Origin: Native
Flowers: May-September
Rorippa curvisiliquawestern yellowcress
Distribution: British Columbia to California, east to Montana and Nevada
Habitat: Stream banks and moist soil, low to mid-elevations in the mountains
Origin: Native
Flowers: May - September
Rorippa palustrishispid yellowcress, marsh yellowcress
Distribution: Widely distributed throughout Washington; common throughout North America.
Habitat: Wet ground and low elevations.
Origin: Native
Flowers: June-October
Rorippa sinuataspreading yellowcress
Distribution: Occurring in Klickitat County in Washington; British Columbia south to California, east to central North America.
Habitat: Wet areas including pond and lake margins, stream banks, and ditches.
Origin: Native
Flowers: May-September
Rorippa sylvestriscreeping yellowcress
Distribution: Known only from Whitman County in Washington; British Columbia south to Oregon, east across North America to the Atlantic Coast.
Habitat: Disturbed, moist areas at low to middle elevations.
Origin: Introduced from Europe
Flowers: May-August
Rorippa tenerrimaModoc yellowcress
Origin: Native
Sandbergia perplexapuzzling halimolobos
Distribution: Known from Douglas County in Washington; Washington east toIdaho and Montana.
Habitat: Sagebrush desert, typically on lithosol.
Origin: Native
Flowers: April-June
Sandbergia whitediifissurewort, whited's halimolobos fissurewort
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to Washington.
Habitat: Dry scabland, forest openings, talus slopes and alpine meadows.
Origin: Native
Flowers: April-July
Sinapis albawhite mustard
Distribution: Reported from Whitman County in Washington; widely distributed throughout North America.
Habitat: Waste ground near fields.
Origin: Introduced from the Mediterranean region
Flowers: May-June
Sinapis arvensischarlock, corn mustard, wild mustard
Distribution: Occurring in scattered locations throughout Washington; widely distributed throughout North America.
Habitat: Waste places and other disturbed areas.
Origin: Introduced from the Mediterranean region, reaching North America perhaps as early as 8000 years bp (Jacobson et al. 1988)
Flowers: May-June
Sisymbrium altissimumJim Hill mustard, tumble mustard, tall rocket
Distribution: Distributed throughout Washington but more common east of the Cascades; occurring throughout North America.
Habitat: Shrub-steppe, grasslands, and waste ground, especially following rangeland fires.
Origin: Introduced from Eurasia
Flowers: May-September
Sisymbrium linifoliumlava cress, rush mustard, flax-leaved plainsmustard, Salmon River plainsmustard
Distribution: East of the Cascades crest in Washington; British Columbia south to Arizona (not including California), east to the Rocky Mountains.
Habitat: Sagebrush-steppe communities, rock crevices.
Origin: Native
Flowers: April-June
Sisymbrium loeseliifalse london rocket, Loesel's tumblemustard
Distribution: Occurring east of the Cascades in Washington; British Columbia south to Nevada, east to the Atlantic Coast.
Habitat: Roadsides and drier disturbed areas.
Origin: Introduced from Eurasia
Flowers: June-August
Sisymbrium officinalehedge mustard
Distribution: Occurring chiefly west of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Waste ground and other disturbed areas at low elevations.
Origin: Introduced from Europe
Flowers: March-September
Smelowskia americanaalpine smelowskia, Siberian smelowskia
Distribution: In the Olympic and Cascades mountains in Washington; British Columbia and Alberta south to Nevada, east to the Rocky Mountains.
Habitat: Rocky areas at high elevations in the mountains.
Origin: Native
Flowers: May-August
Smelowskia ovalisshort-fruited smelowskia
Distribution: In the Cascades Mountains in Washington; British Columbia south to California.
Habitat: Rocky crevices, moraines, ridges and talus slopes in alpine and sup-alpine regions.
Origin: Native
Flowers: June-August
Streptanthella longirostrislong-beaked fiddle mustard, streptanthella
Distribution: Occurring in south-central Washington; Washington south to California, east to Wyoming and New Mexico.
Habitat: Open desert and sagebrush slopes.
Origin: Native
Flowers: April-May
Subularia aquatica
Distribution: Known from a few locations in northwestern Washington; Alaska to California, east to the Rocky Mountains and across the northern U.S. and Canada to the Atlantic Coast.
Habitat: Shallow water or mud flats of ponds, lakes, slow-moving streams, tidal flats, wet meadows, and marshes.
Flowers: July-September
ssp. americana – awlwort
Teesdalia nudicaulisshepherd's cress
Distribution: Introduced west of the Cascades in Washington; British Columbia south to California and in northeastern U.S.
Habitat: Sandy or gravelly soil at low elevations.
Origin: Introduced from Europe
Flowers: April-May
Thelypodium howellii
Origin: Native
Flowers: May - July
ssp. howellii – Howell's thelypody
Thelypodium integrifoliumentire-leaved thelypody
Distribution: Occurring east of the Cascades crest in Washington; Washington south to central Oregon and Nevada, east to Montana and Colorado.
Habitat: Sagebrush plains to streambanks in the lower mountains.
Flowers: June-August
ssp. integrifolium – entire-leaved thelypody
Thelypodium laciniatumcut-leaf thelypody, thick-leaved thelypody
Distribution: East of the Cascades in Washington; British Columbia to California, east to Idaho and Nevada.
Habitat: Rock cliffs and dry, rocky areas.
Origin: Native
Flowers: April-July
Thelypodium milleflorummany flowered thelypody
Distribution: Occurring east of the Cascades crest in Washington, chiefly near the Columbia River; Washington south to Nevada, east to Idaho.
Habitat: Rock cliffs and dry, rocky areas.
Origin: Native
Flowers: April-July
Thelypodium sagittatum
Flowers: June - July
ssp. sagittatum – sagittate thelypody, slender thelypody
Thlaspi arvensefanweed, field pennycress
Distribution: Distributed widely throughout Washington; widely introduced throughout North America.
Habitat: Weed of waste ground, low to moderate elevations.
Origin: Introduced from Europe
Flowers: April-August
Thysanocarpus curvipessand fringepod, lacepod
Distribution: Chiefly east of the Cascades in Washington; British Columbia south to California, east to Idaho.
Habitat: Uncommon on dry, open hillsides and borders of woodlands.
Origin: Native
Flowers: April-June
Turritis glabratower mustard
Distribution: Widely distributed throughout Washington; British Columbia south to northern California, east to the Rocky Mountain states.
Habitat: Seasonally moist, sometimes rocky, soil in open woods, clearings, and grassy balds.
Origin: Native
Flowers: May-July