Madia citriodora – lemon-scented tarplant, lemon tarweed, lemon-scented tarweed
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Nevada.
Habitat: Dry, open hillsides and foothills.
Origin: Native
Flowers: May-June
Growth Duration: Annual

Madia exigua – threadstem madia, little tarplant, little tarweed
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common east of the crest; British Columbia to California, east to Montana, Idaho, and Nevada.
Habitat: Dry, open woods, grasslands, roadsides, and other open areas where often disturbed, from the plains and foothills, occasionally up to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Annual

Madia gracilis – grassy tarplant, common tarweed, slender tarweed
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana, Idaho, Nevada, and Utah.
Habitat: Dry, open areas from shrub-steppe to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Annual

Mahonia aquifolium – holly-leaf Oregon-grape, shining Oregon-grape, tall Oregon-grape
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia to Northern California, east to northern Idaho and western Montana.
Habitat: Sagebrush slopes and open woods.
Origin: Native
Flowers: March-May
Growth Duration: Perennial

Mahonia repens – creeping Oregon-grape, low Oregon-grape
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Sagebrush valleys to open forested slopes.
Origin: Native
Flowers: April-June
Growth Duration: Perennial

Maianthemum racemosum – large false Solomon's seal, false spikenard
Distribution: Widely distributed on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains, also from the central U.S. to the Atlantic Coast of eastern North America.
Habitat: Open woodlands, forest edge, moist meadow and forest openings from sea level to middle elevations in the mountains.
Origin: Native
Flowers: April-July
Growth Duration: Perennial

Malaxis monophyllos – white adder's-mouth, one-leaved malaxis
Distribution: Reported to occur west of the Cascades crest in northwestern Washington, though no specimens seen; Alaska to northwestern Washington, east across Canada to the Great Lakes region and northeastern North America; disjunct in California and Colorado; also in Japan.
Habitat: Lowland bogs and swamps.
Origin: Native
Flowers: May-July
Growth Duration: Perennial

Malus ×dawsoniana – Dawson apple
Distribution: Occurring west of the Cascades crest in Washington; Washington to Oregon.
Habitat: Fields, thickets, open damp forests, sea bluffs, roadsides, wastelots, and abandoned homesteads.
Origin: Escaping from cultivation
Flowers: April-May
Growth Duration: Perennial

Malus fusca – Oregon crabapple, western crabapple
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California.
Habitat: Moist woods, swamps and open canyons from sea level to moderate elevations in the mountains.
Origin: Native
Flowers: April-May
Growth Duration: Perennial

Malus prunifolia – pearleaf crabapple, plumleaf crabapple
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Washington to northern Oregon, also in the Great Lakes region and northeastern North America.
Habitat: Damp thickets, forest edges, and riparian zones.
Origin: Introduced from Asia
Flowers: April-June
Growth Duration: Perennial

Malva neglecta – dwarf mallow
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, forest edge, fields, ditches, wastelots, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: May-September
Growth Duration: Annual, Biennial, Perennial

Malva pusilla – low mallow
Distribution: Occurring west of the Cascades crest in lowland western Washington; British Columbia to California, east to Idaho, also in the eastern half of North America.
Habitat: Roadsides, fields, ditches, wastelots, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: May-August
Growth Duration: Annual

Malvella leprosa – alkali-mallow
Distribution: Occurring east of the Cascades crest in Washington; north-central Washington to California, east to southern Idaho, the southern Rocky Mountains, and the southern Great Plains.
Habitat: Sagebrush deert, typically in sandy (often alkaline) soil.
Origin: Native
Flowers: June-September
Growth Duration: Perennial

Marrubium vulgare – white horehound
Distribution: Occurring on both sides of the Cascades crest in Washington Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Fields, roadsides, thickets, wastelots, and other disturbed areas.
Origin: Introduced from Eurasia
Flowers: June-October
Growth Duration: Perennial

Marsilea oligospora – Nelson's pepperwort, Pacific clover-fern water-clover
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Montana, Wyoming, and Utah.
Habitat: Ponds and marshes, in wet depressions in sagebrush and less commonly on river margins.
Origin: Native
Spores: June-October
Growth Duration: Perennial

Matricaria chamomilla – wild chamomile, scented mayweed
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east in sporadic occurrences to the Atlantic Coast.
Habitat: Roadsides, fields, wastelots, and other disturbed sites.
Origin: Introduced from Europe
Flowers: April-June
Growth Duration: Annual

Matthiola incana – hoary stock
Distribution: Occurring in scattered locations west of the Cascades crest in lowland western Washington; also known from California and Texas.
Habitat: Roadsides, sandy cliffs, beaches, wastelots, and other disturbed, open areas where escaped from cultivation.
Origin: Introduced from Europe
Flowers: June-July
Growth Duration: Biennial, Perennial

Mazus pumilus – Japanese mazus
Distribution: Occurring east of the Cascades crest and in the Columbia River Gorge in Washington; southern Washington to adjacent northern Oregon along the Columbia River; also in the southeastern U.S.
Habitat: Moist, sandy or silty riverbanks, and lawns.
Origin: Introduced from Asia
Flowers: May-November
Growth Duration: Annual

Medicago arabica – spotted medic
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, also in the southeastern U.S.
Habitat: Disturbed areas including wastelots, roadsides and fields.
Origin: Introduced from Eurasia
Flowers: April-July
Growth Duration: Annual

Medicago minima – little bur-clover, bur medic
Distribution: Occurring in the east end of the Columbia River Gorge in Washington; Washington to California, east along the southern U.S. to eastern North America, also in the Hells Canyon area in Idaho.
Habitat: Roadsides, wastelots, and other disturbed, open areas.
Origin: Introduced from Eurasia
Flowers: March-June
Growth Duration: Annual

Medicago sativa – alfalfa, lucerne
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.
Habitat: Roadsides, fields, wastelots, and other disturbed, open areas; often escaping from commercial cultivation.
Origin: Introduced
Flowers: May-October
Growth Duration: Annual, Perennial

Melica aristata – bearded melic grass
Distribution: Known historically in Washington from the Lewis River in Skamania County, but now best considered extirpated in Washington; southern Washington to California.
Habitat: Dry forest, rocky slopes, ridges, and ledges.
Origin: Native
Flowers: June-July
Growth Duration: Perennial

Melica fugax – small melic grass
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Idaho and Nevada.
Habitat: Meadows, damp or dry slopes, open forest, and riparian zones.
Origin: Native
Flowers: May-July
Growth Duration: Perennial

Melica smithii – Smith's melic grass
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to Oregon, east to Alberta, Montana, Wyoming and South Dakota; also in eastern Canada.
Habitat: Moist woods from the lowlands to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial

Melica subulata – Alaska oniongrass
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Open slopes to thick, dry or moist woods, from near sea level to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial

Melilotus indicus – annual yellow sweet-clover, small-flowered yellow sweet-clover
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, east to Idaho, Utah, and Nevada, further east across the southern U.S. and in eastern North America.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Introduced from Eurasia
Flowers: May-July
Growth Duration: Annual

Melissa officinalis – lemonbalm
Distribution: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington; Alaska to California, east to Idaho and Montana; also in central and eastern North America.
Habitat: Roadsides and other disturbed habitats.
Origin: Introduced from Eurasia
Flowers: June-August
Growth Duration: Perennial

Mentha canadensis – wild mint
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across Canada and most of the United States to the Atlantic Coast.
Habitat: Common in lake and pond shore margins, riparian zones, wetlands, and other wet areas at low elevations.
Origin: Native
Flowers: July-September
Growth Duration: Perennial

Mentha pulegium – pennyroyal
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California; also scattered in eastern North America.
Habitat: Moist, disturbed areas.
Origin: Introduced from Europe
Flowers: July-October
Growth Duration: Perennial

Mentha suaveolens – apple mint
Distribution: Occurring west of the Cascades crest in Washington, where questionably established in the flora; southwestern British Columbia to California; established in other areas of North America.
Habitat: Roadsides, wasteland, and other disturbed sites.
Origin: Introduced from Europe
Flowers: July-September
Growth Duration: Perennial

Mentzelia dispersa – bushy blazing-star
Distribution: Occurring east of the Cascades crest in Washington; Washington to southern California, east to the Rocky Mountains and northern Great Plains.
Habitat: Dry soil, from the plains into the canyons and slopes of the lower mountains.
Origin: Native
Flowers: May-July
Growth Duration: Annual

Mentzelia montana – mountain blazing-star
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Idaho, Wyoming, Colorado, New Mexico, and Texas.
Habitat: Montane slopes and forest openings.
Origin: Native
Flowers: May-July
Growth Duration: Annual

Mertensia amoena – beautiful bluebells, sagebrush bluebells
Distribution: Occurring east of the Cascades crest in central Washington; central Washington to Montana, south to Wyoming and Utah.
Habitat: Seasonally moist slopes and rocky areas in sagebrush desert.
Origin: Native
Flowers: April-June
Growth Duration: Perennial

Mertensia ciliata – mountain bluebells, streamside bluebells, tall fringed bluebells
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Rocky Mountains.
Habitat: Stream banks, wet meadows, damp thickets, and wet cliffs, from the foothills to high elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial

Mertensia longiflora – long-flowered bluebells, trumpet bluebells, long-flowered lungwort
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Montana and Nevada.
Habitat: Drier areas from low elevation sagebrush deserts to middle elevations in the mountains.
Origin: Native
Flowers: April-June
Growth Duration: Perennial

Mertensia platyphylla – broadleaf bluebell
Distribution: Occurring west of the Cascades crest in Washington, where currently considered endemic.
Habitat: Stream banks and moist, low woods at lower elevations.
Origin: Native
Flowers: May-July
Growth Duration: Perennial

Micranthes apetala – Tiny swamp saxifrage, western swamp saxifrage
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Idaho and Montana.
Habitat: Vernally moist meadows at low to middle elevations.
Origin: Native
Flowers: March-May
Growth Duration: Perennial

Micranthes fragosa – Clayton's saxifrage
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Idaho.
Habitat: Wet slopes and cliffs, often near watercourses.
Origin: Native
Flowers: April-June
Growth Duration: Perennial

Micranthes idahoensis – Idaho saxifrage
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon, east to Idaho and Montana.
Habitat: Exposed areas, ledges, and open slopes.
Origin: Native
Flowers: April-July
Growth Duration: Perennial

Micranthes lyallii – Lyall's saxifrage, red-stemmed saxifrage
Distribution: Occurring on both sides of the Cascades crest in northern Washington; Alaska to Washington, east to Alberta, Idaho, and Montana.
Habitat: Wet, gravelly meadows and along streams and ponds at high elevations.
Origin: Native
Flowers: July-September
Growth Duration: Perennial

Micranthes nidifica – Columbia saxifrage, swamp saxifrage
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Montana and Wyoming.
Habitat: Prairies and wet banks to subalpine meadows.
Origin: Native
Flowers: April-July
Growth Duration: Perennial

Micranthes odontoloma – brook saxifrage, streambank saxifrage
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Streambanks, lake shores and wet meadows from low elevations in the mountains to the alpine.
Origin: Native
Flowers: June-September
Growth Duration: Perennial

Micranthes rufidula – rusty-hair saxifrage
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California.
Habitat: Wet open areas, ledges, rock outcroppings from moderate to high elevations in the mountains.
Origin: Native
Flowers: February-August
Growth Duration: Perennial

Micranthes tolmiei – alpine saxifrage, Tolmie's alpine saxifrage, Tolmie's saxifrage
Distribution: Occurring in the Olympic and Cascade mountains in Washington; Alaska south to California, east to Idaho, Montana, Nevada and Utah.
Habitat: Mountain meadows, scree, and rock crevices at moderate to high elevations.
Origin: Native
Flowers: June-September
Growth Duration: Perennial

Micromonolepis pusilla – red povertyweed
Distribution: Occurring east of the Cascades crest in Washington; disjunct in central Washington, otherwise from southern Oregon to California, east to Nevada, Utah, Wyoming, and Colorado.
Habitat: Sagebrush-steppe desert, often where alkaline.
Origin: Native
Flowers: May-June
Growth Duration: Annual

Microseris bigelovii – coast microseris, coastal silverpuffs
Distribution: Known historically from west of the Cascades crest in the San Juan Islands in Washington, but now considered extirpated; southwestern British Columbia to California.
Habitat: Coastal sandy soils, dunes, occasionally in rocky areas, coastal islands, headlands, and bluffs.
Origin: Native
Flowers: May-June
Growth Duration: Annual

Microseris laciniata – cut-leaved microseris
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: Moist meadows and drier slopes from the lowlands to middle elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial

Microsteris gracilis – pink microsteris, slender phlox
Distribution: Occurring on both sides of the Cascades crest in Washington, though more common east of the crest; Alaska to California, east to the Rocky Mountains and Great Plains.
Habitat: Lowlands and foothills in open, dry to moderately moist places.
Origin: Native
Flowers: March-June
Growth Duration: Annual

Mimulus ringens – Allegheny monkey-flower, square-stemmed monkey-flower
Distribution: Occurring on both sides of the Cascades crest along the Columbia and Snake rivers in Washington; Washington to California, east to Idaho and Montana, also in central and eastern North America where native.
Habitat: Riparian corridors in open sites, tolerant of episodic or extensive inundation.
Origin: Introduced from central and eastern North America
Flowers: July-September
Growth Duration: Perennial

Miscanthus sinensis – Chinese silvergrass
Distribution: Occurring chiefly west of the Cascades crest in Washington;
Habitat: Fields, roadsides, forest edge, wastelots, and other disturbed, open areas.
Origin: Introduced from Asia
Flowers: July-October
Growth Duration: Perennial

Mitella nuda – bare-stemmed mitrewort
Distribution: Alaska south to the Cascades of northwest Washington, east to Labrador and south to north-central Montana.
Habitat: Damp woods, along streams and in bogs.
Origin: Native
Flowers: June - August
Growth Duration: Perennial

Moehringia lateriflora – blunt-leaf sandwort, bluntleaf sandwort
Distribution: Occurring on both sides of the Cascades crest in Washington, though more common east of the crest; Alaska to Oregon and Nevada, east across most of North America to the Atlantic Coast.
Habitat: Forest understory and edge, open meadows.
Origin: Native
Flowers: May-August
Growth Duration: Perennial

Moenchia erecta – upright chickweed
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California, also in scattered locations in other parts of the central and southern U.S.
Habitat: Open, disturbed areas at low elevations.
Origin: Introduced from Europe
Flowers: April-May
Growth Duration: Annual

Monardella odoratissima – mountain monardella
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington to California, east to Idaho and Nevada.
Habitat: Open, dry, often rocky places, low deserts to mid-elevations in the mountains.
Origin: Native
Flowers: May-August
Growth Duration: Perennial

Monotropa hypopitys – many-flower Indian-pipe
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: In humus of coniferous forests at low to mid-elevations.
Origin: Native
Flowers: May-July
Growth Duration: Perennial

Montia chamissoi – Chamisso's montia, water montia
Distribution: Occurring east of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains; scattered locations east of the Mississippi in the U.S.
Habitat: Wet areas, often in water, from the lowlands to mid-elevations in the mountains.
Origin: Native
Flowers: May-August
Growth Duration: Perennial

Montia diffusa – spreading candyflower, branching montia
Distribution: Occurring chiefly west of the Cascades crest in Washington; southern British Columbia to Marin County, California.
Habitat: Moist woods at low elevation.
Origin: Native
Flowers: April-July
Growth Duration: Annual

Montia howellii – Howell's montia
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California.
Habitat: Moist lowland areas.
Origin: Native
Flowers: April - May
Growth Duration: Annual

Montia parvifolia – littleleaf miner's lettuce, streambank springbeauty
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Idaho and Montana.
Habitat: Dry soils, rocky outcrops, and other open, exposed areas from the coast to the subalpine.
Origin: Native
Flowers: May-July
Growth Duration: Annual, Biennial, Perennial

Morus alba – white mulberry
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Idaho, also from the Great Plains eastward to the Atlantic Coast.
Habitat: Riparian corridors of rivers and streams, and other open disturbed areas where moist to wet.
Origin: Introduced from Asia
Flowers: April-June
Growth Duration: Perennial

Muhlenbergia asperifolia – alkali muhly, scratchgrass
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Great Plains.
Habitat: Dry to moist alkaline places.
Origin: Native
Flowers: June-September
Growth Duration: Perennial

Muhlenbergia glomerata – spiked muhly
Distribution: Occurring east of the Cascades crest in Washington; Yukon to northeastern Washington, Idaho and Nevada, east to the Atlantic.
Habitat: Peaty shores, rocky slopes, and roadsides.
Origin: Native
Flowers: July-September
Growth Duration: Perennial

Muhlenbergia minutissima – annual muhly, least muhly
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Great Plains.
Habitat: Springs, shores, damp or dry rocky slopes, and moist meadows.
Origin: Native
Flowers: July-September
Growth Duration: Annual

Murdannia keisak – wart-removing-herb
Distribution: Occurring west of the Cascades crest in the Lower Columbia River corridor in Washington; southwestern Washington and adjacent northwestern Oregon; also in southeastern United States.
Habitat: Ditches, swales and swamps, often in water.
Origin: Introduced from Asia
Flowers: August-October
Growth Duration: Perennial

Muscari botryoides – common grape-hyacinth
Origin: Introduced

Myosotis arvensis – field forget-me-not, field scorpion-grass
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to Oregon, east across the northern half of North America to the Atlantic Coast.
Habitat: Fields, roadsides, wastelots, and forest openings, typically associated with disturbance.
Origin: Introduced from Europe
Flowers: May-July
Growth Duration: Annual

Myosotis laxa – bay forget-me-not, small forget-me-not
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains; also in the eastern half of North America.
Habitat: In moist soil and shallow water, at low to moderate elevations.
Origin: Native
Flowers: June-September
Growth Duration: Annual, Biennial, Perennial

Myosotis scorpioides – common forget-me-not, true forget-me-not, water forget-me-not
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Wet areas from low to middle elevations in the mountains.
Origin: Introduced from Eurasia
Flowers: June-August
Growth Duration: Perennial

Myosotis sylvatica – woodland forget-me-not
Distribution: Occurring chiefly west of the Cascades crest in Washington; southern British Columbia to Oregon.
Habitat: Roadsides and moist woods at low elevations.
Origin: Introduced from Europe
Flowers: June-August
Growth Duration: Perennial

Myosoton aquaticum – giant chickweed, water chickweed
Distribution: Occurring east of the Cascades crest in southeastern Washington; British Columbia to Oregon, east to Idaho and Montana; also in central and eastern North America.
Habitat: Stream banks, woods, marshes and wet meadows.
Origin: Introduced from Europe
Flowers: June-October
Growth Duration: Perennial

Myosurus apetalus – bristly mouse-tail, sedge mouse-tail
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Wyoming.
Habitat: Moist areas and vernal streambeds, mostly low elevation grasslands and sagebrush, occasionally to subalpine.
Origin: Native
Flowers: March-June
Growth Duration: Annual

Myosurus sessilis – shor-tstemmed mouse-tail, vernal pool mouse-tail
Distribution: Occurring east of the Cascades crest in Washington, where known from Klickitat County in Washington; South-central Washington to north-central Oregon, also in central California.
Habitat: Vernal pools.
Origin: Native
Flowers: April-June
Growth Duration: Annual

Myriophyllum aquaticum – parrot's feather, water feather, South American water milfoil
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California and Idaho, east across the southwest to central and eastern North America.
Habitat: Ponds and slow-moving streams.
Origin: Introduced from South America
Flowers: May-July
Growth Duration: Perennial

Myriophyllum hippuroides – western milfoil, western water milfoil
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California; introduced in Illinois.
Habitat: Ponds and slow-moving streams.
Origin: Native
Flowers: May-October
Growth Duration: Perennial

Myriophyllum quitense – Andean water milfoil, waterwort water milfoil
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana, Wyoming, Utah, and Arizona, also in northeastern North America.
Habitat: Ponds and slow-moving streams.
Origin: Native
Flowers: June-August
Growth Duration: Perennial

Myriophyllum sibiricum × Myriophyllum spicatum – hybrid Eurasian milfoil
Distribution: Occurring on both sides of the Cascades crest in Washington; expected to occur wherever the two species co-occur.
Habitat: Ponds and quiet streams, including brackish water.
Origin: Introduced
Flowers: June-August
Growth Duration: Perennial

Myriophyllum ussuriense – terrestrial water milfoil, Ussurian milfoil
Distribution: Occurring west of the Cascades crest in Washington, where known only from Wahkiakum County. British Columbia to Oregon; also in Eurasia.
Habitat: Freshwater intertidal zone on mudflats. British Columbia south to Oregon; circumboreal.
Origin: Native
Flowers: June-August
Growth Duration: Perennial

Myriopteris gracilis – Fee's lace-fern, slender lace-fern, Fee's lip fern
Distribution: Occurring east of the Cascades crest in southeastern Washington; British Columbia to California, east to the midwestern U.S.
Habitat: Cliff crevices, especially on limestone, foothills to middle elevations in the mountains.
Origin: Native
Growth Duration: Perennial

Myriopteris intertexta – coastal lip fern
Distribution: Occurring east of the Cascades crest in southeastern Washington; south-central Washington to California, east to Nevada.
Habitat: Rock faces and basalt outcroppings at low elevations.
Origin: Native
Spores: April-August
Growth Duration: Perennial