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 foliosa – leafy bluebells
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, Montana, Wyoming, Utah, and Nevada.
Habitat: Deeper soils in sagebrush habitat.
Origin: Native
Flowers: May-June
Growth Duration: Perennial

Mertensia paniculata – northern bluebell, tall bluebell
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to Oregon, east to Montana, also in the Great Lakes region and eastern Canada.
Habitat: Streambanks and wet meadows at mid-elevations in the mountains
Origin: Native
Flowers: May-August
Growth Duration: Perennial

Mertensia umbratilis – shade bluebell
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon.
Habitat: Forest openings and seasonally moist areas at low to middle elevations.
Origin: Native
Flowers: April-May
Growth Duration: Perennial

Micranthes ferruginea – rusty saxifrage
Distribution: Occurring in the Cascades and Olympic Mountains, and in the mountains of northeastern in Washington; Alaska to south California, east to Idaho, Montana, and Wyoming.
Habitat: Open, moist, often rocky areas, from low to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial

Micranthes gormanii – Gorman's saxifrage
Distribution: Occurring west of the Cascades crest in the Lower Columbia River Gorge; southwestern Washington to adjacent Oregon.
Habitat: Wet rocky ledges and slopes.
Origin: Native
Flowers: May-June
Growth Duration: Perennial

Micranthes integrifolia – Columbian saxifrage, swamp saxifrage, whole-leaf saxifrage
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California.
Habitat: Prairies, grassy slopes and vernally moist areas, sea level to subalpine.
Origin: Native
Flowers: March-July
Growth Duration: Perennial

Micranthes nelsoniana – dotted saxifrage
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to Oregon, east to Nunavut and Alberta.
Habitat: Montane wet areas and streambanks from low to middle elevations.
Origin: Native
Flowers: May-July
Growth Duration: Perennial

Micranthes occidentalis – mountain saxifrage, redwool saxifrage, western saxifrage
Distribution: Both sides of the Cascades in Washington; Alaska south to Oregon and Nevada, east to Saskatachewan and south to New Mexico.
Habitat: Dry to wet open areas, rock crevices, meadows, and streambanks from moderate to high elevations in the mountains.
Origin: Native
Flowers: May-August
Growth Duration: Perennial

Micranthes oregana – bog saxifrage, Oregon saxifrage
Distribution: Both sides of the Cascades crest in Washington; Washington to California, east to Alberta, Montana, Idaho, Nevada, and Colorado.
Habitat: Bogs, streambanks and wet meadows at mid-elevations in the mountains.
Origin: Native
Flowers: April-July
Growth Duration: Perennial

Micranthes tischii – Olympic saxifrage
Distribution: Endemic to Washington, where known from the Olympic Mountains and Washington Pass in Okanogan County.
Habitat: Forested ledges and rock crevices where moist.
Origin: Native
Flowers: May-July
Growth Duration: Perennial

Microgilia minutiflora – small-flowered gilia, small-flower skyrocket
Distribution: Occurring east of the Cascades crest in Washington; south-central British Columbia to eastern Oregon, east to western Montana and southern Idaho.
Habitat: Dry, sandy places at low elev, often with sagebrush.
Origin: Native
Flowers: April-June
Growth Duration: Annual

Micropus californicus – cottontop, Q-tips
Distribution: Occurring east of the Cascades crest in the Columbia River Gorge in Washington; south-central Washington to California.
Habitat: Dry, open areas at low to moderate elevations.
Origin: Native
Flowers: April-May
Growth Duration: Annual

Microseris borealis – apargidium, bog microseris, northern silverpuffs
Distribution: Occurring west of the Cascades crest in Washington; southern Alaska to northern California.
Habitat: Sphagnum bogs and wet meadows in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial

Microseris nutans – nodding microseris, nodding scorzonella, nodding silverpuffs
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Slopes, meadows, flats, and forest openings,often in somewhat moist places, from low to middle elevations.
Origin: Native
Flowers: April-July
Growth Duration: Perennial

Mimetanthe pilosa – downy monkey-flower, false monkey-flower
Distribution: Occurring east of the Cascades crest in Washington; central Washington to Baja California, east to southwestern Idaho, Utah, and Arizona.
Habitat: Moist, sandy areas and dry stream beds.
Origin: Native
Flowers: May-July
Growth Duration: Annual

Mirabilis nyctaginea – four-o'clock, heartleaf umbrellawort four-o'clock
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Washington, east to Motana; native to central and eastern North America.
Habitat: Disturbed areas of dry valleys and plains.
Origin: Introduced from east of the Rocky Mountains
Flowers: June-August
Growth Duration: Perennial

Misopates orontium – lesser snapdragon, weasel's snout
Distribution: Occurring west of the Cascades crest in Washington; Alaska to California, also in Idaho and Utah; also in eastern North America.
Habitat: Disturbed areas in urban settings.
Origin: Introduced from Europe
Flowers: May-July
Growth Duration: Annual

Mitellastra caulescens – leafy mitrewort, star-shaped mitrewort
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to northwest California, east to Idaho and Montana.
Habitat: Shady woods, wet meadows and swamps, low to mid-elevations.
Origin: Native
Flowers: April-June
Growth Duration: Perennial

Moehringia macrophylla – large-leaf sandwort
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, also east across Canada to the Great Lakes region and northeastern North America.
Habitat: Moist to dry, shaded to open woods, meadows and rocky slopes in the mountains
Origin: Native
Flowers: May-August
Growth Duration: Perennial

Mollugo verticillata – carpetweed, green carpetweed
Distribution: Occurring chiefly east of the Cascades in Washington; British Columbia to Baja California, east over nearly all of temperate North America.
Habitat: Moist, often waste ground, especially along river banks.
Origin: Native
Flowers: June--October
Growth Duration: Annual

Moneses uniflora – single-delight
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska sto California, east to the Rocky Mountains and in eastern North America.
Habitat: Moist woods with high-humas soils, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial

Monotropa uniflora – one-flower Indian-pipe
Distribution: Occurring west of the Cascades crest, in the Columbia River Gorge, and in the northeastern counties in Washington; British Columbia to California, east to Idaho and Montana, and in all other areas of North America except the southern Rocky Mountain states.
Habitat: In forest understory and on forest edge, often in deep soil, at low to moderate elevations.
Origin: Native
Flowers: May-August
Growth Duration: Perennial

Montia dichotoma – dwarf montia
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Idaho and western Montana.
Habitat: Moist areas in the lowlands.
Origin: Native
Flowers: April-June
Growth Duration: Annual

Montia fontana – water blinks, water chickweed, annual water miner's lettuce
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Idaho, eastward across northern Canada to eastern North America.
Habitat: Wet places, including meadows, fields, lawns, and vernally moist sites, sometimes aquatic and floating, low to moderate elevations.
Origin: Native
Flowers: March-June
Growth Duration: Annual, Biennial

Montia linearis – lineleaf miner's lettuce, narrow-leafed montia
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Calfornia, east to the Rocky Mountains.
Habitat: Moist to dry, usually sandy soil, low to moderate elevations.
Origin: Native
Flowers: April-July
Growth Duration: Annual

Morella californica – Pacific bayberry, Pacific wax-myrtle
Distribution: Occurring west of the Cascades crest along the outer coast in Washington; coastal Vancouver Island, British Columbia to California.
Habitat: Hillsides and sandy areas near the coast.
Origin: Native
Flowers: April-May
Growth Duration: Perennial

Muhlenbergia andina – foxtail muhly
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Great Plains.
Habitat: Shores, seeps, hot springs, and moist meadows.
Origin: Native
Flowers: July-September
Growth Duration: Perennial

Muhlenbergia filiformis – pullup muhly
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and Kansas.
Habitat: Moist or wet meadows, shores, seeps, hot springs, and stream banks.
Origin: Native
Flowers: June-August
Growth Duration: Annual

Muhlenbergia mexicana – wirestem muhly
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.
Habitat: Rocky, sandy, or silty riverbanks, shores, moist or mesic slopes, roadsides, ditches, and railroads.
Origin: Native
Flowers: June-August
Growth Duration: Perennial

Muhlenbergia richardsonis – matted muhly
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, Great Plains, Great Lakes region, and northeastern North America.
Habitat: Moist to dry lowlands, meadows, mountain prairies and rocky slopes.
Origin: Native
Flowers: July-August
Growth Duration: Perennial

Muscari armeniacum – Armenian grape-hyacinth, garden grape-hyacinth
Distribution: Occurring chiefly west of the Cascades crest in Washington; southwestern British Columbia to Oregon, also in Oregon.
Habitat: Forest edge, distrubed, open areas.
Origin: Introduced from Eurasia
Flowers: March-May
Growth Duration: Perennial

Mycelis muralis – wall lettuce
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common west of the crest; British Columbia to Oregon; also in eastern North America.
Habitat: Roadsides, fields, wastelots, and other disturbed, open areas from the lowlands to middle elevations in the mountains.
Origin: Introduced from Europe
Flowers: July-September
Growth Duration: Annual

Myosotis discolor – yellow and blue forget-me-not, yellow and blue scorpiongrass
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to Montana and Nevada; also in eastern North America.
Habitat: Roadsides, fields, wastelots, and other dry to moist open areas.
Origin: Introduced from Europe
Flowers: April-August
Growth Duration: Annual

Myosotis ramosissima – early forget-me-not
Distribution: Occurring in the Columbia River Gorge in Washington; also in eastern North America.
Habitat: Balds, prairies, grassy embankments, roadsides, and other disturbed open places at low elevations.
Origin: Introduced from Europe and Mediterranean region
Flowers: March-May
Growth Duration: Annual

Myosotis stricta – blue scorpion-grass
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across much of North America to the Atlantic Coast.
Habitat: Balds, prairies, roadsides, wastelots, and other disturbed, open moist to dry places.
Origin: Introduced from Eurasia
Flowers: April-June
Growth Duration: Annual

Myosotis verna – early forget-me-not, spring forget-me-not, early scorpion-grass, spring scorpion-grass
Distribution: Occurring on both sides of the Cascades crest in Washington British Columbia to California, east to the Atlantic Coast.
Habitat: Open, wet to dry places in foothills and lowlands.
Origin: Native
Flowers: May-July
Growth Duration: Annual, Biennial

Myosurus ×alopecuroides – hybrid mouse-tail
Distribution: Occurring east of the Cascades crest in Washington; eastern Washington to California, east to Elmore County, Idaho.
Habitat: Verrnal pools and alkali flats in sagebrush desert.
Origin: Native
Flowers: March-May
Growth Duration: Annual

Myosurus minimus – tiny mouse-tail
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to south-central Canada and across the central U.S. to the southeastern states.
Habitat: Wet places, especially vernal pools.
Origin: Native
Flowers: April-June
Growth Duration: Annual

Myrica gale – sweetgale
Distribution: Occurring west of the Cascades crest in Washington; Alaska to Oregon, east across Canada to the Great Lakes region and northeastern North America.
Habitat: Coastal bogs, swamps, lakes, and streams.
Origin: Native
Flowers: April-June
Growth Duration: Perennial

Myriophyllum heterophyllum – two-leaf milfoil, various-leaved water-milfoil
Distribution: Occurring west of the Cascades crest, where known only from the Puget Sound lowlands; British Columbia to Washington, native from Texas to central and eastern North America.
Habitat: Lakes and ponds.
Origin: Introduced from central and eastern North America
Flowers: May-October
Growth Duration: Perennial

Myriophyllum pinnatum – cutleaf water-milfoil
Distribution: Occurring west of the Cascades crest in Washington, where known only from Thurston County; southern British Columbia to Oregon, also in eastern North America.
Habitat: Lakes, sloughs, ditches, slow streams.
Origin: Native
Flowers: June-August
Growth Duration: Perennial

Myriophyllum sibiricum – American milfoil, northern milfoil, Siberian water milfoil
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Ponds and quiet streams, often in brackish water.
Origin: Native
Flowers: June-August
Growth Duration: Perennial

Myriophyllum spicatum – Eurasian water milfoil, spiked water milfoil
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across most of North America to the Atlantic Coast.
Habitat: Ponds, lakes, and quiet streams.
Origin: Introduced from Eurasia
Flowers: April-October
Growth Duration: Perennial

Myriophyllum verticillatum – verticillate milfoil, whorled water milfoil
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast except in the southeastern U.S.
Habitat: Aquatic habitats below the water surface.
Origin: Native
Flowers: June-August
Growth Duration: Perennial

Myriopteris gracillima – lace lip fern
Distribution: Occurring on both sides of the Cascades crest and in the Olympic Mountains in Washington; southern British Columbia to California, east to western Montana, Idaho, Nevada and Utah.
Habitat: Cliffs and rocky slopes from middle elevations to alpine.
Origin: Native
Spores: May-September
Growth Duration: Perennial