Epilobium
spike-primrose, willow-herb, willow-weed
Synonyms:
Boisduvalia [HC]
25 species
1 subspecies and varieties
1 subspecies and varieties
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Epilobium anagallidifolium – alpine willow-herb, pimpernel willow-herb
Distribution: Alaska to California, east to the Rocky Mountains, also in northeastern North America; circumboreal.
Habitat: Subalpine to alpine slopes and meadows, seeps, stream banks, and damp gravel.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Alaska to California, east to the Rocky Mountains, also in northeastern North America; circumboreal.
Habitat: Subalpine to alpine slopes and meadows, seeps, stream banks, and damp gravel.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Epilobium brachycarpum – autumn willow-herb, tall annual willow-herb
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, northern Great Plains, and Great Lakes region.
Habitat: Common in dry, open meadows and grasslands to lightly wooded areas.
Origin: Native
Flowers: July-August
Growth Duration: Annual
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, northern Great Plains, and Great Lakes region.
Habitat: Common in dry, open meadows and grasslands to lightly wooded areas.
Origin: Native
Flowers: July-August
Growth Duration: Annual
Epilobium campestre – smooth willow-herb
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Mud flats, vernal pools.
Origin: Native
Flowers: June-July
Growth Duration: Annual
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Mud flats, vernal pools.
Origin: Native
Flowers: June-July
Growth Duration: Annual
Epilobium ciliatum – ciliate willow-herb, Watson's willow-herb
Distribution: Widely distributed on both sides of the Cascades crest in Washington. Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Moist soil from lowlands to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Widely distributed on both sides of the Cascades crest in Washington. Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Moist soil from lowlands to middle elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Epilobium clavatum – talus willow-herb
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta, Montana and Colorado.
Habitat: Moist meadows and talus slopes in the mountains, subalpine.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta, Montana and Colorado.
Habitat: Moist meadows and talus slopes in the mountains, subalpine.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
Epilobium densiflorum – dense-flower willow-herb
Distribution: Occurring on both sides of the Cascades in Washington; Vancouver Island, British Columbia to Baja California, east to Montana, Utah, and Arizona.
Habitat: Moist to seasonally moist meadows, springs, shores, riparian zones, slopes, roadsides, and ditches.
Origin: Native
Flowers: July-September
Growth Duration: Annual
Distribution: Occurring on both sides of the Cascades in Washington; Vancouver Island, British Columbia to Baja California, east to Montana, Utah, and Arizona.
Habitat: Moist to seasonally moist meadows, springs, shores, riparian zones, slopes, roadsides, and ditches.
Origin: Native
Flowers: July-September
Growth Duration: Annual
Epilobium glaberrimum – smooth willow-herb
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Wet places at mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Wet places at mid-elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Epilobium glandulosum – ciliate willow-herb
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, also across southern Canada and the northern U.S. to the Atlantic Coast.
Habitat: Moist meadows and riparian areas from coastal elevations to subalpine.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, also across southern Canada and the northern U.S. to the Atlantic Coast.
Habitat: Moist meadows and riparian areas from coastal elevations to subalpine.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Epilobium hallianum – glandular willow-herb, Hall's willow-herb
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Moist to wet areas from montane to alpine habitats.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Moist to wet areas from montane to alpine habitats.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Epilobium hirsutum – codlins-and-cream, fiddle grass, great willow-herb, hairy willow-herb
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia to Oregon; also in upper central and northeastern North America.
Habitat: Garden escape in wet areas at low elevations.
Origin: Introduced from Eurasia
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; southern British Columbia to Oregon; also in upper central and northeastern North America.
Habitat: Garden escape in wet areas at low elevations.
Origin: Introduced from Eurasia
Flowers: June-August
Growth Duration: Perennial
Epilobium hornemannii – Hornemann's willow-herb
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and northern Great Plains; also in eastern North America; circumboreal.
Habitat: Wet rocky areas and streambanks, low to subalpine elevations.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and northern Great Plains; also in eastern North America; circumboreal.
Habitat: Wet rocky areas and streambanks, low to subalpine elevations.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
• ssp. hornemannii – Hornemann's willow-herb
Epilobium lactiflorum – white-flower willow-herb
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, also in eastern North America; circumboreal.
Habitat: Mesic to wet meadows, stream banks, and talus, from middle to high elevations in the mountains.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, also in eastern North America; circumboreal.
Habitat: Mesic to wet meadows, stream banks, and talus, from middle to high elevations in the mountains.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
Epilobium leptocarpum – slender-fruit willow-herb
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska to Oregon, east to Alberta and Idaho.
Habitat: Damp rocky slopes and ledges, shores, and wet meadow margins.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska to Oregon, east to Alberta and Idaho.
Habitat: Damp rocky slopes and ledges, shores, and wet meadow margins.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Epilobium leptophyllum – bog willow-herb
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Montana; also in eastern North America, where native.
Habitat: Peatlands, marshes, and wet meadows.
Origin: Introduced from eastern North America
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Montana; also in eastern North America, where native.
Habitat: Peatlands, marshes, and wet meadows.
Origin: Introduced from eastern North America
Flowers: June-August
Growth Duration: Perennial
Epilobium luteum – yellow willow-herb
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta.
Habitat: Stream banks and wet areas at mid- to high elevations in the mountains.
Origin: Native
Flowers: July-September
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Alberta.
Habitat: Stream banks and wet areas at mid- to high elevations in the mountains.
Origin: Native
Flowers: July-September
Growth Duration: Perennial
Epilobium minutum – California willow-herb, chaparral willow-herb, small-flowered willow-herb
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, Montana, Utah, and Arizona.
Habitat: Dry or gravelly soil, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: April-August
Growth Duration: Annual
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Alberta, Montana, Utah, and Arizona.
Habitat: Dry or gravelly soil, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: April-August
Growth Duration: Annual
Epilobium mirabile – Olympic Mountain willow-herb
Distribution: Occurring west of the Cascades crest in the Olympic and North Cascades mountains in Washington; southern British Columbia to northern Washington, east to Alberta.
Habitat: Wet to dry scree, talus, steep slopes, often limy, from subalpine to alpine.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring west of the Cascades crest in the Olympic and North Cascades mountains in Washington; southern British Columbia to northern Washington, east to Alberta.
Habitat: Wet to dry scree, talus, steep slopes, often limy, from subalpine to alpine.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Epilobium obscurum – dwarf willow-herb
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to western Washington; also in the Great Lakes region.
Habitat: Disturbed ground, gravel, open forest, paths, roadsides, and gardens.
Origin: Introduced from Eurasia and northern Africa
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to western Washington; also in the Great Lakes region.
Habitat: Disturbed ground, gravel, open forest, paths, roadsides, and gardens.
Origin: Introduced from Eurasia and northern Africa
Flowers: June-August
Growth Duration: Perennial
Epilobium oregonense – Oregon willow-herb
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana, Wyoming, and Arizona.
Habitat: Streambanks, bogs, and wet meadows from moderate elevations in mountains to alpine.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana, Wyoming, and Arizona.
Habitat: Streambanks, bogs, and wet meadows from moderate elevations in mountains to alpine.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
Epilobium palustre – marsh willow-herb
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska east to California, east to the Rocky Mountains, Great Lakes region, and the Atlantic coast;.
Habitat: Wet soil, often in bogs.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska east to California, east to the Rocky Mountains, Great Lakes region, and the Atlantic coast;.
Habitat: Wet soil, often in bogs.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Epilobium smithii – talus willow-herb
Distribution: Occurring in the Cascades and Olympic Mountains in Washington; British Columbia to Washington east to Alberta and in Montana; disjunct in Utah.
Habitat: Moist talus or scree slopes, crevices of rocky outcrops, often on south-facing subalpine to alpine slopes.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Distribution: Occurring in the Cascades and Olympic Mountains in Washington; British Columbia to Washington east to Alberta and in Montana; disjunct in Utah.
Habitat: Moist talus or scree slopes, crevices of rocky outcrops, often on south-facing subalpine to alpine slopes.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Epilobium torreyi – brook willow-herb
Distribution: Occurring east of the Cascades crest in Washingtpn; southwestern British Columbia to California, east to Idaho and Nevada.
Habitat: Places that are soggy with standing water in winter and spring, drying in summer.
Origin: Native
Flowers: June-July
Growth Duration: Annual
Distribution: Occurring east of the Cascades crest in Washingtpn; southwestern British Columbia to California, east to Idaho and Nevada.
Habitat: Places that are soggy with standing water in winter and spring, drying in summer.
Origin: Native
Flowers: June-July
Growth Duration: Annual
