Epilobium species

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Scientific Name Epilobium anagallidifolium USDA PLANTS Symbol EPAN4
Common Name Alpine Willowherb ITIS Taxonomic Serial No. 27283
Family Onagraceae (Evening Primrose) UC Jepsen
Reference
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Description Life zones and habitat: Montane to alpine (8500 to 13500 ft.); moist areas along streams, lakes, moist meadows, tundra.
Plant: Small, tufted, mat-forming perennial 1 to 9 inches tall.
Leaves: Opposite, stem leaves vary from narrowly elliptic to ovate to oblanceolate, 1/2 to 1 inch long, dark green or red-tinged.
Inflorescence: A few small pink to rose flowers in a terminal raceme with 4 notched petals.
Bloom Period: July and August.
References: "Flora of Colorado" by Jennifer Ackerfield, E-Flora BC and www.swcoloradowildflowers.com.
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Epilobium brachycarpum USDA PLANTS Symbol EPBR3
Common Name Tall Annual Willowherb, Panicled Willowherb ITIS Taxonomic Serial No. 27288
Family Onagraceae (Evening Primrose) SEINet
Reference
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Description Life zones and habitat: Foothills and montane (5500 to 9700 ft.); roadsides, meadows, woodlands, disturbed areas.
Plant: Erect annual with branching stems, 8 to 40 inches tall; smooth below and glandular (sticky) above.
Leaves: Alternate along most of the stem and branches, opposite near the base, petiolate, narrowly lanceolate to linear, margins mostly entire or toothed; leaves of the main stem 1-1/4 to 2-3/4 inches long, much shorter on side branches.
Inflorescence: A few funnel-shaped rose to pale pink flowers less than 3/4-inch long in lax racemes at the ends of the branches; petals less than 1/3-inch long and deeply-notched at the tips; linear bracts, sometimes purplish; 8 stamens.
Bloom Period: June to August.
References: "Flora of Colorado" by Jennifer Ackerfield, SEINet and Burke Herbarium.
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Epilobium ciliatum ssp. ciliatum USDA PLANTS Symbol EPCIC
Common Name Fringed Willowherb ITIS Taxonomic Serial No. 27294
Family Onagraceae (Evening Primrose) SEINet
Reference
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Description Lifezones and habitat: Foothills to subalpine (5000 to 11500 ft.); moist or dry conditions, roadsides and meadows. Photos below taken in very wet forested area.
Plant: Highly variable species; erect perennial 8 to 48 inches tall, may be branched or not; upper stems with short hairs.
Leaves: Lower leaves opposite becoming alternate further up the stem; lanceolate with pointed tip, from less than 1/2-inch to almost 4 inches long; edges with small teeth.
Inflorescence: Small white to pink flowers on stalks, a leaf-like bract the base of each stalk at the axil with the stem; 4 notched petals, 8 stamens.
Bloom Period: June to August.
References: UCLA-Santa Monica, E-Flora BC, and www.swcoloradowildflowers.com.
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Epilobium hornemannii var. hornemannii USDA PLANTS Symbol EPHOH
Common Name Hornemann's Willowherb ITIS Taxonomic Serial No. 27307
Family Onagraceae (Evening Primrose) Jepson eFlora
Reference
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Description Life zones and habitat: Montane to alpine (8000 to 12000 ft.); moist areas along streambanks and in meadows.
Plant: Erect, leafy perennial 4 to 20 inches tall.
Leaves: Opposite, ovate to lanceolate stem leaves, 1/2 to 2 inches long; very short (~1/4 inch) or no petioles; edges smooth or with a few small teeth.
Inflorescence: Small pink to rose-purple flowers on stalks 1/4 to 2 inches long, each with 4 notched petals.
Bloom Period: June to August.
References: "Flora of Colorado" by Jennifer Ackerfield, Jepson eFlora and www.swcoloradowildflowers.com.
BONAP Distribution Map

Colorado Status:
Native
Scientific Name Epilobium lactiflorum (Epilopium hornemannii var. lactiflorum) USDA PLANTS Symbol EPLA3
Common Name Whiteflower Willowherb, Milkflower Willowherb ITIS Taxonomic Serial No. 27309
Family Onagraceae (Evening Primrose) Jepson eFlora
Reference
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Description Life zones and habitat: Montane to alpine (8000 to 12000 ft.); moist areas along streambanks and in meadows.
Plant: Erect, leafy perennial 4 to 20 inches tall.
Leaves: Opposite, narrowly-ovate to lanceolate stem leaves, usually stalkless, 3/4 to 2-1/8 inches long; edges smooth or with a few small teeth.
Inflorescence: Small white flowers on stalks 1/4 to 2 inches long, each with 4 notched petals and club-like stigma.
Bloom Period: June to August.
References: E. hornemannii var. lactiflorum in "Flora of Colorado" by Jennifer Ackerfield, Jepson eFlora and E-Flora BC.
BONAP Distribution Map

Colorado Status:
Native



© Tom Lebsack 2020