E-Flora BC: Electronic Atlas of the Flora of British Columbia

Epilobium saximontanum Hausskn.
Rocky Mountain willowherb
Onagraceae (Evening Primrose family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #20657)

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Distribution of Epilobium saximontanum
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Species Information

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Perennial herb from fleshy, scaly, underground shoots; stems 4-55 cm tall, short stiff-hairy in lines below, glandular short stiff-hairy above (in inflorescence), often with fleshy winter buds at base.
Lanceolate or narrowly elliptic to egg-shaped, 1-5.5 (6.5) cm long, 0.4-2.4 cm wide, entire to slightly toothed, usually clasping, glabrous, margins fringed with short, stiff hairs; more or less unstalked.
Inflorescence erect, sometimes nodding in bud, glandular; hypanthium 0.8-1.4 mm long; petals 2.2-5 (7) mm long, white or rarely pink, notched at tip; sepals 1.2-3.5 mm long; anthers 0.3-0.8 mm long; ovaries 0.9-3 cm long, densely hairy with short, stiff and glandular hairs; styles 1.6-2.8 mm long; stigmas club-shaped, rarely somewhat head-shaped.
Capsules, 2-5.5 (7) cm long, 1.5-3 mm wide, densely short stiff-hairy and glandular; usually unstalked, sometimes stalks to 5 mm long; seeds 0.9-1.8 mm long, pimply, tuft of hairs white, 3-7 mm long, readily detaching.
Specimens from Crowsnest Pass may be from the Alberta side of the boundary, but the species should be sought in SE BC.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist meadows and streambanks in the montane zone; rare in SE BC, known only from Crowsnest Pass; E to PQ and NF and S to NM, CA and E OR.

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Epilobium drummondii Hausskn.
Epilobium glandulosum var. brionense Fernald
Epilobium scalare Fernald
Epilobium steckerianum Fernald

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References