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

Epilobium mirabile Trel. ex Piper
hairy-stemmed willowherb (Olympic Mountain willowherb)
Onagraceae (Evening Primrose family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #46943)

E-Flora BC Static Map
Distribution of Epilobium mirabile
Click here to view the full interactive map and legend
Details about map content are available here
Click on the map dots to view record details.

Species Information

Click on the image below to view an expanded illustration for this species.

Perennial herb from compact, fleshy underground stolon; stems often clumped, 7-30 cm tall, densely short stiff-hairy, lacking lines of hairs, with fleshy winter buds at base.
Leathery, egg-shaped and blunt-tipped below, narrowly egg-shaped and pointed above, 1.5-3 cm long, 7-12 mm wide, sparsely short stiff-hairy, also densely hairy on midrib and margins; unstalked.
Inflorescence erect; petals 3.8-5 mm long, white and often red-tinged at tips; sepals 2-3.2 mm long, sparsely glandular-hairy, often purplish-red; anthers 0.4-0.6 mm long; ovaries 1-1.8 cm long, stiff-short- and glandular-hairy; styles 2-2.3 mm long; stigmas nearly globe-shaped.
Capsules, 3-4.5 cm long, 2-3 mm wide; seeds narrowly egg-shaped, 1.7-2.2 mm long, tuft of hairs white, 10-15 mm long, readily detaching.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist scree slopes in the montane and subalpine zones; rare in SW BC in the Cascade Mountains; E to SW AB and S to MT and W WA.

Source: The Illustrated Flora of British Columbia

Additional Notes

"Epilobium mirabile is a bicentral regional endemic of the Cascade and Olympic Mountains in northwest Washington and adjacent B.C, and with an eastern centre of populations in the Rocky Mountains in southern Alberta and northern Montana." (Bjork 2008).


Bjork, Curtis. 2008. Noteworthy plants from the Cascade Lee, British Columbia. Botanical Electronic News. No. 401 (November 26, 2008). Available: http://www.ou.edu/cas/botany-micro/ben/ben401.html.


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.

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References