Siskiyou Willowherb (Epilobium siskiyouense)

Photo Credit: Julie Kierstead Nelson

Global Rank: G3 - Vulnerable
Legal Status: N/A
Family: Onagraceae
State: CA, OR
Nature Serve ID: 147998
Lifeform: Subshrub, Forb/herb
Date Inducted in National Collection:

Description:

Epilobium siskiyouense is a rare species of flowering plant in the evening primrose family known by the common names Siskiyou willowherb and Siskiyou fireweed (though it is not a true fireweed). Epilobium siskiyouense is a small, clumping subshrub growing scaly, often densely hairy and glandular from a woody caudex reaching up to about 25 centimeters in maximum height. The leaves are lance-shaped to oval and under 3 centimeters long. The glandular inflorescence bears bright to deep pink flowers with petals 1 or 2 centimeters long and blooms from June through September. The fruit is a hairy capsule reaching up to 4. 5 centimeters in length. [Calscape]

Where is Siskiyou Willowherb (Epilobium siskiyouense) located in the wild?

Habitat:

Epilobium siskiyouense grows in mountain habitats, including alpine talus and subalpine coniferous forest, often on serpentine soils. [CNPS]

Distribution:

Epilobium siskiyouense is endemic to the Klamath Mountains of far northern California and southern Oregon. Aproximately 56 plants have been found in Shasta, Siskiyou and Trinity Counties in California. {CNPS]

States & Provinces:

Siskiyou Willowherb can historically be found in California, Oregon

Which CPC Partners conserve Siskiyou Willowherb (Epilobium siskiyouense)?

Santa Barbara Botanic Garden

Not Sponsored

Assigned 06/13/17

Rae Selling Berry Seed Bank & Plant Conservation Program

Not Sponsored

Assigned 11/07/23

CPC's Plant Sponsorship Program provides long term stewardship of rare plants in our National Collection. We are so grateful for all our donors who have made the Plant Sponsorship Program so successful. We are in the process of acknowledging all our wonderful plant sponsorship donors on our website. This is a work in progress and will be updated regularly.

Conservation Actions

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Siskiyou Willowherb (Epilobium siskiyouense) Characteristics

Nomenclature

Taxon	Epilobium siskiyouense
Authority	(Munz) Hoch & Raven
Family	Onagraceae
CPC Number	1609
ITIS	27325
USDA	EPSI2
Duration	Perennial
Common Names	Siskiyou fireweed \| Siskiyou willowherb \| Siskiyou rock-fringe
Associated Scientific Names	Epilobium siskiyouense \| Epilobium obcordatum ssp. siskiyouense \| Epilobium obcordatum var. laxum
Distribution	Epilobium siskiyouense is endemic to the Klamath Mountains of far northern California and southern Oregon. Aproximately 56 plants have been found in Shasta, Siskiyou and Trinity Counties in California. {CNPS]

State Rank

State	State Rank
California	S3
Oregon	S2

Ecological Relationships

Photos

Photo Credit: Julie Kierstead Nelson

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