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Plant Profile

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 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

Conservation Actions

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

09/01/2020

Based on an September 2020 extract of the California Plant Rescue Database, Rae Selling Berry Seed Bank & Plant Conservation Program holds 1 accessions of Epilobium siskiyouense in orthodox seed collection. There are as many as 141 seeds of this species in their collection - although some may have been used for curation testing or sent to back up.

08/05/2020

Based on an August 2020 extract of the California Plant Rescue Database, Rae Selling Berry Seed Bank & Plant Conservation Program has collected 1 seed accessions of Epilobium siskiyouense from 1 plant occurrences listed in the California Natural Diversity Database. These collections together emcompass an unknown number of maternal plants