Home/Species/ Siskiyou Mountains Willowherb

Epilobium rigidum

Hausskn.

Siskiyou Mountains Willowherb

G3Vulnerable (G3G4) Found in 10 roadless areas NatureServe Explorer →

G3VulnerableGlobal Rank

Identity

Unique IDELEMENT_GLOBAL.2.148787

Element CodePDONA060V0

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryVascular Plant

Endemicendemic to a single nation

KingdomPlantae

PhylumAnthophyta

ClassDicotyledoneae

OrderMyrtales

FamilyOnagraceae

GenusEpilobium

Concept Reference

Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

Conservation Status

Review Date2003-07-14

Change Date2003-07-14

Edition Date1999-12-28

Edition AuthorsVrilakas, Sue

Range Extent250-20,000 square km (about 100-8000 square miles)

Number of Occurrences21 - 80

Rank Reasons

This species is restricted geographically to four counties in two states where populations seem to be healthy. There does not appear to be any threats, and it can tolerate mild disturbance. Many of the populations exist in the Kalmiopsis Wilderness Area and other undeveloped areas.

Range Extent Comments

Epilobium rigidum can be found in Del Norte and Siskiyou Counties, California and the adjacent counties of Josephine and Curry Counties in Oregon.

Occurrences Comments

There are 55 occurrences reported to the Oregon Natural Heritage Program (1999) with more sites probably not reported. California Natural Diversity Data Base (1999) does not computer track this species and considers it to be "rare, but found in sufficient numbers and distributed widely enough that the potential for extinction is low at this time" and "not endangered".

Threat Impact Comments

Threats appear to be non-existent (Rolle pers. comm 1997), and it seems to tolerate moderate disturbance.

Ecology & Habitat

Habitat

Epilobium rigidum grows in rocky, open to brushy areas on serpentine soils, on ridges, upper slopes, trailsides, alluvial terraces, road cuts.

Other Nations (1)

United StatesN3

Province	Rank	Native
Oregon	S3	Yes
California	S3	Yes

Plant Characteristics

Economic Value (Genus)No

Roadless Areas (10)

California (8)

Area	Forest	Acres
Blue Creek Rare I	Six Rivers National Forest	12,134
Kelly	Six Rivers National Forest	5,195
Monkey Creek	Six Rivers National Forest	9,017
North Fork Smith	Six Rivers National Forest	37,898
Packsaddle	Six Rivers National Forest	3,862
Siskiyou	Klamath National Forest	54,039
Siskiyou B	Six Rivers National Forest	18,871
South Kalmiopsis	Six Rivers National Forest	321

Oregon (2)

Area	Forest	Acres
North Kalmiopsis	Siskiyou National Forests	91,560
South Kalmiopsis	Siskiyou National Forests	104,477

References (4)

California Natural Diversity Data Base. 1999. Special Plants List, June 1999. California Department of Fish and Game, Sacramento, CA. 119 pp.
Flora of North America Editorial Committee (FNA). 2021. Flora of North America north of Mexico. Vol. 10. Magnoliophyta: Proteaceae to Elaeagnaceae. Oxford Univ. Press, New York. xxiv + 456 pp.
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Rolle, Wayne. SW botanist, living in Ashland. Forest botanist for Rogue River and Siskiyou NF, 1989?-