Trifolium siskiyouense, the Siskiyou clover, is a clover species endemic to the Klamath Mountains in the western United States.
Description Trifolium siskiyouenseis a glabrous, perennial herb with thickened roots but no rhizomes. The leaves are trifoliate with lanceolate stipules; the leaflets are elliptic to oblanceolate, up to long. The flowers are white to cream-colored.Jepson Flora ProjectGillett, John Montague. 1980. Taxonomy of Trifolium (Leguminosae). V. The perennial species of section Involucrarium. Canadian Journal of Botany 58: 1425–1448.Isely, Duane. 1998. Native and Naturalized Leguminosae (Fabaceae) of the United States 936.Zohary, M. & D. Heller. 1984. Genus ~Trifolium~ i–x, 1–606. Israel Academy of Sciences and Humanities, Jerusalem.
Distribution and habitat The plant species is native to northwestern California and southwestern Oregon, in the Klamath Mountains. It is reported from only 5 counties: Shasta and Siskiyou Counties in California; and Josephine, Douglas and Jackson Counties in Oregon.BONAP's (Biota of North America Program) North American Plant Atlas
The type specimen was collected in 1904 near Grants Pass in Josephine County, Oregon. Part of its range is protected within the Klamath National Forest.
The plant grows in wet mountain meadows at elevations of .
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