Castilleja ambigua var. humboldtiensis Calflora

Distribution by County 13016

Castilleja ambigua (Hook. & Arn.) T.I. Chuang & Heckard var. humboldtiensis (D.D. Keck) J.M. Egger

Humboldt bay owl's-clover

Castilleja ambigua var. humboldtiensis is an annual herb (hemiparasitic) that is native to California, and endemic (limited) to California.

California Rare Plant Rank: 1B.2 (rare, threatened, or endangered in CA and elsewhere).

Record Count by County


Humboldt: 80	Marin: 12	Mendocino: 7

Suggested Citation

Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2025. The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/ (Accessed: 11/07/2025).