Calflora, a 501c3 non-profit
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 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: 71 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]. 2024. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 03/28/2024).