Taxon  Report   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
© 2002 California Native Plant Society
Photos from
CalPhotos / Calflora
Castilleja ambigua var. humboldtiensis
© 2017 Lucinda Adamson
Castilleja ambigua var. humboldtiensis
© 2005 Doreen L. Smith
Castilleja ambigua var. humboldtiensis, a dicot, is an annual herb that is native to California, is endemic (limited) to California.
CNPS Rare Plant Rank: 1B.2 (rare, threatened, or endangered in CA and elsewhere).   8th Edition

Interactive Distribution Map

Observation Hotline
(observation details)

point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations
Castilleja ambigua var. humboldtiensis
© 2016 Taylor McCracken
Communities: Coastal Salt Marsh, wetland-riparian

Wetlands: Occurs usually in wetlands, occasionally in non wetlands

Habitat: salt-marsh, coastal

Name Status:
Accepted by CNPS

Alternate Names:
CNPS: Castilleja ambigua ssp. humboldtiensis
More information about  Castilleja ambigua var. humboldtiensis
Nursery / seed vendor availability from CNPLX
Commercial availability unknown.
Landscaping information from Calscape
Photos on   /   Google Images

Records from the Consortium of California Herbaria

Search (Flora of North America)

website references from Google

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]. 2019. Berkeley, California: The Calflora Database [a non-profit organization]. Available:   (Accessed: Jan 15, 2019).