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Taxon  Report  
Castilleja ambigua  Hook. & Arn.  ssp. humboldtiensis  (D. D. Keck) T. I. Chuang & Heckard
Humboldt bay owl's clover
Castilleja ambigua ssp. humboldtiensis is an annual herb (hemiparasitic) that is native to California, and endemic (limited) to California.
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial
Observation Search
~101 records in California
yellowone or more occurrences
within a 7.5-minute quadrangle
DJJJASONAFMM

Bloom Period
Parent: Castilleja ambigua
Genus: Castilleja
Family: Orobanchaceae  
(Scrophulariaceae)
Category: angiosperm  
PLANTS group:Dicot
Jepson eFlora section: eudicot

Wetlands: Occurs usually in wetlands, occasionally in non wetlands

Habitat: salt-marsh, coastal

Communities: Coastal Salt Marsh, wetland-riparian

Name Status:
Accepted by JEF + PLANTS
Alternate Names:
JEF + PLANTSOrthocarpus castillejoides var. humboldtiensis
CNPSCastilleja ambigua var. humboldtiensis
Information about  Castilleja ambigua ssp. humboldtiensis from other sources
Nursery availability from CNPLX
Commercial availability unknown.
Jepson eFlora

USDA PLANTS Profile (CAAMH)

Photos on Calflora

Photos on CalPhotos

Google Images

Photos on iNaturalist

ID Tips on PlantID.net


Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2025. The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 07/13/2025).