CNPS Inventory Plant Detail

Castilleja ambigua var. humboldtiensis

Common Name:	Humboldt Bay owl's-clover
Family:	Orobanchaceae
Synonyms:	Castilleja ambigua ssp. humboldtiensis
Element Code:	PDSCR0D402
Full Name:	Castilleja ambigua (Hook. & Arn.) T.I. Chuang & Heckard var. humboldtiensis (D.D. Keck) J.M. Egger
USDA PLANTS Symbol:	CAAMH

Biology
Lifeform: annual herb (hemiparasitic) Blooming Period: April - August Habitat: • Marshes and swamps (coastal salt)

Rarity Status
CA Rare Plant Rank: 1B.2 Rare, threatened, or endangered in California and elsewhere .2: Fairly endangered in California Federal Listing Status: Not Listed State Listing Status: Not Listed State Rank: S2.2 S2: Imperiled. .2: Threatened. Global Rank: G4T2 T2: Imperiled. G4: (species) Apparently secure, considering populations outside California.

Occurrence Data from DFG
California Natural Diversity Database

Total # of Known Element Occurrences: 27
Element Occurrence Ranks:

A B C D X U

5 11 2 0 0 9

Population Status:

Historic >20 yrs	Recent <=20 yrs
11	16

Presence:

Present Extant	Possibly Extirpated	Extirpated
27	0	0

Notes

Threatened by coastal development and non-native plants. See Proceedings of the American Academy of Arts and Sciences IV 16:536 (1927) for original description, Phytologia 90(1):63-82 (2008) for revised nomenclature, and Madroño 45(4):326 for distribution information.
To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page.
Date Added: 1974-01-01
Last Update: 2013-01-03

Location

Elevation: 0 - 3 meters

California Endemic: yes

States: California

California Counties and Islands: name (code)
Humboldt (HUM), Mendocino (MEN), Marin (MRN)

Quads: name (DWR code) USGS code
Tomales (485B) 38122B8, Inverness (485D) 38122A7, Point Arena (537B) 38123H6, Mathison Peak (568C) 39123C6, Mendocino (569D) 39123C7, Fields Landing (654B) 40124F2, Cannibal Island (655A) 40124F3, Arcata North (672A) 40124H1, Tyee City (672B) 40124H2, Eureka (672C) 40124G2, Arcata South (672D) 40124G1, Rodgers Peak (689A) 41124B1

Notes:

Definitions of codes preceding a county and/or quad:
*		Presumed extirpated
?		Uncertain about distribution or identity
?*		Uncertain about distribution, but presumed extirpated if once present
(?)		Occurrence confirmed, but possibly extirpated

Species may be present in other areas where conditions are favorable.

Presumed Extant

Presumed Extirpated or Unknown

1201

Links to Leading Resources of Taxon Information
USDA PLANTS Calflora CalPhotos Consortium of California Herbaria California Department of Fish and Game: CNDDB Quick Viewer

Suggested Citation
California Native Plant Society (CNPS). Inventory of Rare and Endangered Plants (online edition, v8-01a). California Native Plant Society. Sacramento, CA. Accessed on .

-123.75,39.25