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

2005 Doreen L. Smith
Biology Glossary
Rarity Status Glossary
Occurrence Data from CDFW
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences: 31
  • Element Occurrence Ranks:
    A B C D X U
    5 11 4 0 0 11
  • Population Status:
    >20 yrs
    <=20 yrs
    9 22
  • Presence:
    Present Extant Possibly Extirpated Presumed Extirpated
    31 0 0
Notes Glossary
  • Threatened by coastal development and non-native plants. See C. ambigua ssp. humboldtiensis in TJM 2. 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 MadroƱo 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: 2013-05-21
Location Glossary
  • Elevation: 0 - 3 meters
  • California Endemic: yes
  • Other States:
  • California Counties and Islands:   name (code)
    Humboldt (HUM),  Mendocino (MEN),  Marin (MRN)
  • Quads:   name (DWR code) USGS code
    Tomales (485B) 3812228,  Inverness (485D) 3812217,  Point Arena (537B) 3812386,  Mathison Peak (568C) 3912336,  Mendocino (569D) 3912337,  Fields Landing (654B) 4012462,  Cannibal Island (655A) 4012463,  Ferndale (655D) 4012453,  Arcata North (672A) 4012481,  Tyee City (672B) 4012482,  Eureka (672C) 4012472,  Arcata South (672D) 4012471,  Rodgers Peak (689A) 4112421
  • 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. This data should NOT be substituted for pre-project review or for on-site surveys.
Presumed Extant Presumed Extirpated or Unknown 1201
Links to Leading Resources of Taxon Information
Suggested Citation
California Native Plant Society, Rare Plant Program. . Inventory of Rare and Endangered Plants of California (online edition, v8-03). Website [accessed ].

3812228=Tomales (485B) 3812228;3812217=Inverness (485D) 3812217;3812386=Point Arena (537B) 3812386;3912336=Mathison Peak (568C) 3912336;3912337=Mendocino (569D) 3912337;4012462=Fields Landing (654B) 4012462;4012463=Cannibal Island (655A) 4012463;4012453=Ferndale (655D) 4012453;4012481=Arcata North (672A) 4012481;4012482=Tyee City (672B) 4012482;4012472=Eureka (672C) 4012472;4012471=Arcata South (672D) 4012471;4112421=Rodgers Peak (689A) 4112421