Species Details

Chorizanthe valida

Sonoma spineflower

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Scientific Name:
Chorizanthe valida Wats.
Common Name:
Sonoma spineflower
Family: Polygonaceae
Element Code: PDPGN040V0
USDA Plants Symbol: CHVA
Synonyms/Other Names:
CA Rare Plant Rank: 1B.1
Fed List: FE (1992-06-22)
State List: CE (1990-01-01)
Global Rank: G1
State Rank:
S1
Other Status: SB_CalBG/RSABG
CRPR Changes:
Add Date: 1974-01-01
Date Edited: 2021-05-26
Lifeform: annual herb
Blooming Period: Jun-Aug
JFMAMJJASOND
Elevation:
10 - 305 meters
35 - 1000 feet
General Habitats:
  • Coastal prairie (sandy)
Microhabitat Details:
Microhabitat:
Notes:
Thought extinct for 77 years; only known extant occurrence was rediscovered in 1980 at Pt. Reyes NS. Experimental introduction work ongoing as of 2000. Closely related to C. pungens. See Proceedings of the American Academy of Arts and Sciences 12:271 (1877) for original description, Phytologia 66(2):132-134 (1989) for taxonomic treatment, Fremontia 18(1):17-18 (1990) for species account, and MadroƱo 39(4):271-280 (1992) and 40(4):285-288 (1993) for discussion of grazing effects.
Threats:
Taxonomy:
Threat List Total: 4
Total EOs % of EOs
EOs with Threat Listed: 3 50 %
THREAT LIST:
Grazing 3 50%
Other 2 33%
Road/trail construction/maint. 1 16%
Non-native plant impacts 1 16%
Total Occurrences: 6
Element Occurrence Ranks:
A B C D X U
0 3 0 0 3 0
Occurrence Status:
Historical >20 Years 3
Recent <=20 Years 3
Presence:
Presumed Extant 3
Possibly Extirpated 3
Presumed Extirpated 0
California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Marin (MRN), Sonoma (SON)*
Quads: Name (Quad Code)
Arched Rock (3812342), Drakes Bay (3812218), Fort Ross (3812352)*, Petaluma (3812226)?*, Petaluma River (3812225), Plantation (3812353), Sebastopol (3812247)*
Notes:
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.
Presumed Extant
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