Taxon Details

Chorizanthe cuspidata var. villosa

woolly-headed spineflower

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Taxon Summary:

Chorizanthe cuspidata var. villosa, commonly known as woolly-headed spineflower, is a annual herb in the Polygonaceae that is found only in California. It occurs within Coastal dunes, Coastal prairie, and Coastal scrub, growing at elevations from 3 to 60 meters. Chorizanthe cuspidata var. villosa is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Chorizanthe cuspidata Wats. var. villosa (Eastw.) Munz
Common Name: woolly-headed spineflower
Family:	Polygonaceae
Element Code:	PDPGN04082
USDA Plants Symbol:	CHCUV
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G2T2
State Rank:	S2
Other Status:
CRPR Changes:
Add Date:	1994-01-01
Date Edited:	2021-10-04

Ecology and Life History

Lifeform: annual herb

Blooming Period: May-Jul(Aug)

Elevation:
3 - 60 meters
10 - 195 feet

General Habitats:

Coastal dunes
Coastal prairie
Coastal scrub

Microhabitat Details:

Microhabitat:

Sandy

Notes

Notes: Threatened by agriculture, development and non-native plants. See C. cuspidata in The Jepson Manual. See Bulletin of the Torrey Botanical Club 30:485 (1903) for original description, and Phytologia 66(2):127-130 (1989) for taxonomic treatment.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	8
	Total EOs	% of EOs
EOs with Threat Listed:	9	53 %
Non-native plant impacts	7	41%
Agriculture	2	11%
Development	1	5%
Disking	1	5%
Foot traffic/trampling	1	5%
Grazing	1	5%
Mining	1	5%
Wood cutting or brush clearing	1	5%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					17
A	B	C	D	X	U
0	7	1	0	0	9

Occurrence Status:
Historical >20 Years	10
Recent <=20 Years	7

Presence:
Presumed Extant	17
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Marin (MRN), Sonoma (SON)

Quads: Name (Quad Code)
Bodega Head (3812331), Drakes Bay (3812218), Plantation (3812353), Tomales (3812228), Valley Ford (3812238)

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.

Regional Map

Map

Presumed Extant

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CNPS Rare Plant Inventory