Taxon Report

Collomia diversifolia Greene

serpentine collomia

Print Report

Taxon Summary

Collomia diversifolia, commonly known as serpentine collomia, is a annual herb in the Polemoniaceae that is found only in California. It occurs within Chaparral, and Cismontane woodland, growing at elevations from 200 to 600 meters. Collomia diversifolia is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification


Scientific Name:	Collomia diversifolia Greene
Common Name:	serpentine collomia
Family:	Polemoniaceae
Element Code:	PDPLM02020
USDA Plants Symbol:	CODI2
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: May-Jun	May-Jun
Elevation:	200-600 (655-1970)
General Habitats:	Chaparral, Cismontane woodland
Microhabitat:	Gravelly (sometimes), Rocky (sometimes), Serpentine (sometimes)
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.3
Global Rank:	G4
State Rank:	S4
State List:	None
Fed List:	None
Other Status:	SB_UCSC
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	0
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	0

Location


California Endemic: True
California Counties and Islands: Name (Code)
Colusa (COL), Contra Costa (CCA), Glenn (GLE), Humboldt (HUM), Lake (LAK), Marin (MRN), Mendocino (MEN), Napa (NAP), Orange (ORA), Shasta (SHA), Sonoma (SON), Stanislaus (STA), Tehama (TEH), Yolo (YOL)
Quads: Name (Quad Code)
Aetna Springs (3812264), Benmore Canyon (3912215), Capell Valley (3812242), Chiles Valley (3812253), Clayton (3712188), Copper Mtn. (3712143), Crockett Peak (3912247), Detert Reservoir (3812265), Duncans Mills (3812341), Fouts Springs (3912236), Gilmore Peak (3912235), Hopland (3812381), Hough Springs (3912225), Jericho Valley (3812274), Knoxville (3812273), Leesville (3912224), Middletown (3812275), Mt. Boardman (3712144), Pony Buck Peak (4012331), Potato Hill (3912237), Riley Ridge (3912286), Salt Canyon (3912213), San Quentin (3712284), San Rafael Mtn. (3411967), Sitton Peak (3311754), St. Helena (3812254), St. John Mtn. (3912246), Stonyford (3912245), The Geysers (3812277), Walter Springs (3812263), Whispering Pines (3812276), Wilbur Springs (3912214), Willow Creek (4012386), Wilson Valley (3812284)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	0 %

Notes



Possibly threatened by wind energy development and vehicles.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 5 February 2025].