Taxon Report

Collinsia corymbosa Herder

round-headed collinsia

Print Report

Taxon Summary

Collinsia corymbosa, commonly known as round-headed collinsia, is a annual herb in the Plantaginaceae that is found only in California. It occurs within Coastal dunes, growing at elevations from 0 to 20 meters. Collinsia corymbosa is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Collinsia corymbosa Herder
Common Name:	round-headed collinsia
Family:	Plantaginaceae
Element Code:	PDSCR0H060
USDA Plants Symbol:	COCO2
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Apr-Jun	Apr-Jun
Elevation:	0-20 (0-65)
General Habitats:	Coastal dunes
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G1
State Rank:	S1
State List:	None
Fed List:	None
Other Status:	SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	13
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	1
Fair (C)	0
Poor (D)	0
None (X)	2
Unknown (U)	10

Location


California Endemic: True
California Counties and Islands: Name (Code)
Humboldt (HUM), Marin (MRN)?, Mendocino (MEN), San Francisco (SFO)*, San Mateo (SMT), Santa Clara (SCL)
Quads: Name (Quad Code)
Bolinas (3712286), Eureka (4012472), Fort Bragg (3912347), Inglenook (3912357), Palo Alto (3712242), San Francisco North (3712274)*, San Francisco South (3712264)

Threat List Data from the CNDDB


Threat List Total:	4
EOs with Threat Listed:	Total EOs	% of EOs
	5	38 %
Development	4	30%
Foot traffic/trampling	1	7%
Non-native plant impacts	1	7%
ORV activity	1	7%

Notes



Scattered distribution. Need quads for HUM Co. and for "Russian colony" (SON Co.). May intergrade with C. bartsiifolia var. bartsiifolia. Possibly threatened by foot traffic.
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 23 November 2025].