Taxon Report

Collinsia antonina Hardham

San Antonio collinsia

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Taxon Summary

Collinsia antonina, commonly known as San Antonio collinsia, is a annual herb in the Plantaginaceae that is found only in California. It occurs within Chaparral, and Cismontane woodland, growing at elevations from 280 to 365 meters. Collinsia antonina is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Collinsia antonina Hardham
Common Name:	San Antonio collinsia
Family:	Plantaginaceae
Element Code:	PDSCR0H010
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Mar-May	Mar-May
Elevation:	280-365 (920-1200)
General Habitats:	Chaparral, Cismontane woodland
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S
CRPR Changes:	added to 1B on 2003-05-07

Occurrence Data from the CNDDB


Total Occurrences:	8
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	6

Location


California Endemic: True
California Counties and Islands: Name (Code)
Monterey (MNT)
Quads: Name (Quad Code)
Alder Peak (3512183), Bear Canyon (3612113), Bryson (3512171), Burnett Peak (3512172), Cosio Knob (3612112), Hames Valley (3512088), Jolon (3512182), Williams Hill (3512181)

Threat List Data from the CNDDB


Threat List Total:	3
EOs with Threat Listed:	Total EOs	% of EOs
	3	38 %
Other	2	25%
Foot traffic/trampling	1	12%
Grazing	1	12%

Notes



Known from fewer than 10 occurrences. Possibly threatened by grazing and road maintenance. As treated here, includes sspp. antonina and purpurea. A synonym of C. parryi in The Jepson Manual. See Leaflets of Western Botany 10:133-135 (1964) for original description, and Madroño 49(4):295-297 (2002) for discussion of taxonomic distinctiveness.
Threats:

Taxonomy:

Selected References

CRPR List Addition on 2003-05-07

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 26 November 2025].