Taxon Report

Clarkia franciscana Lewis & Raven

Presidio clarkia

Print Report

Taxon Summary

Clarkia franciscana, commonly known as Presidio clarkia, is a annual herb in the Onagraceae that is found only in California. It occurs within Coastal scrub, and Valley and foothill grassland (serpentinite), growing at elevations from 25 to 335 meters. Clarkia franciscana is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Clarkia franciscana Lewis & Raven
Common Name:	Presidio clarkia
Family:	Onagraceae
Element Code:	PDONA050H0
USDA Plants Symbol:	CLFR3
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: May-Jul	May-Jul
Elevation:	25-335 (80-1100)
General Habitats:	Coastal scrub, Valley and foothill grassland
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G1
State Rank:	S1
State List:	CE
Fed List:	FE
Other Status:	SB_UCBG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	4
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	2
Fair (C)	1
Poor (D)	0
None (X)	1
Unknown (U)	0

Location


California Endemic: True
California Counties and Islands: Name (Code)
Alameda (ALA), San Francisco (SFO)
Quads: Name (Quad Code)
Oakland East (3712272), San Francisco North (3712274)

Threat List Data from the CNDDB


Threat List Total:	7
EOs with Threat Listed:	Total EOs	% of EOs
	3	75 %
Foot traffic/trampling	3	75%
Non-native plant impacts	3	75%
Road/trail construction/maint.	2	50%
Development	1	25%
ORV activity	1	25%
Other	1	25%
Recreational use (non-ORV)	1	25%

Notes



Threatened by Army activities, vehicles, urbanization and non-native plants. See Brittonia 10:7-13 (1958) for original description, and Madroño 39(1):1-7 (1992) for information on ALA Co. occurrence.
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 31 January 2025].