Taxon Report

Leptosiphon jepsonii (D.W. Schemske & C. Goodwillie) Porter & Johnson

Jepson's leptosiphon

Print Report

Taxon Summary

Leptosiphon jepsonii, commonly known as Jepson's leptosiphon, is a annual herb in the Polemoniaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, and Valley and foothill grassland, growing at elevations from 100 to 500 meters. Leptosiphon jepsonii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Leptosiphon jepsonii (D.W. Schemske & C. Goodwillie) Porter & Johnson
Common Name:	Jepson's leptosiphon
Family:	Polemoniaceae
Element Code:	PDPLM09140
USDA Plants Symbol:	LEJE
Synonyms/Other Names:	Linanthus jepsonii D.W. Schemske & C. Goodwillie

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Mar-May	Mar-May
Elevation:	100-500 (330-1640)
General Habitats:	Chaparral, Cismontane woodland, Valley and foothill grassland
Microhabitat:	Volcanic (usually)
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G2G3
State Rank:	S2S3
State List:	None
Fed List:	None
Other Status:	SB_CalBG/RSABG; SB_USDA
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	51
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	4
Fair (C)	1
Poor (D)	1
None (X)	0
Unknown (U)	43

Location


California Endemic: True
California Counties and Islands: Name (Code)
Lake (LAK), Napa (NAP), Solano (SOL), Sonoma (SON), Yolo (YOL)
Quads: Name (Quad Code)
Aetna Springs (3812264), Calistoga (3812255), Capell Valley (3812242), Cazadero (3812351), Chiles Valley (3812253), Cordelia (3812222), Detert Reservoir (3812265), Glen Ellen (3812235), Jimtown (3812267), Kenwood (3812245), Mark West Springs (3812256), Middletown (3812275), Monticello Dam (3812251), Mount St. Helena (3812266), Napa (3812233), Rutherford (3812244), Santa Rosa (3812246), St. Helena (3812254), Walter Springs (3812263), Whispering Pines (3812276), Yountville (3812243)

Threat List Data from the CNDDB


Threat List Total:	8
EOs with Threat Listed:	Total EOs	% of EOs
	8	16 %
Agriculture	3	5%
Non-native plant impacts	3	5%
ORV activity	2	3%
Other	1	1%
Road/trail construction/maint.	1	1%
Foot traffic/trampling	1	1%
Improper burning regime	1	1%
Mining	1	1%

Notes



Threatened by habitat conversion and non-native plants. Similar to L. parviflorus. Not in The Jepson Manual. See Madroño 43(4):455 (1996) for original description, and Aliso 19(1):55-91 (2000) for revised nomenclature.
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 3 July 2025].