Taxon Report

Leptosiphon floribundus (A. Gray) J. M. Porter & L. A. Johnson ssp. hallii (Jeps.) J.M. Porter & L.A. Johnson

Santa Rosa Mountains leptosiphon

Print Report

Taxon Summary

Leptosiphon floribundus ssp. hallii, commonly known as Santa Rosa Mountains leptosiphon, is a perennial herb in the Polemoniaceae that is found only in California. It occurs within Pinyon and juniper woodland, and Sonoran desert scrub, growing at elevations from 1000 to 2000 meters. Leptosiphon floribundus ssp. hallii is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.

Classification


Scientific Name:	Leptosiphon floribundus (A. Gray) J. M. Porter & L. A. Johnson ssp. hallii (Jeps.) J.M. Porter & L.A. Johnson
Common Name:	Santa Rosa Mountains leptosiphon
Family:	Polemoniaceae
Element Code:	PDPLM090J3
USDA Plants Symbol:
Synonyms/Other Names:	Linanthus floribundus (Gray) Mlkn. ssp. hallii (Jeps.) Mason

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: May-Jul(Nov)	May-Jul(Nov)
Elevation:	1000-2000 (3280-6560)
General Habitats:	Pinyon and juniper woodland, Sonoran desert scrub
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.3
Global Rank:	G4T1T2
State Rank:	S1S2
State List:	None
Fed List:	None
Other Status:	BLM_S; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	6
Element Occurrence Ranks:
Excellent (A)	0
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)
Riverside (RIV), San Diego (SDG)
Quads: Name (Quad Code)
Bucksnort Mtn. (3311645), Clark Lake NE (3311643), Collins Valley (3311644), Fonts Point (3311632), Martinez Mtn. (3311653), Toro Peak (3311654), Valerie (3311652)

Threat List Data from the CNDDB


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

Notes



Known only from the Santa Rosa Mtns. Possibly threatened by recreational activities. A synonym of Linanthus floribundus ssp. hallii in The Jepson Manual. See 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 24 October 2025].