Taxon Report

Leptosiphon croceus (Eastw.) J.M. Porter & L.A. Johnson

coast yellow leptosiphon

Print Report

Taxon Summary

Leptosiphon croceus, commonly known as coast yellow leptosiphon, is a annual herb in the Polemoniaceae that is found only in California. It occurs within Coastal bluff scrub, and Coastal prairie, growing at elevations from 10 to 150 meters. Leptosiphon croceus is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Leptosiphon croceus (Eastw.) J.M. Porter & L.A. Johnson
Common Name:	coast yellow leptosiphon
Family:	Polemoniaceae
Element Code:	PDPLM09170
USDA Plants Symbol:
Synonyms/Other Names:	Linanthus croceus Eastwood

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Apr-Jun	Apr-Jun
Elevation:	10-150 (35-490)
General Habitats:	Coastal bluff scrub, Coastal prairie
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G1
State Rank:	S1
State List:	CE
Fed List:	None
Other Status:	SB_UCBG
CRPR Changes:

Occurrence Data from the CNDDB


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

Location


California Endemic: True
California Counties and Islands: Name (Code)
San Mateo (SMT)
Quads: Name (Quad Code)
Montara Mountain (3712254)

Threat List Data from the CNDDB


Threat List Total:	5
EOs with Threat Listed:	Total EOs	% of EOs
	1	100 %
Development	1	100%
Erosion/runoff	1	100%
Foot traffic/trampling	1	100%
Insufficient population/stand size	1	100%
Non-native plant impacts	1	100%

Notes



Threatened by development. Possibly threatened by foot traffic. See L. parviflorus in TJM (1993). See Botanical Gazette 37:442 (1904) 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 8 November 2025].