Taxon Report

Galium serpenticum Dempster ssp. warnerense Dempster & Ehrend.

Warner Mountains bedstraw

Print Report

Taxon Summary

Galium serpenticum ssp. warnerense, commonly known as Warner Mountains bedstraw, is a perennial rhizomatous herb in the Rubiaceae that is found in California and elsewhere. It occurs within Meadows and seeps, Pinyon and juniper woodland, and Subalpine coniferous forest, growing at elevations from 1450 to 2750 meters. Galium serpenticum ssp. warnerense is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Galium serpenticum Dempster ssp. warnerense Dempster & Ehrend.
Common Name:	Warner Mountains bedstraw
Family:	Rubiaceae
Element Code:	PDRUB0N1Y8
USDA Plants Symbol:	GASEW
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: Jun-Jul	Jun-Jul
Elevation:	1450-2750 (4755-9025)
General Habitats:	Meadows and seeps, Pinyon and juniper woodland, Subalpine coniferous forest
Microhabitat:	Rocky, Talus
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G4G5T2T3
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_UCSC; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	11
Element Occurrence Ranks:
Excellent (A)	6
Good (B)	3
Fair (C)	1
Poor (D)	0
None (X)	0
Unknown (U)	1

Location


California Endemic: False
California Counties and Islands: Name (Code)
Modoc (MOD)
Quads: Name (Quad Code)
Mt. Bidwell (4112082), Willow Ranch (4112083)

Threat List Data from the CNDDB


Threat List Total:	6
EOs with Threat Listed:	Total EOs	% of EOs
	9	82 %
Grazing	6	54%
Non-native plant impacts	4	36%
ORV activity	2	18%
Erosion/runoff	2	18%
Recreational use (non-ORV)	1	9%
Road/trail construction/maint.	1	9%

Notes



Known in CA only from the Warner Mtns. Endangered in OR. Possibly threatened by grazing. See Brittonia 17:325 (1965) for original description, and Flora of California 4(2):33-34 (1979) by L. Dempster for taxonomic treatment.
Threats:

Taxonomy:

Selected References

USFS Potential Species of Conservation Concern Profile

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 28 October 2025].