Taxon Report

Tetradymia tetrameres (Blake) Strother

dune horsebrush

Print Report

Taxon Summary

Tetradymia tetrameres, commonly known as dune horsebrush, is a perennial shrub in the Asteraceae that is found in California and elsewhere. It occurs within Great Basin scrub, growing at elevations from 1200 to 2135 meters. Tetradymia tetrameres is ranked 2B.2, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Tetradymia tetrameres (Blake) Strother
Common Name:	dune horsebrush
Family:	Asteraceae
Element Code:	PDAST950A0
USDA Plants Symbol:	TETE4
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial shrub
Blooming Period: (Jul)Aug	(Jul)Aug
Elevation:	1200-2135 (3935-7005)
General Habitats:	Great Basin scrub
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.2
Global Rank:	G4
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	SB_CalBG/RSABG
CRPR Changes:	changed from 2.2 to 2B.2 on 2013-06-12

Occurrence Data from the CNDDB


Total Occurrences:	10
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	1
Fair (C)	1
Poor (D)	0
None (X)	0
Unknown (U)	8

Location


California Endemic: False
California Counties and Islands: Name (Code)
Inyo (INY), Mono (MNO)
Quads: Name (Quad Code)
Alameda Well (3811817), Deep Springs Lake (3711831), Indian Meadows (3711886), Negit Island (3811911), Sulphur Pond (3811818)

Threat List Data from the CNDDB


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

Notes



See Proceedings of the Biological Society of Washington 35:176 (1922) for original description, and Brittonia 26:192 (1974) 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 1 November 2025].