Taxon Report

Tetradymia tetrameres (Blake) Strother

dune horsebrush

Print Report



Species Description:
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
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)

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:
Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 22 January 2025].