Tetradymia

Tetradymia is a genus of North American shrubs in the groundsel tribe within the sunflower family.^[1][2][3][4] Horsebrush is a common name for plants in this genus.^[5]

Species^[6][7][8][9]

• Tetradymia argyraea - CA (Riverside + San Bernardino Cos), AZ (Mohave Co), NV (Clark Co)
• Tetradymia axillaris - CA AZ NV UT
• Tetradymia canescens - BC WA ID MT WY OR CA NV UT CO AZ NM
• Tetradymia comosa - CA NV
• Tetradymia filifolia - NM
• Tetradymia glabrata - CA NV UT OR ID
• Tetradymia nuttallii - NV UT CO WY
• Tetradymia spinosa - CA OR NV ID UT MT WY CO NM
• Tetradymia stenolepis - CA NV AZ
• Tetradymia tetrameres - NV CA (Mono Co)

Formerly included^[6]

Tetradymia
Tetradymia axillaris
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Asterales
Family:	Asteraceae
Subfamily:	Asteroideae
Tribe:	Senecioneae
Genus:	Tetradymia DC.
Type species
Tetradymia canescens[1] DC.

See Lepidospartum and Psathyrotes.

• Tetradymia ramosissima - Psathyrotes ramosissima
• Tetradymia squamata - Lepidospartum squamatum