Tetradymia is a genus of North American shrubs in the groundsel tribe within the sunflower family.Candolle, Augustin Pyramus de, 1838. Prodromus Systematis Naturalis Regni Vegetabilis 6: 440 in LatinTropicos, Tetradymia DC. Horsebrush is a common name for plants in this genus.
SpeciesFlann, C (ed) 2009+ Global Compositae Checklist The Plant List search for TetradymiaBiota of North America Program 2013 county distribution mapsStrother, J. L. 1974. Taxonomy of Tetradymia (Compositae: Senecioneae). Brittonia 26: 177–202.
Formerly included See Lepidospartum and Psathyrotes. Tetradymia ramosissima - Psathyrotes ramosissima Tetradymia squamata - Lepidospartum squamatum
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