Isocoma acradenia var. eremophila
Phytologia 70: 82. 1991.
Basionym: Isocoma eremophila Greene Leafl. Bot. Observ. Crit. 1: 171. 1906
Synonyms: Haplopappus acradenius subsp. eremophilus (Greene) H. M. Hall Isocoma acradenia subsp. eremophila (Greene) R. M. Beauchamp
Revision as of 20:22, 16 December 2019 by FNA>Volume Importer
Leaf blades mostly 2.5–5 cm, margins pinnately toothed to pinnatifid. Involucres 6–8 m. Phyllary apices usually rounded, sometimes with weakly developed aristae. Florets 12–20. 2n = 12.
Phenology: Flowering (May–)Aug–Nov.
Habitat: Sandy soils, alkaline or salt flats, desert dunes, often with Saguaro-Prosopis-Larrea, Larrea, Atriplex, Yucca, or mixed shrubs
Elevation: (-15–)0–900(–1100) m
Distribution
Ariz., Calif., Nev., Utah, Mexico (Baja California, Sonora).
Discussion
For the most part, var. eremophila is geographically separate from var. acradenia. In southwestern Nevada many intergrades occur; in San Bernadino County, California, the two taxa appear to be contiguous with little or no intergradation. In the latter area, the taxa apparently are at different ploidy levels.
Selected References
None.
Lower Taxa
None.