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214d.3. Symphyotrichum Nees (subg. Symphyotrichum ) sect. Occidentales (Rydberg) G. L. Nesom, Phytologia. 77: 271. 1995.
Aster Linnaeus [unranked] Occidentales Rydberg, Fl. Colorado, 352. 1906
Perennials, eglandular; rhizomatous. Stems usually simple, sometimes ± branched. Heads radiate. Ray florets fewer than disc florets, in 1 series (conspicuous). Disc corollas ± ampliate, lobes erect. Pappi shorter than to equaling disc florets at flowering. x = 8.
Species 12 (12 in the flora): w North America.
SELECTED REFERENCE Allen, G. A. 1984. Morphological and cytological variation within the western North American Aster occidentalis complex (Asteraceae). Syst. Bot. 9: 175–191.
List of lower taxa
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