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Revision of the Western North American Species of Aster Centering About Aster foliaceus Lindl.

1943; University of Notre Dame; Volume: 29; Issue: 2 Linguagem: Inglês

10.2307/2420804

1938-4238

Arthur Cronquist,

Archaeology and Natural History

This study is intended to include the western North American forms of Aster proper that are not entirely glabrous and have eglandular involucres, exclusive of the rigid forms centering about Aster commutatus T. & G. and Aster radulinus Gray, of such chartaceous-involucrate forms as Aster alpinus L. and Aster meritus A. Neis., and of such primarily eastern forms as Aster longifolius Lam. and Aster Lindley anus T. & G. that reach the edges of our range but in general do not form an integral part of our western Aster flora. By western North America is meant the area from the Rocky Mountains, exclusive of the Black Hills, to the Pacific Ocean, north of Mexico. The species which occur east of our range as well as within it are treated only with respect to western North America. As so delimited, the forms treated in this paper, with the possible exceptions of Aster coerulescens and Aster Greatai, constitute a wholly natural group.