SHOCKEY, KARA M.* AND MICHAEL A. VINCENT. Department of Botany, Iowa State University, Ames, IA 50011. - A revision of the Trifolium polymorphum (Fabaceae) species complex.
In the most recent monograph of the genus Trifolium, Zohary and
Heller circumscribe Trifolium polymorphum in a broad sense,
describing the species as ocurring in Texas, Arkansas and Louisiana as
well as southern Peru and Chile to the coastal areas of southern
Brazil and Argentina. This broad distribution suggested that the
species was actually a species complex composed of more than one
species. A morphological study of the species complex revealed that
several species can easily be circumscribed, and these morphologically
distinct entities also have distinct geographical distributions.
These include a northern Chilean-North American species, several
others from western South America, as well as several from southern
and southeastern South America.
Key words: Fabaceae, new species, North America, revision, South America, Trifolium polymorphum