Author:
Bain John F.,Denford K. E.
Abstract
Flavonoid characters are presented for seven "phases" (sensu Barkley 1962) of Senecio streptanthifolius Greene and four related species, Seneciopauperculus Michx., Senecio multilobatus T. & G., Senecio canus Hook., and Senecio neomexicaiius A. Gray. Evidence from the study of flavonoid characters supports the division of S. streptanthifolius into two subgroups; the subgroup composed of the suksdorfii and laetiflorus phases is apparently related to S. pauperculus. In the other subgroup, three of five phases have apparently arisen through a combination of hybridization and polyploidy or introgression. While the two subgroups are thought to have originated during the Pliocene, the within-subgroup hybridization events are hypothesized to have occurred in Pleistocene or post-Pleistocene times.
Publisher
Canadian Science Publishing
Cited by
6 articles.
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