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A Revision of the Genus Wislizenia (Capparidaceae) Based on Population Studies

Sue Keller
Brittonia
Vol. 31, No. 3 (Jul. - Sep., 1979), pp. 333-351
Published by: Springer on behalf of the New York Botanical Garden Press
Stable URL: http://www.jstor.org/stable/2806125
Page Count: 19
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A Revision of the Genus Wislizenia (Capparidaceae) Based on Population Studies
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Abstract

Morphological and cytological studies of mass collections from the southwestern United States and Baja California, and morphological studies on herbarium specimens from these areas and northern Mexico have been used to solve a taxonomic problem within the genus Wislizenia. Canonical analysis of morphological data from mass collections separates three geographic groups from: California, Baja California, and states east of California. A similar analysis of herbarium specimens collected throughout the range of Wislizenia refracta confirms the reality of these groups, for which the status of subspecies is proposed: 1) subsp. californica from the California central valley, 2) subsp. palmeri from Baja California and the Sonoran coast, and 3) subsp. refracta from states east of California. This taxonomic treatment differs from any of the varied previous ones. Chromosome numbers for six of the mass collections were found to be n = 20, in agreement with other reports.

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