Article
STRUCTURE, DEVELOPMENT, AND TAXONOMY IN THE GENUS LOPHOPHORA
Norman H. Boke,
Edward F. Anderson,
Norman H. Boke
Department of Botany and Microbiology, University of Oklahoma, Norman
Department of Biology, Whitman College, Walla Walla, Washington
Search for more papers by this authorEdward F. Anderson
Department of Botany and Microbiology, University of Oklahoma, Norman
Department of Biology, Whitman College, Walla Walla, Washington
Search for more papers by this authorNorman H. Boke,
Edward F. Anderson,
Norman H. Boke
Department of Botany and Microbiology, University of Oklahoma, Norman
Department of Biology, Whitman College, Walla Walla, Washington
Search for more papers by this authorEdward F. Anderson
Department of Botany and Microbiology, University of Oklahoma, Norman
Department of Biology, Whitman College, Walla Walla, Washington
Search for more papers by this authorThe authors acknowledge financial support from the National Science Foundation.
Abstract
Structural and developmental data indicate that Lophophora (Cactaceae) should be retained as a genus, which appears to be most closely related to Thelocactus (sensu lato). Within Lophophora morphological differences suggest that two species should be recognized. In the extensive northern population (Texas along the Río Grande to San Luis Potosí in Mexico) the tubercles are usually arranged as distinct ribs or elevated podaria, whereas in the restricted southern population (limited to the Mexican State of Querétaro) podaria and ribs are poorly developed or lacking and there are also differences in pollen structure. We believe that these two populations should be recognized as distinct species, L. williamsii and L. diffusa, respectively. We further believe that the latter represents the ancestral type.
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