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Chromosome Numbers in Sphaeralcea Section Fendlerianae
John C. La Duke
American Journal of Botany
Vol. 73, No. 10 (Oct., 1986), pp. 1400-1404
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2443844
Page Count: 5
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Chromosome numbers are reported for ten taxa in Sphaeralcea section Fendlerianae (Malvaceae). New ploidy levels are reported for six taxa, with one species not previously reported, and extensive polyploidy at all taxonomic levels is documented. The geographic and taxonomic distribution of polyploids suggests that polyploidy arose many times in the taxa of Sphaeralcea. Sphaeralcea fendleri var. venusta, S. polychroma, and S. wrightii populations have yielded exclusively tetraploid counts. Tetraploidy is correlated with taxa having lavender petals. Polyploidy has also allowed the taxa to expand their distributions without resulting in speciation.
American Journal of Botany © 1986 Botanical Society of America, Inc.