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PRELIMINARY CLASSIFICATORY STUDIES IN COCCOTHRINAX (PALMAE: CORYPHOIDEAE)
Clifton E. Nauman and Roger W. Sanders
Vol. 12 (1991), pp. 91-101
Published by: Marie Selby Botanical Gardens Inc.
Stable URL: http://www.jstor.org/stable/41759777
Page Count: 11
You can always find the topics here!Topics: Taxa, We they distinction, Leaf sheaths, Cladistics, Inflorescences, Biological taxonomies, Bracts, Literature, Plants, Herbaria
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Published infrageneric classifications of Coccothrinax are based only on Cuban species. To provide an inclusive categorization of provisional infrageneric groupings for easy recognition in future field and herbarium studies, we compared all species in the genus with statistical, phenetic, and cladistic techniques. Statistical analyses indicated that 22 of 160 characters extracted from the published literature would be useful for phenetic and cladistic analyses. Phenetic analyses produced three distinct clusters of taxa. Cladistic analyses suggested that two of the phenetic clusters are paraphyletic and the third is monophyletic. The two paraphyletic clusters were also more plesiomorphic than the monophyletic cluster. Cladistic analyses further indicated that most of the 22 characters were highly homoplasious, and only the following were reliable for classificatory purposes at the infrageneric level: loss of transverse veins in the leaf, elongation of the leaf sheath strands, fusion of sheath strands into spine-like processes, and tan, corky fruits. The recognizable groups are as follows: Argentea Group (1 complex, 6 spp., paraphyletic); Argentata Group (2 complexes, 10 spp., probably paraphyletic)—C. argentata complex (8 spp., paraphyletic), C. crinita complex (2 spp., monophyletic); and Pauciramosa Group (4 complexes, 31 spp., probably monophyletic)—C. miraguama complex (11 spp., probably monophyletic), C. pauciramosa complex (11 spp., paraphyletic), Haitiella complex (2 spp., monophyletic), species incertae sedis (7 spp.).
Selbyana © 1991 Marie Selby Botanical Gardens Inc.