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A Phylogenetic Study of Tribe Euphorbieae (Euphorbiaceae)1

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A Phylogenetic Study of Tribe Euphorbieae (Euphorbiaceae)1 Reprinted with permission from: International Journal of Plant Science 161(3):425-434. 2000. Published and copyrighted by: © 2000 by The University of Chicago. All rights reserved. A phylogenetic study of tribe euphorbieae 1 (Euphorbiaceae) KI-RYONG PARK2 and WAYNE J. ELISENS Department of Biology, Kyung-Nam University, Masan 631-701, Korea, and Department of Botany and Microbiology, University of Oklahoma, Norman, Oklahoma 73019, U.S.A. Abstract: A phylogenetic investigation of a monophyletic lineage of spurge plants, tribe Euphorbieae, was conducted to elucidate evolutionary relationships, to clarify biogeographic patterns, and to reexamine the previous classifica- tion of Euphorbieae. Cladistic analyses of the 52 morphological characters of 61 species resulted in 2922 equally most parsimonious trees of 193 steps with a consistency index of 0.34. The strict consensus tree indicates genus Anthostema of subtribe Anthosteminae as a likely sister group to all other members of tribe Euphorbieae. The morphological data support a monophyletic origin of subtribe Euphorbiinae, but the subtribes An- thosteminae and Neoquillauminiinae did not form monophyletic groups. Although the previous taxonomic treatments within tribe Euphorbieae have supported the generic status of Pedilanthus, Monadenium, Sy- nadenium, Chamaesyce , and Elaeophorbia, the results of this analysis do not support generic placement of them based on cladistic principles. Rec- ognition of these groups as genera results in Euphorbia becoming a para- phyletic group. One solution to this problem in Euphorbieae is to divide the largest genus Euphorbia into several monophyletic genera and to keep the generic ranks for previously recognized genera. The distribution of basal endemic genera in Euphorbieae showed African and east Gond- wanan affinities and strongly indicated that the ancestor of Euphorbieae originated prior to the breakup of Gondwanaland from an old group in Eu- phorbiaceae. However, some recent African taxa of Euphorbia should be interpreted by transoceanic dispersal from the New World ancestors. Keywords: Phylogeny, Euphorbieae, morphology. 1 Manuscript received March 1999; revised manuscript received October 1999. 2 Author for correspondence; e-mail [email protected] Page 1 of 15 .
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