ibclogo XVI International Botanical Congess


Abstract Number: 5839
Session = 12.2.6


A PHYLOGENETIC ANALYSIS OF THE INAPURTURATE POLLEN CLADE IN THE SUBFAMILY CROTONOIDEAE (EUPHORBIACEAE) USING MORPHOLOGY.


B. A. Smith1 and G. L. Webster2 (1Section of Evolution and Ecology and 2Section of Plant Biology, University of California, Davis, CA 95616, USA)


To date, very few phylogenetic analyses have been done on the Euphorbiaceae family or subfamilies therein. We are particularly interested in the placement of Croton within the subfamily Crotonoideae. The subfamily Crotonoideae contains 66 genera and is divided into 12 tribes. Within this subfamily, Croton is part of a large clade with 54 genera, all having inapurturate pollen. The combination of inapurturate pollen with crotonoid sculpturing is extremely rare in angiosperms and thus this inapurturate crotonoid group is thought to be monophyletic. Phylogenetic analyses were performed on this inapurturate clade using morphological and anatomical characters. Results from these analyses and the position of Croton within the inapurturate clade will be discussed.


HTML-Version made 7. July 1999 by Kurt Stüber