Systematics Section / ASPT
Randle, Christopher P. , Mort, Mark E. , Burgoyne, Priscilla M. , Smith, Gideon F. .
Phylogenetic investigation of the genus Crassula L. (Crassulaceae).
The genus Crassula comprises approximately 150 species and numerous subspecific taxa, which are divided into two subgenera and twenty sections. Species in the genus exhibit considerable diversity in a number of characteristics. Species habit ranges from gracile aquatic annuals to arborescent perennials. Flowers vary in morphological characteristics including the length of the floral tube if present, corolla color, the presence and appearance of petal appendages, and the arrangement and development of flowers within an inflorescence. Base chromosome number is seven or eight, but many species are high polyploids and ploidy number varies considerably as well. In this study, chloroplast and nuclear gene sequences from a broad sampling of species were used to infer the phylogeny of the genus. This phylogeny was used to investigate 1) the origins of the aquatic and annual habits within the genus, and 2) the monophyly of sections as delimited by Toelkin.
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1 - University of Kansas, Department of Ecology & Evolutionary Biology, Natural History Museum and Biodiversity Research Center, 1200 Sunnyside Avenue, Lawrence, Kansas, 66045-7534, USA
2 - National Herbarium (Pretoria), Private Bag X101, Pretoria, 0001, Republic of South Africa
Presentation Type: Oral Paper
Date: Monday, August 15th, 2005
Time: 2:30 PM