Systematics Section / ASPT
Harbaugh, Danica T. , Baldwin, Bruce G. .
Biogeography and phylogeny of the sandalwood genus Santalum (Santalaceae) based on ITS sequence data.
Phylogenetic analyses of ITS sequence data from 20 of 29 currently recognized taxa in Santalum provide evidence for broad-scale, historical biogeographic patterns in the genus. A well-supported basal grade of taxa from Australia supports an origin of the genus on that continent. Multiple long-distance dispersal events must be postulated to account for the distribution of Santalum in India and the Pacific. As previously proposed, the Hawaiian species recently treated in sect. Hawaiiensia (S. ellipticum and S. paniculatum) are evidently more closely related to one another than to the other Hawaiian endemics, S. freycinetianum and S. haleakalae, recently treated in sect. Santalum. The earlier hypothesis of two independent colonizations of the Hawaiian Islands by ancestors of the two species groups is currently unresolved; the two lineages including the Hawaiian taxa constitute a clade, although the lineage including S. freycinetianum and S. haleakalae also includes S. boninense from the Bonin Islands and S. insulare from Henderson Island and the Marquesas Islands. Sampling of additional populations, taxa, and genes is being pursued to shed more light on the evolutionary and biogeographic history of sandalwoods.
1 - University of California, Berkeley, Integrative Biology, University and Jepson Herbaria, 1001 Valley Life Sciences Building, Berkeley, California, 94720-2465, USA
Presentation Type: Paper
Location: Cottonwood A (Snowbird Center)
Date: Wednesday, August 4th, 2004
Time: 11:15 AM