Systematics Section / ASPT
Havery, Shawn , Mast, Austin .
Integrating phylogeny, biogeography, and fossil dates in Banksia and Dryandra (Proteaceae).
The Australian genera Banksia and Dryandra (together ca. 172 spp.) are tremendously diverse. The species range from prostrate desert mats with tough, serrate, long-lived leaves to tall (>20 m) rainforest trees with soft, entire, short-lived leaves. Banksia reaches its greatest diversity in the heathlands of SW Australia, and Dryandra is completely restricted to that isolated corner of the continent. Morphological and molecular (cpDNA, nrITS, and waxy) data support the paraphyly of Banksia with respect to a monophyletic Dryandra. We use four cpDNA regions (trnL intron, trnL/F spacer, rpl16 intron, and matK gene) to reconstruct the phylogeny of the group, and we use multiple calibration points from the group's rich fossil record to date nodes. We will examine the timing of vicariance events between the SW and E coasts of Australia, the origin of the xeromorphic traits (including crypts for leaf stomata and the inrolling of margins of narrow, linear leaves), and the origin of Dryandra.
1 - Florida State University, Dept. of Biological Science, Tallahassee, Florida, 32306, United States
Presentation Type: Poster
Location: Special Event Center (Cliff Lodge)
Date: Tuesday, August 3rd, 2004
Time: 12:30 PM