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Abstract Detail


Tiley, Helene [1], Wight, Spencer [1], Charboneau, Joseph [2], Douglas, Norman [3], Flores Olvera, Hilda [4], Ochoterena, Helga [4], Moore, Michael [1].

Toward a complete species-level phylogeny of the Tribe Helenieae (Asteraceae).

The tribe Helenieae (Asteraceae) evolved in southwestern North America and is comprised of 13 genera (Amblyolepis, Baileya, Balduina, Gaillardia, Helenium, Hymenoxys, Marshallia, Pelucha, Plateilema, Psathyrotes, Psilostrope, Tetraneuris, and Trichoptilium) and 116 species. The taxonomy and generic-level phylogeny of these groups is well-understood thanks to extensive work by Bierner, Baldwin, Wessa, and colleagues. Although the diversity of Helenieae is highest in arid and semiarid ecosystems of western North America, notable exceptions exist: Balduina is endemic to the southeastern United States, most species of Helenium have a strong affinity for wet soils, and both Hymenoxys and Helenium have colonized South America, likely via long-distance dispersal. Moreover, species of Helenieae are commonly encountered on gypsum soils in southwestern North America (including 8 gypsum endemic taxa in Gaillardia), suggesting an ancestral tolerance of the substrate in the tribe. To reconstruct niche evolution and biogeographic history in Helenieae, we are endeavoring to estimate the first complete phylogeny of the tribe at the species and infraspecific levels, using two chloroplast spacer regions (ndhF/rpl32 and rpl32/trnL) as well as nuclear ITS.

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Related Links:
The Origin and Evolution of Gypsum Endemic Plants

1 - Oberlin College, Department of Biology, 119 Woodland St., Oberlin, OH, 44074, USA
2 - University of Arizona, Department of Ecology and Evolutionary Biology, P.O. Box 210088, Tucson, AZ, 85721, USA
3 - University of Florida, Department of Biology, 618A Carr Hall, Gainesville, FL, 32611, USA
4 - Instituto De Biologia, UNAM, Depto Botánica, Apdo.Postal 70-367, Mexico, DF, 04510, Mexico

niche evolution.

Presentation Type: Oral Paper
Session: 46, Asterids I part C & Asterids II
Location: 103/Savannah International Trade and Convention Center
Date: Wednesday, August 3rd, 2016
Time: 4:00 PM
Number: 46009
Abstract ID:305
Candidate for Awards:None

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