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Abstract Detail



Systematics Section/ASPT

Floden, Aaron J [1].

A phylogeny of Polygonatum and its sister genera.

The Polygonatae (Asparagaceae) comprise three genera with an approximate total of 70 species. Polygonatum is circumboreal with ca. 57 species with its greatest diversity represented in southwest China. The remaining species are split between Disporopsis and Heteropolygonatum, both of which are Asian, but the latter endemic to China. Disporopsis differs from the others in that the filaments are dilated to form a corona and it has a base chromosome number of n = 20. Generic delimitation of Heteropolygonatum and Polygonatum has been based on terminal vs. axillary flowers, dimorphic filament insertion, and imbricate tepals. Observations of living and herbarium material show that only the imbricate tepals are unique to Heteropolygonatum. In addition to morphology a base chromosome number of n = 16 is unique to Heteropolygonatum whereas Polygonatum varies from n = 9-15. Species delimitation in Polygonatum is facilitated by filament shape, which is correlated to phyllotaxy and cytology. To assess the taxonomic issues within and between the genera of the Polygonatae phylogenetic analyses in combination with cytological and morphological examination attempt to resolve taxonomic problems and reconstruct biogeographic history.

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1 - University of Tennessee, Ecology and Evolutionary Biology, 569 Dabney Hall, Knoxville, TN, 37996, USA

Keywords:
Polygonatae
China
endemic species
phylogeny.

Presentation Type: Oral Paper:Papers for Sections
Session: 48
Location: Elmwood/Riverside Hilton
Date: Wednesday, July 31st, 2013
Time: 2:15 PM
Number: 48004
Abstract ID:841
Candidate for Awards:None


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