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Abstract Detail



Systematics Section/ASPT

Lu, Pei-Luen [1], Morden, Clifford [2].

Phylogenetic Relationships among Dracaena, Pleomele, and Sansevieria (Asparagaceae: Nolinoideae).

The global evolutionary pattern among the dracaenoid plant genera Dracaena, Pleomele, and Sansevieria has remained ambiguous. Their classification has been disputed due to different taxonomic interpretation and the difficulty in morphological characterization of the species and genera. This study explores the phylogenetic analysis of 96 species representing all three genera using four combined chloroplast intergenic spacer DNA regions (trnL-trnF, ndhF-rpl32, trnQ-rps16, and rpl32-trnL). The combined dataset was analyzed using parsimony, maximum likelihood, and Bayesian analysis. Results show that 1) the monophyly of dracaenoids is confirmed; 2) the Hawaiian Pleomele species are the sister group to the remainder of the dracaenoid phylogeny; 3) species of Dracaena and the remaining Pleomele are intermixed; 4) Sansevieria is monophyletic, but is nested within Dracaena; 5) the Central American species D. americana and D. cubensis are the basal group to the remainder of the dracaenoid species. The Hawaiian Pleomele are morphologically and genetically distinct from the remaining dracaenoids and are recognized as a distinct genus, Chrysodracon, and new species combinations are made. The paraphyletic relationship of Sansevieria with Dracaena indicates that those species should be combined with and recognized as species of Dracaena. The polyphyletic relation of Pleomele species with Dracaena confirms previous morphological based studies that combined these genera.

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1 - Honolulu Community College, University of Hawaii, Department of Natural Sciences, 874 Dillingham Blvd., Honolulu, HI, 96817, United States
2 - University of Hawaii, Department of Botany, 3190 Maile Way, HONOLULU, HI, 96822-2279, USA

Keywords:
none specified

Presentation Type: Oral Paper:Papers for Sections
Session: 48
Location: Elmwood/Riverside Hilton
Date: Wednesday, July 31st, 2013
Time: 2:30 PM
Number: 48005
Abstract ID:172
Candidate for Awards:None


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