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Abstract Detail


Systematics Section/ASPT

Ranarivelo, Heritiana [1].

Morphometric relationships, Phylogenetic correlation, and Character Evolution in the Afro-Malagasy Genus Psorospermum (Hypericaceae).

Psorospermum (Hypericaceae) is a poorly known Afro-Malagasy genus. Morphologically, Psorospermum is similar to the Afro-American genus Vismia and the Malagasy genus Harungana; however the circumscription of Psorospermum remains ambiguous. The objectives of this study are: (1) to provide the first comprehensive phylogeny for Psorospermum (Hypericaceae), (2) to delimit species of Psorospermum,(3) to study character evolution including chromosome numbers. Six Malagasy Psorospermum species were used in the only molecular study to include Psorospermum.They form a clade sister to the African Vismia guineensis; all the American Vismia form a separate clade sister to a small clade consisting of the Malagasy genus Harungana madagascariensis plus the African Vismia rubescens. Morphometrics of several vegetative and reproductive characters were used to identity grouping patterns. Preliminary results of Principal Component Analysis show groupings that will be further tested with the new comprehensive phylogeny of Psorospermum. Preliminary discussions regarding character evolution identified within Vismieae are provided. New world Vismia and Malagasy Harungana madagascariensis present the same number of chromosomes n=10. This study contributes directly and significantly to the elaboration of a new classification of the Clusioids and provides useful documentation and information to improve the knowledge of Malagasy plant species.

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1 - University of Missouri St. Louis, Biology, One University Boulevard , St. Louis, MO, 63121, USA

Keywords:
Hypericaceae
Vismieae
Psorospermum
Harungana
Vismia
Madagascar
morphometrics
phylogeny
Chromosomes.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Battelle South/Convention Center
Date: Monday, July 9th, 2012
Time: 5:30 PM
Number: PSY014
Abstract ID:574


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