Abstract Detail

Systematics Section / ASPT

Hearn, David [2], McDade, Lucinda A. [1].

The phylogeny of Adenia Forsskal (Passifloraceae), new species, and a new combination.

Adenia Forsskal (Passifloraceae) is an Old World tropical lineage of ca. 100 species that radiated dramatically in habit. Adenia is shown to be monophyletic using a modified parametric bootstrap, and in the context of this lineage, we focus o­n Malagasy species. We describe four new species (one mainland African) and o­ne new combination. Formerly identified as A. digitata, A. kigogoensis sp. nov. from Kigogo Forest, Tanzania, is shown to be distinct from A. digitata and is most closely allied to A. stenodactyla. The remaining species are local endemics of Madagascar. Adenia trichocalyx sp. nov. is the o­nly Malagasy taxon with pubescent calyx and petals; it is known from o­ne locality in Ankarana. Adenia littoralis sp. nov. has also been collected from o­nly o­ne (coastal) locality in northern Madagascar. Its fruit size and leaf form are distinct from allied species. Both A. trichocalyx and A. littoralis have large storage structures: a tuber in A. trichocalyx and a pachycaul stem in A. littoralis. In contrast, A. mcdadiana sp. nov. is a liana with no tuber and little succulence. Compared to its closest putative relative, A. sphaerocarpa, A. macdadiana has reduced laminar glands and neotenic leaves. Lastly, we clarify the position of A. stylosa with respect to A. firingalavensis and A. epigea under which it was formerly included. Plants of Adenia are highly variable, and it is likely that more undescribed species will be recognized as that variability is characterized.

1 - Academy of Natural Sciences, Botany, 1900 Ben Franklin Parkway, Philadelphia, Pennsylvania, 19103, USA
2 - University of Arizona, Department of Ecology and Evolutionary Biology, BSW Room 310, Tucson, Arizona, 85721-0088, USA

Keywords:
adaptive radiation
Adenia
endemism
growth habit
Madagascar
Passifloraceae
parametric bootstrap.

Presentation Type: Paper
Session: 30-6
Location: Cottonwood B (Snowbird Center)
Date: Tuesday, August 3rd, 2004
Time: 9:30 AM
Abstract ID:32