Plastid and Seed Morphology Data Support a Revised Infrageneric Classification and an African Origin of the Pantropical Genus Xylopia (Annonaceae)

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Stull, Gregory | Johnson, David | Murray, Nancy | Couvreur, Thomas L.P. | Reeger, Jenna | Roy, Caroline

Edité par CCSD ; Aspt American Society of Plant Taxonomists -

International audience. The floristic treatment of Engler and Diels, published in 1901, provides the only infrageneric classification of the pantropical genusXylopia (Annonaceae). Here we test and extend that classification using molecular and seed morphology characters. Phylogenetic relationships werereconstructed using data from four plastid regions obtained from 44 of the approximately 165 species in the genus, recovering four well-supportedmajor clades. Seed characters were examined for these taxa, and six aril morphologies, three previously undocumented, were distinguished; we alsodocument the presence of a sarcotesta on the seeds of many species. Molecular and seed data support recognition of five sections within the genus;one, Xylopia sect. Rugosperma, is proposed here as new. Our phylogenetic results suggest an African origin for the genus and reveal complexbiogeographic patterns, likely facilitated by long-distance dispersal

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