Revision of the Neotropical genera Bocageopsis, Onychopetalum, and Unonopsis (Annonaceae)
Blumea: Biodiversity, Evolution and Biogeography of Plants , Volume 52 - Issue 3 p. 413- 554
(Annonaceae). The closeness of these three genera was expressed by Fries when he placed them in his (informal) Unonopsis group (Fries, 1959), and the close relationship is supported by more recent phylogenetic research as well. Four species are recognized in Bocageopsis and two species in Onychopetalum. Unonopsis is by far the largest of the three genera with close to 50 species, of which no less than 23 species are here described as new. One species (Unonopsis umbilicata) had to be shelved as insufficiently known for lack of data, and another, obviously new, species from Colombia is too incomplete and is described provisionally as Unonopsis spec. A. Several keys are provided, one for the genera and one each for the species of Bocageopsis and Onychopetalum. For the species of Unonopsis a key to all species and, in addition, a key to the species of Mexico and Central America are provided. The species treatments include full descriptions, geographical and ecological notes, distribution maps, synonymy, taxonomic notes, and vernacular names. A complete list of exsiccatae is appended. Parallel to the taxonomic revision, a leaf anatomical survey was made by E.-J. van Marle, and is included here.
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Maas, P.J.M, Westra, L.Y.Th, & Vermeer, M. (2007). Revision of the Neotropical genera Bocageopsis, Onychopetalum, and Unonopsis (Annonaceae). Blumea: Biodiversity, Evolution and Biogeography of Plants, 52(3), 413–554.