Abstract
Callmander, M. W., P. B. Phillipson & G. E. Schatz (2014). Towards a revision of the genus Vitex L. (Lamiaceae) in Madagascar I : a distinctive new species from North-eastern Madagascar. Candollea 69: 141–147. In English, English and French abstracts. A review of the genus Vitex L. (Lamiaceae) in the context of the “Catalogue of the Vascular Plants of Madagascar” project has led us to discover a number of probable new species and uncover other necessary taxonomic changes for the genus. One particularly distinctive new species, Vitex lowryi Callm., Phillipson & G. E. Schatz, is described and illustrated in this article, the first of a series in which we envisage presenting the results of our ongoing investigations on Malagasy Vitex. A discussion of the differences between the new species and a group of the morphologically most similar species of the genus in Madagascar is provided, together with photographs showing the key features of each. Finally, a distribution map and a preliminary conservation assessment following IUCN Red List Categories and Criteria are provided for the new species.
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