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Venter, H. J. T. & Verhoeven, R. L.: A tribal classification of the Periplocoideae (Apocynaceae). - Taxon 46: 705-720. 1997. - ISSN 0040-0262.
The diagnostic features used to delimit genera are enumerated and critically analysed. Floral characteristics are important: shape and depth of the corolla tube, and positions of outer corona, stamens, and gynostegium. Coronal structure is valuable but can be misleading. Vegetative features are sometimes consistent within genera and may serve as a complement to floral characteristics. The Periplocoideae are, for the first time, subdivided: three tribes are recognized, two of them newly described and named, and the individual genera and generic synonyms are mentioned for each. Some nomenclatural new combinations, required as a consequence of newly proposed synonyms, are validated in the genera Camptocarpus (4), Cryptolepis (4), Decalepis (2), and Pentopetia (2).
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Effective publication date: 13 November 1997