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A Systematic Revision of "Breonia" (Rubiaceae-Naucleeae)

Sylvain G. Razafimandimbison
Annals of the Missouri Botanical Garden
Vol. 89, No. 1 (Winter, 2002), pp. 1-37
DOI: 10.2307/3298655
Stable URL: http://www.jstor.org/stable/3298655
Page Count: 37
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A Systematic Revision of "Breonia" (Rubiaceae-Naucleeae)
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Abstract

Breonia A. Rich., a Malagasy endemic genus of the tribe Naucleeae (Rubiaceae, Cinchonoideae), is revised here. The morphology of Breonia species is described and compared with that of the other Malagasy Naucleeae, Breonadia Ridsdale, Gyrostipula J.-F. Leroy, and Janotia J.-F. Leroy. Breonia is distinguished from these genera by having flattened and elongated placentae, imbricate ovules, and indehiscent, multiple fruits rather than triangular placentae, ovules attached side by side to the base of the placentae, and free, capsular fruits as in these genera. Neobreonia Ridsdale is again included in Breonia. Twenty species are recognized, including eight that are new to science. A full taxonomic treatment, keys, and distribution maps of the recognized species are provided. The newly described species are illustrated.

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