Abstract
Abstract Dombeya Cav. (Malvaceae) as presently defined encompasses over 200 species and considerable morphological variation. Within the 2- to 3-carpellate Dombeya subg. Xeropetalum (Delile) K. Schum., almost half of the recognized species belong to Dombeya sect. Decastemon Planch., which is endemic to Madagascar and traditionally distinguished by its umbellate rather than cymose inflorescences. The most recent taxonomic treatment of this section recognized 47 species and numerous infraspecific taxa; an additional species referable to this group was recently described. The present treatment recognizes 41 species and 11 subspecies. Six species (D. micrantha Appleq., D. milleri Appleq. & Bosser, D. pauciflora Appleq., D. pilosissima Appleq. & T. Andriam., D. ratovosonii Appleq. & Bosser, D. vohemarensis Appleq.) are newly described, and one (D. ramiovensis (Arenes) Appleq. [≡ D. farafanganica Arenes subsp. ramiovensis Arenes]) is newly elevated to specific rank. Dombeya parvipetala Arenes, which (like D. pi...
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