Amended descriptions and revised sectional assignment of some Asian begonias (Begoniaceae)

In the course of a monographic revision of Begonia sect. Sphenanthera, a nu mber of species were found to exhibit characteristics that place them withi n other sections. These species are here reassigned to their appropriate se ctions. The following three species are transferred to Begonia sect. Peterm annia: B. axillipara Ridl., B. brachyptera Merr: & L. M. Perry, and B. pseu dolateralis Warb. Begonia brachyptera is treated here as a synonym of B. br achybotrys Merr. & L. M. Perry, a species that had previously been assigned to sect. Petermannia. Begonia dux C. B. Clarke, a species tentatively assi gned by its author to Begonia sect. Casparya ( = Sphenanthera), is transfer red to sect. Platycentrum. The species is newly reported from India. Planty centrum teysmannianum Miq. is transferred to Begonia sect. Platycentrum. De scriptions are provided for the poorly known species B. axillipara, B. brac hybotrys, B. dux, and B. teysmanniana; and a diagnosis is provided for the better-known species B. pseudolateralis.