In his Fl. Madagasc. treatment Moldenke (1956) enumerated 72 species. However 2 spp (C. kaempferi (Jacq.) Siebold. and C. nutans Wall. ex D. Don) were stated to have probably been reported from Madagascar in error, 5 spp (C. buchanani Roxb. ex Wall. [var. fallax (Lindl.) Baker], C. heterophyllum Poir., C. myricoides (Hochst.) R. Br. ex Vatke, C. speciosissimum Morren, C. thomsonsae Balf.) were believed by Moldenke to have been recorded only from cultivated material, 4 spp were anticipated to likely have been introduced and likely to have become naturalized, but for which no herbarium specimens were known (C. calamitosum, C. inerme (L.) Gaertn., C. serratum (L.) Moon and C. villosum Blume) and one species was stated to have been introduced and possibly naturalized (C. indicum (L.) Kuntze). Therefore only 60 of the 72 enumerated were regarded by Moldenke as native to Madagascar. Other species are found in cultivation as ornamental, we do not believe that C. indicum is naturalized in Madagascar.
Since the Fl. Madagasc. treatment 3 spp of Clerodendrum have been transfered into Rotheca, 2 into Vitex and 1 into Boutonia (Acanthaceae). Following current generic circumscription, several species require transfer to Volkameria, currently only 1 of these has an available name combination in that genus. The genus is currently under revision for Madagascar by P. Phillipson (MO), in collaboration with L. Allorge (P), M. Callmander (G) and J. Wearn (K).