Phillipson, P.B. & M.W. Callmander (2016). Two varieties of Clerodendrum L. (Lamiaceae) from Madagascar raised to specific rank. Candollea 71: 373–377. In English, English and French abstracts.
The authors raise two varieties of Clerodendrum aucubifolium Baker to species rank, providing the new combination Clerodendrum giganteum (Moldenke) Phillipson & Callm. for one, and the replacement name Clerodendrum thouarsii Phillipson & Callm. for the other. The two species differ from typical Clerodendrum aucubifolium and other related species by their distinctive inflorescence structure and floral morphology, and from each other primarily by differences in leaf and bract shape and size.