Dillenia triquetra (Rottb.) Gilg
The revision of Dillenia (Dilleniaceae) by Hoogland (1952) recognizes a basic division within the genus on the basis of the presence/absence of an amplexicaul petiolar wing. Both D. triquetra, present in Madagascar and Sri Lanka, and D. ferruginea, endemic to the Seychelles, possess the winged petiole. Shared distribution of D. triquetra between Madagascar and Sri Lanka implies a more recent dispersal.
Yellow distribution: Dillenia spp. with amplexicaul winged petiole. Pink distribution: Dillenia spp. without amplexicaul winged petiole.