Phyllagathis siamensis Cellinese & S. S. Renner, nom. nov.
Basionym: Tylanthera cordata Hansen, Nordic J. Bot. 9: 634. 1990.
TYPE: Thailand. Central: Sarika Falls at Nakhon Nayok, 300 m alt., 1968, Larsen et al. 3402 (holotype, AAU; isotypes, BK1R, C). The new name is necessary because the epithet is occupied by Phyllagathis cordata Ridley. Figure 2.
While revising the Melastomataceae for the Flora of Thailand, we discovered two new species of Sonerila, as well as the need for transferring two species of Tylanthera endemic to Thailand into Phyllagathis. Sonerila urceolata and S. loeiensis are endemic to the southeast and the northeast of Thailand, respectively. The first is allied to the widespread S. erecta Jack, from which it differs mainly in the strongly urceolate capsule and the sessile fruit placenta; the second is distinguished from other acaulescent species of Sonerila by its extremely longetiolate large leaves and long-pedunculate inflorescence. The new combinations, Phyllagathis tuberosa (Hansen) Cellinese & Renner and P. siamensis Cellinese & Renner nom. nov., are made because both taxa lie inside the morphologic and phylogenetic bounds of Phyllagathis
Cellinese, N. and Renner, S. S. 1997. New Species and New Combinations in Sonerila and Phyllagathis (Melastomataceae) from Thailand