Revision of the Malesian species of Lobelia section Rhynchopetalum (Campanulaceae: Lobelioideae)

Detailed morphological study of specimens of Lobelia sect. Rhynchopetalum from Malesia revealed that this material could be divided into five species, all endemic to the region: L. philippinensis (three subspecies) and L. proctorii, endemic to the Philippines; L. sulawesiensis, sp. nov., endemic to Sulawesi; L. sumatrana, endemic to Sumatera; and L. eryliae, with one subspecies in the Philippines and the other in Sulawesi. A key is provided for distinguishing these taxa and each is described fully.