Jarandersonia Pereirae (Malvaceae, Brownlowioideae), A New Species From Sabah, Borneo

A new tree species Jarandersonia pereirae S.K. Ganesan & R.C.K. Chung (Malvaceae, Brownlowioideae) is described from Sabah, Borneo, Malaysia. It appears to be a hyperendemic and ultramafic obligate restricted to Gunung Tinkar Forest Reserve, Sabah. It is morphologically most similar to J. rinoreoides, the only other Jarandersonia species found in Sabah. Notes on the distribution and habitat, a conservation assessment, and a key to Jarandersonia species in Borneo are provided.