A new species of Alphonsea (Annonaceae)
Keywords:limestone, South-East Asia, taxonomy
Alphonsea isthmicola I.M.Turner & Utteridge is described. It is a species of tree currently known from two limestone outcrops in Peninsular Thailand and one limestone hill near the Thai border in Peninsular Malaysia. A key to the Alphonsea species of Peninsular Malaysia and Southern Thailand is included.