Megistostigma is a genus of plant of the family Euphorbiaceae first described as a genus in 1887. It is native to southern China, Assam, and Southeast Asia. Species 1. * - Assam, Myanmar, Thailand, Perlis 2. * - Sumatra, Sabah, Samar 3. * - Peninsular Malaysia, Anamba Islands, N Sumatra 4. * - Siberut, Natuna, Java 5. * - Yunnan