What is "megistostigma"

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.

1. Megistostigma burmanicum - Assam, Myanmar, Thailand, Perlis
2. Megistostigma cordatum - Sumatra, Sabah, Samar
3. Megistostigma glabratum - Peninsular Malaysia, Anamba Islands, N Sumatra
4. Megistostigma peltatum - Siberut, Natuna, Java
5. Megistostigma yunnanense - Yunnan