arisaema ringens

Knema lenta is a small tree species in the genus Knema, of the family Myristicaceae. It may be a synonym of Knema glauca (Bl.) Warb. and is called: 狭叶红光树 xia ye hong guang shu in Chinese and máu chó thấu kính in Vietnamese.

The tree grows up to 20 m (66 ft) tall, in tropical forest areas up to 1,200 m (3,900 ft) in elevation, in Bangladesh, China (Yunnan), India (including Andaman Islands), Myanmar, Thailand and Vietnam.