Sterculia monosperma

Sterculia monosperma (Chinese:蘋婆 (Ping Po); Thai:เกาลัดไทย), also known as Chinese chestnut, Thai chestnut and seven sisters' fruit, and phoenix eye fruit, is a deciduous tropical nut-bearing tree of genus Sterculia.

Its origin is Southern China (Guangdong, Guangxi, Yunnan and Taiwan), but it is now a common cultivated tree in Northern Thailand, Northern Vietnam, mountainous areas of Malaysia and Indonesia, as well as Northern Laos and Shan State in Burma.