Gluta orgyalis Blanco [Invalid] Kaluhaburunghos blancoi (Rolfe) Kuntze Kaluhaburunghos heterophyllus (Hook.f.)

[5] It is found in dense deciduous or evergreen forests, from sea level to approximately 700 m (2,300 ft) in Brunei, Cambodia, southern China, Indonesia, Malaysia, Philippines, Singapore, Thailand, and Vietnam.

In Chinese, it is called 闭花木 bi hua mu[6] and in Vietnamese Cách hoa (Sumatra).

Cleistanthus sumatranus is an evergreen tree, growing up to 18 m (59 ft) tall.

Flowers are small, each with five sepals and five small petals (both male and female), with up to seven occurring in axillary fascicles, subtended by normal or smaller leaves, or on leafless spike-like axes.