Cleistanthus sumatranus
Cleistanthus sumatranus is an accepted name of a tree species in the genus Cleistanthus (family Phyllanthaceae). No subspecies are listed in the Catalogue of Life.

It is found in dense deciduous or evergreen forests, from sea level to approximately  in Brunei, Cambodia, southern China, Indonesia, Malaysia, Philippines, Singapore, Thailand, and Vietnam. In Chinese, it is called 闭花木 bi hua mu and in Vietnamese Cách hoa (Sumatra).

Description 
Cleistanthus sumatranus is an evergreen tree, growing up to  tall.

The leaves have  petioles with elliptical leaf blades which are typically  by . 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.  Flowering is typically from March–August; fruiting from April–October. The capsules are red and ovoid, approximately , containing seeds which are usually single and up to  in diameter.

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sumatranus
Flora of Indo-China
Trees of Vietnam
Flora of Malesia
Flora of the Northern Indochina subtropical forests