Castanopsis endertii is a species of plant locally known as Berangan in Malay. It is also called as Kogopon in Dusun ethnic. This species of tree can grow up to 35 m tall and the bole can be around 60 cm diameter. The bark is smooth with ring-like markings and slightly fissured in brownish colour while its inner bark is granular and in greyish colour. The tree has yellowish sapwood and smooth twigs. The elliptic to oblong leaves are thin-coriaceous (having the texture of leather) and glabrous (smooth) on both surfaces. The male flowers are grouped in three-flower clusters along the rachis, whereas the female flowers are distributed singly. Both male and female flowers have acute perianth lobes. There is only one globose (spherical) and thin-walled seed in each subsessile cupule. The seeds are also edible (Soepadmo & Saw, 2000).

Castanopsis endertii is widely distributed throughout Sabah. It is endemic to Borneo but so far not known in Brunei and Sarawak. Other than that, it can be found in the primary and disturbed montane forests at elevations up to 2500 m (Soepadmo & Saw, 2000).