Betula austrosinensis

Betula austrosinensis is a species of birch that is endemic to China where it is found on elevation of 700 - 1900 m. It occurs in the broaded-leaved forests of southern China.

Description
The tree is 25 m high and is either brown or grayish-brown coloured. Branches are yellowish-brown in colour with elliptic, lanceolate, and oblong leaf blades which are 5 - 14 cm long by 2 - 7 cm wide. It petiole is 1 - 2 cm long while the apex is acuminate. Females have one inflorescence which is erect and oblong, sometimes cylindrical, and is 2.5 - 6 cm by 1.2 - 2.5 cm. It peduncle is 2 - 3 mm long with the bracts length being 0.8 - 1.3 cm. The nutlet itself is elliptic and is 4 - 5 mm long and 2 mm wide. It also have membranous wings and it blooms from June to August while the flowers come out from May to June.