Betula austrosinensis is a species of birch that is endemic to China where it is found on elevation of 700-. It occurs in the broaded-leaved forests of southern China.[1]
The tree is 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- long by 2- wide. It petiole is 1- long while the apex is acuminate. Females have one inflorescence which is erect and oblong, sometimes cylindrical, and is 2.5- by 1.2-. It peduncle is 2- long with the bracts length being 0.8-. The nutlet itself is elliptic and is 4- long and wide. It also have membranous wings and it blooms from June to August while the flowers come out from May to June.[1]