Pteroxygonum

Pteroxygonum is a plant genus in the family Polygonaceae. , two species are recognized. Their native range is from Tibet to southeast China.

==Description== Species of Pteroxygonum are twining vines growing from a large woody globe-shaped tuber. Their leaves are broad and palmate, with a dark red mark around each primary leaf vein. The inflorescence is in the form of an axillary raceme. The flowers are bisexual, with five spirally arranged tepals, eight stamens joined at the base, and three styles, also joined up to about the middle. Nectar is produced from tissue at the base of the stamens. Their fruits are in the form of winged, three-angled achenes.