A New Species and a New Variety of Bistorta (Polygonaceae) from the Sino-Himalayan Region

摘要

A new species and a new variety of Bistorta (Polygonaceae), B. attenuatifolia and B. sinomontana var. pubifolia, are described from the Sino-Himalayan region. Bistorta attenuatifolia is similar to B. sinomontana (Sam.) Miyam., from which it differs by radical leaves with narrowly cuneate base. Bistorta sinomontana var. pubifolia is characterized by leaves with brown very short soft hairs on lower surface.