is a dioecious perennial herb of 0.3-1m in height, commonly seen in
grasslands, paths between paddies, or roadsides. Leaves are
approximately 10cm in length, in a long-oblong-like lanceolate
shape, with the bases generally sagittate; the grounds of the upper
parts embrace stems. Stem's tips emerge racemes conically and set
many small, about 3mm across flowers in them. The female flower's
inner perianth lobes become significant in a wing way, embracing
achenes. Bloom time: May-August.