Japan Flora: Dioecious per­ennial herb, acid to taste, from dender creeping branched rhi­zomes, glabrous or with scattered hairlike papillae; stems slen­der, erect, few-leaved, sometimes branching; radical leaves long-petioled, hastate, 3-6 cm. long, 1-2 cm. wide, acute to obtuse, the cauline rather small, the sheaths scarious; in­florescence paniculate, the flowers small, about 2 mm. long, the sepals unchanged in fruit, not warty; achenes broadly elliptic, trigonous, brown, slightly lustrous, about 1.2 mm. long, the angles rather obtuse.  May-July. Waste grounds and meadows in lowlands and foothills;

Hokkaido, Honshu, Shi­koku, Kyushu; naturalized and very common locally.  Europe and w. Asia.