Japan Flora: Small reddish herb about 1 cm. long, deltoid or rounded in outline; stems or main axis closely branched, papillose, densely leafy, few-rooted; leaves sessile, 2-lobed, papillose, especially toward the base, deltoid- orbicular, about 1-1.5 mm. long, very obtuse to rounded at apex, hyaline on margin. Ponds and paddy fields.
Honshu (Kinki Distt. and westw.), Shikoku, Kyushu. China to India.