Perennial herbs (grow for several years from their same root system) found in wet areas including streamside, roadside and forest edges in mountains. Have a soft impression without hair. After flowering, bloom two opposite elongated green fruits. This look like the tails of mackerel and many grow in Kanto region, hence the Japanese name Tougoku-sabanoo literally meaning tail of mackerel in the east. Flowers are 6 to 8 mm in diameters and light cream color. Have yellow petals like sumo referee’s fan inside of sepals looks like flower petals. Leaves are light green and radical leaves (leaves grow from the roots) near the root. Stems have three to five leaves alternate. The shape of leaves is like fans with toothed margins (edges of leaves are like a teeth of saw). Bloom cleistogamous flowers (never open and self-pollinating) at the base of a stem in summer.

●Season Early April to Early May
●Height about 10 to 15 cm
●Place Ura-Takao, Minami-Takao