"Koke-tanpopo" (Solenogyne mikadoi) belongs to Asteraceae (the Aster family). It is a perennial herb that is distributed in the Nansei Islands of Japan, from Amami Oshima to Tokunoshima, Okinawa Island, and Iriomote Island. It grows on rocks in sunny mountain streams and is 3 to 5 cm tall. The leaves are oblanceolate-cuneate, pinnately lobed or with three lobes at the tip. From July to September, the several white or pale yellow tubular flowers are produced in a head-like inflorescence at the end of the flower stalk. The fruit is a thin, 1.5 mm long, hairless fruit.