The Japanese pearlwort (Sagina japonica) belongs to Caryophyllaceae (the Carnation family). It is an annual herb that is native all over Japan, as well as the Korean Peninsula, China and around the Himalayas. This herb grows in fields, roadsides or waste grounds, and can reach about 15 cm in height. The stems are much branched at the bases and bear linear leaves oppositely. The Japanese name is derived from the bird's claw-like leaf. The long peduncles are borne on the axils and the white small flowers bloom from March to July.