The "Sentou-so" (Chamaele decumbens) belongs to Apiaceae (the Carrot family). It is a perennial herb that is native to Japan. This herb grows in wettish places of mountains or fields and can reach 10-30 cm in height. The leaves are basal and trifoliate to triternate compound with purple tinged long petioles. The compound umbels are borne on the flowering stalks and bloom small white flowers from March to May. The origin of its Japanese name "Sentou-so" is unknown. It is also known as "Ouren-dameshi", because its leaves resemble those of "Seriba-ouren". It is said to be delicious when eaten.