"Kangare-i" (Scirpus triangulatus) belongs to Cyperaceae (the Sedge family). It is a perennial herb that ia native all over Japan, as well as the Korean Peninsula, China, Indonesia and India. This herb grows in bogs and marshes, and can reach up to 1 m in height. The stems are triquetrous and borne radially on the aquatic rootstocks. The spikelets are pale green to pale brown, oblong, and 4-10 spikelets are borne sideways from August to October. The dead stems remain through winter.