The Weeping lovegrass (Eragrostis curvula) belongs to Poaceae (the Grass family). It is a perennial herb that is native to southern Africa. Nowadays, it is naturalized worldwidely, from Africa to southern Europe, Asia, Oceania and North America. This grass was introduced into Japan for erosion and torrent control in early Showa Era (about 70 years ago). The stems are erect and crowded and can reach 60-120 cm in height. The leaves are linear 1.5-2 mm wide, glabrous and weeping. It is borne panicels in summer, the spikelets come on branchlets arranging wholed and open.