Ophiopogon japonicus is a species of Ophiopogon native to Japan. Forests, dense scrub in ravines, moist and shady places on slopes and along streams, cliffs; 200--2800 m. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hebei, Henan, Hubei, Hunan, Jiangsu, Jiangxi, Shaanxi, Shandong, Sichuan, Taiwan, Yunnan, Zhejiang [Japan, Korea]. It is an evergreen, sod-forming perennial plant. The leaves are linear, 40 cm long. The flowers are white to pale lilac, borne in a short raceme on a 5–10 cm stem. The fruit is a blue berry 5 mm diameter. It is also grown as an ornamental plant, providing an excellent groundcover. In Chinese medicine Ophiopogon japonicus tuber, known as mai men dong, is the cardinal herb for yin deficiency. According to the Chinese Herbal Medicine Materia Medica, the herb is sweet, slightly bitter and slightly cold, enters the heart, lung and stomach channels and nourishes the yin of the stomach, spleen, heart and lungs and clears heat and quiets irritability.