Seven-star sword is one of the nicknames of Shiwei, whose scientific name is Shiwei, which is recorded as Shiwei in the textual research of plant names. Also known as flying sword, seven-star sword, one arrow, centipede seven, lung heart grass, mountain wood knife, centipede on wood, lung muscle grass, ground entertainment, seven-star sword, snake tongue wind, stone strength and so on.

Pyrrosia, a perennial herb of Polypodiaceae, is a kind of plant attached to rocks in the shade, also known as bark, stone and venus grass. The height of the plant is about 30 cm, which is widely distributed in the south of the Yangtze River in China, especially in Yunnan, Guizhou and Guangdong. It is a Chinese herbal medicine with diuretic, stranguria-relieving, lung-clearing and asthma-relieving effects.