Legend has it that Pennisetum is a gift from Satan, the Lord of hell, and the poisoned person will become a werewolf. There is no such plant in reality, only buttercup. Also known as: Wufeng Chaoyang grass, Sifang Dioscorea bulbifera (Guizhou folk medicine), Phoenix ginseng, Populus euphratica, and Artemisia gentiana (Yunnan Chinese herbal medicine). The source is the whole grass of Pedicularis rex. The king of Scrophulariaceae. Pedicularis, king of plant morphology, perennial herb, height 10 ~ 90cm. Stems angular and striped, hairy or glabrous. Leaves 4, sometimes 3, whorled; The petiole of the upper half is enlarged and combined with each other to form a bucket. Leaves pinnately divided or deeply divided, 3.5 ~12cm long and1~ 4cm wide. Lobes are linear, oblong to rectangular, 4 ~ 8 mm wide and serrated. Racemes; The base of the bract is all expanded and combined into a bucket, and the first half is pinnately divided; Calyx length 10 ~ 12 mm, hairless membrane, degenerated teeth, wide and round; Corolla yellow, 2 ~ 3 cm long, hairy on the back of helmet, with 1 pair of fine teeth at the lower edge of apex; Stamens 2 pairs, hairy. Capsule ovoid, long 10 ~ 15 mm, with short beak at the top. The flowering period is from June to August. The fruiting period is August-September. Born in hillside grassland or sparse forest. Distributed in Yunnan, Guizhou, Sichuan and other places. The root (rejuvenation root) of this plant is also used as medicine, which is detailed in another article. Summer harvest and autumn harvest. The taste of nature is bitter and spicy. Indications: clearing away heat and relieving exterior syndrome. The prescription for treating measles is: Wufeng Zaocao is one yuan and fifty cents, and coriander (white perilla) is fifty cents. Decoct water. Textual research: from Guizhou folk medicine.