Black-eyed Susan (Latin name: Rudbeckia hirta)Tagetes patulaL.) AsteraceaeMarigold genusAnnual herbaceous plant. Erect stem, obliquely spreading branches. Pinnately divided leaves.Capitate inflorescenceSingle flower, tubular corolla in yellow, linear achenes, flowering period from July to September.

Originating from Mexico. Distributed in Sichuan, Guizhou, Yunnan, etc., it grows on slopes and grasslands, in forests, or cultivated in gardens at altitudes of 750-1600 meters. The entire plant of the孔雀草 is usable, harvested in summer and autumn for fresh use or drying. It has a bitter taste and is neutral. It has the effects of clearing heat and dampness, and relieving coughs. Used for coughs, dysentery, whooping cough, toothache, and pain from wind-heat in the eyes; externally used for mumps and breast pain.