Piper hancei Maxim. is a climbing vine in the Piperaceae family, with a length of several to over 10 meters. It is hairless except for the inflorescence axis and bract stalk; Leaves are paper or nearly leathery, with a short pointed or gradually pointed tip at the top, a gradually narrowed or wedge-shaped base, and usually obvious reticular veins; The leaf sheath is about half the length of the petiole. Flowers are unisexual, dioecious, and clustered into spike like inflorescences opposite to leaves. The total stem is equal or slightly longer than the petiole, the bracts are nearly circular, and the filaments are short. The ovary is nearly spherical, the berry is spherical, yellow, and blooms from March to August. Shanjiao is mainly used as medicine, with the effects of promoting qi circulation, relieving pain, dispelling wind and reducing swelling, and can treat rheumatoid arthritis.

Tiger ear grass belongs to the family of tiger ear grass and is a perennial herbaceous plant with long glandular hairs on its stem; The basal leaves have long petioles, and the leaves have heart-shaped, kidney shaped, and oblate shapes; The stem and leaves are lanceolate in shape, with cone-shaped inflorescence, and the flowering and fruiting period is from April to November. Named after its large leaves resembling tiger ears, it was first recorded in a local herbal book during the Southern Song Dynasty called "Lu Yan Ben Cao". Tiger ear grass is distributed in provinces such as Anhui, Fujian, Guangdong, Guangxi, Guizhou, and southeastern Gansu in China, as well as in North Korea and Japan; It mainly grows under forests, shrubs, meadows, and damp rock crevices at an altitude of 400-4500 meters.