The country has a kind of weed, each its leaf is a careful heart, very good-looking, it still has big effect, we come today well understand it. Huang Du, alias yellow medicine (a book on Chinese medicine is primitive) , edible tulip (graph of plant name fact is taken an examination of) , more than 0 child yam (Russia, pull, Chinese spermatophyte name) , more than 0 potato (Guangzhou plant records, Hainan plant records) , huang Yaozi (the name of province medicinal material such as Jiangsu, Anhui, Zhejiang, Yunnan) , edible tulip (Yunnan Hunan is male) . The country has a kind of weed, each its leaf is " careful heart " , very good-looking! Vivacious herbaceous and feral liana. Circle of stem tuber egg or pear form, cortical violet black, densely covered fibril, cauline Zun Xuan, unifoliate each other is unripe, body of wide heart state, base ministry relaxedly form, tip grows end record, xie Quanyuan, unisexual flower, shape of spic of male flower foreword is flagging, armpit of fascicular Yu Xie, flower is small concentrated, shallow green white; Female flower is clingy in axis, the knot in the bine has a certain number of egg circle spherule, be like yam beans. Its effect has cool blood, fall fire, disappear wart, alexipharmic, treat haematemesis, nosebleeding blood, larynx pain or numbness caused by cold, goitre is angry, sore carbuncle scrofula. Nevertheless, this species is the poisonous plant that database of Chinese plant a collection of illustrative plates collects, all had reported its noxiousness in and other places of Zhejiang, Sichuan, Guangxi; Africa also labels poisonous plant, so the netizen cannot try everybody easily.