汝半夏是历史上盛产于汝宁府一带的一种野生中药材。该药材以其个头大、粉质足、色泽白、药效高而享誉中外。不仅畅销我国南北28个省,而且出口日本、朝鲜以及东南亚各国,建国前,曾在国际博览会上展销,成为广受医药界欢迎的中药材特产。但是,在漫长的历史年代,汝半夏是以野生形式生长于荒坡洼地、河沟渠旁,或农田林下,全靠零星采挖来满足市场需求。本世纪七十年代以来,随着荒地的开垦,河流的治理和农田精耕细作的发展,使半夏失去了滋生繁衍的条件而濒于绝迹。许多年来,汝 Half the summer is rich in the history of Runfu Prefecture in a wild Chinese herbal medicine. The medicine with its big head, silty enough, white color, high efficacy and renowned Chinese and foreign. Not only sold in our country 28 provinces, but also exported to Japan, North Korea and Southeast Asian countries, before the founding of the PRC, has been in the International Fair on sale, become widely welcomed by the pharmaceutical industry Chinese herbal medicines specialty. However, in the long historical era, the native form of the Pinellia terrestris grows wildly along the ravine depressions, river ditches, or under farmland and sporadically relies on sporadic digging to meet the market demand. Since the seventies of this century, with the reclamation of wasteland, the management of rivers and the intensive cultivation of farmland, Pinellia lost its breeding and extinction conditions and is on the verge of extinction. For many years, Ru