Piper longum is the ear of Piper longum of Zanthoxylum family, which lives in the sparse forest at an altitude of 600 meters. Also known as rat tail. It was first published in the pharmaceutical book Kaibao Materia Medica edited by Liu Han and Ma Zhi. The book contains 984 kinds of drugs, among which there are a large number of long pepper. If you are interested, you can also look at the Compendium of Materia Medica, written by medical scientists in the Ming Dynasty, which records many Chinese herbal medicines. I believe it will benefit a lot after reading it.