Open field survey,data collection,taxonomic research and specimens identification were employed,to confirm species and geographic distribution of the medical plants of Gentianaceae,Asclepiadaceae,Boraginaceae and Rubiaceae in Guizhou.As a result,29 species(include varieties)of the medical plant of Gentianaceae have been found in Guizhou.58 species(include varieties)of the medical plant of Asclepiadaceae have been found in Guizhou.21 species(include varieties)of the medical plant of Boraginaceae have been fo...