Chemical constituents from roots of Euphorbia songarica FTIR Spectra and Their Taxonomic Significance of Nine Euphorbia Species in Shaanxi Chemical constituents from roots of Euphorbia yinshanica Chemical constituents from Euphorbia stracheyi ITS sequence analysis on medicinal plants of Euphorbia L. in Anhui and Jiangsu Provinces Diterpenoids from Euphorbia wallichii Chemical constituents from Euphorbia tirucalli Chemical constituents from roots of Euphorbia yinshanica Survey of resource of medicinal plant of Euphorbia L. in Gansu Province, China Chemical constituents from Euphorbia stracheyi Chemical constituents from Euphorbia tirucalli