title: Pharmacognostical studies of Ephedra plants Part I - The comparative histological studies on Ephedra rhizomes from Pakistan and Afghanistan and Chinese crude drugs "Ma-Hung-Gen".
mesh_terms: D000346:Afghanistan; D002681:China; D010154:Pakistan; D010598:Pharmacognosy; D010946:Plants, Medicinal / Q000033:anatomy & histology*; D013045:Species Specificity