Abstract:Laticifers of Jatropha curcas L. （Euphorbiaceae） are cells which secret latices with medicinal components. The types, distribution and sizes of laticifers in all organs of this species were observed under light-microscope by the means of paraffin sectioning, freeze-sectioning and semi-thin sectioning. The results showed that there were four types of laticifers in Jatropha curcas, i.e. articulated anastomosing and nonanastomosing laticifers, non-articulated branched and unbranched laticifers. The laticifers were commonly distributed in the cortex and phloem, whereas a few laticifers in xylem of stem and vein, as well as in pith of stem, petiole, pedicel and fruit stalk. The diameters in laticifers near vascular tissues were wider than those near the epidermis. In stem, the diameters of laticifers near vascular tissues and near epidermis were 40-60 μm and 5-18 μm, respectively.