The secretory canals were distributed in the pericycle and secondary phloem of root, in the phloem and pith of stem, and in the phloem and above xylem of the vein in leaf.

• 研究结果表明，分泌道分布在根中柱鞘组织和次生韧皮部、茎韧皮部和髓，以及叶脉韧皮部内和木质部上方。