雄蕊2，花冠筒的着生的在基部，几乎不外露。
Stamens 2, inserted at base of corolla tube, scarcely exserted.
叶密被长硬毛背面的特别是在脉上。花对生。显著被微柔毛有环的花冠筒在里面。
Leaves densely hirsute especially on veins of abaxial surface. Flowers opposite. Corolla tube conspicuously puberulent annulate inside.
结果显示：绿原酸主要分布于萼筒和花冠筒的内、外表皮细胞及外表皮下的几层细胞中；
The results showed that chlorogenic acid mainly distributed in the epidermis cells and the next layers cells of outer epidermis in calyx tube and corolla tube;
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