Stamens 2, inserted at base of corollatube, scarcely exserted.
雄蕊2，花冠筒的着生的在基部，几乎不外露。
2
Leaves densely hirsute especially on veins of abaxial surface. Flowers opposite. Corollatube conspicuously puberulent annulate inside.
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。
3
The results showed that chlorogenic acid mainly distributed in the epidermis cells and the next layers cells of outer epidermis in calyx tube and corollatube;