The leaves are opposite, papery, narrowly elliptic, ovate lanceolate or long ovate, about 4-19cm long, about 2-8cm wide, the top is acuminate or acute, the base is wedge-shaped or wide wedge-shaped, usually entire, rarely serrated, the color above is dark green, there are star shaped hairs, the bottom is light green.
The flowers are dense and dense, in cymose panicles, with short pedicels, lanceolate bracteoles, campanulate calyx, purplish violet corolla, white or yellowish white, orange throat, yellow inside, cylindrical corolla tube, oblong anthers and club like stigmas.
