The leaves of litchi grass are oval or oval lanceolate, about 2-6cm long and 0.8-2.5cm wide, with blunt or sharp apex, round or wedge-shaped base, small round serrations on the edge of the leaves, golden yellow gland dots on the back and pubescence on the veins. Leaves opposite, easy to fall off or broken, most of the complete leaves shrunk or curled.
The stem of litchi grass is square and columnar, with a diameter of about 2-8 mm. Its surface color changes from gray green at the initial stage to brown brown and pubescent at the later stage.
Lychee cyme, inflorescence 10-25 cm long, will extend when bearing fruit; bracts are lanceolate, longer or shorter than calyx; pedicel and inflorescence axis are densely sparsely pilose; calyx is bell shaped, with yellow brown gland spots. Corolla is light red, light purple, blue violet to blue.
Litchi grass nuts are obovoid, brown in color, with glandular spots. The fruit period is from June to July.
