Compared to other species of the genus, it is generally thinner. There are elongated rhizomes underground. The whole plant is almost hairless, the stem is upright, 20 to 50 cm in height, and the base of the internode of the stem is slightly puffy and reddish. The leaves are countered and have a reddish petiole, the leaf blade is 3 to 8 cm long oval to oval, sharp at the tip, round at the base and low wavy serrations at the edges. Branch to the tip of the stem to form the inflorescence, and attach a small flower with a flower pattern downward. The inflorescences are 6 to 10 cm long and have no hair. Sepals are two red. There are two petals from white to light red, with a shallow tip and three fissures. There are two stamens, which alternate with petals. A single style with a lower ovary covered with a key-like stab. The fruit is a long egg-shaped nut, 2 to 2.5 mm in diameter, with no grooves and a dense hook-like sting. There are two seeds inside.