The stem is cylindrical without ridges, is 15 to 90 cm in height, has short glandular hairs, and divides many branches at the top. Leaves are opposite except for upper leaves, often have short petiole or sessile and often have stems, leaf blade 2 to 6 cm long, 7 to 30 mm wide, oval to lanceolate, blunt tip Shaped or sharp, base wide wedge-shaped to slightly heart-shaped, with rough serrated edges. Stems and leaves can be purple. Flowers grow singly from the axilla on the top of the stem. Those with a floral pattern that sticks to the base of the flower have glandular hairs in the ovary, which later becomes fruit. There are four sepals, the lobes are 4 to 7 mm long lanceolate, and glandular hairs are densely attached to the outer surface. The flower is pale red to red, about 8 mm in diameter, has four petals, and is egg-shaped with two split tips. The fruit is a four-ridged, elongated fruit, 3 to 8 cm in length, with short glandular hairs and dehiscence from the tip. The seeds are 1.5 to 1.8 mm long elliptical, with reddish-brown crown-like long hair (seed hair) and fly by the wind.