Opposite, reaching 5 inches in length, circular to heart-shaped, with hairs on the upper leaf surfaces and along the veins of the lower surface. Leaf margins have rounded teeth. Stems below the cotyledons become purple with age. The base of the cotyledon is notched where it joins the petiole. Young leaves occur on petioles, are circular to heart-shaped, opposite, and have distinctly 'crinkled' upper surfaces.
Hairs occur on the upper leaf surfaces and along the veins of the lower surface.
Stems root at the lower nodes, are square in cross section and are covered with downward-pointing hairs. Occur in whorls in the upper leaves without petioles. The fruit are egg-shaped nutlets reaching 2 mm in length and are brown with white spots.