The stem is about 1.5 m (4.9 ft) long, and is slender and knotted. Leaves are olivaceous in color, triangular-lanceolate shaped, decussately arranged with leaf margins that are doubly crenate. Each leaf is about 10 cm (4 in) long and 5–10 cm (2–4 in) wide. The bottoms of the leaves are glabrous and they are covered with a woolly hair towards the apex. The leaf hairs are brown, and tips of the teeth are darker. The hairs on the stem, younger leaves, and petioles are white.