A tall annual herb reaching a height of 2 to 4 m, unbranched or with only a few side branches. The leaves are alternate, simple, lanceolate, long, with an acuminate tip and a finely serrated or lobed margin. The flowers are small about 2 to 3 cm in diameter and yellow, with five petals.
The fruit is a many-seeded capsule.
*above specification are indicative only. actual dimensions may vary by +-10%