Annual plant, very aromatic, erect, up to 2 m in height, covered with long hairs. Alternate or opposite bipinnatifid leaves, 3 to 10 cm in length. Greenish male flowers in long terminal buds, female flowers in leaf axils. Fruit in ovoid, angular and thorny achenes, 3 to 4 mm in length.

Annual erect plant, up to 2 m in height.  Leaf with three membranous leaflets, oval to ovate, 6 to 12 cm in length.  Flowers, 10 to 20 in number, pink, in peduncles.  Pod (fruit) linear, slightly curved, up to 30 cm in length, with three longitudinal ribs in each valve.  Ellipsoid seeds, approx. 2 cm in length, white with a brown mark.