An erect branched, coarse, glabrous herbaceous
annual herb 3–180 cm tall with angular to
rounded stems and a tap root. Leaves deeply pinnatifi
d with 6–17 linear-lanceolate segments,
each segment 1–4 cm × 0.5–2 cm, glandular,
acute at both ends and margin serrate (Plates 1
and 2 ).