An aromatic annual or short-lived perennial herb, usually 20–90 cm tall, with erect, branched stems densely covered in soft glandular hairs, giving the plant a sticky (viscid) texture. Leaves are alternate, sessile or shortly winged at the base, with elliptic to oblanceolate or obovate blades measuring 2–10 × 0.6–6 cm; the margins are serrate to dentate, the apex acute to rounded, and both surfaces are densely pubescent and gland-dotted. Numerous small capitula are borne in terminal and axillary panicles, each enclosed by several series of hairy involucral bracts. The outer florets are numerous and female, while the inner florets are bisexual, with corollas pink to purplish or occasionally whitish. The fruit is a small cylindrical, pubescent achene, crowned with a persistent white pappus of slender bristles that facilitates wind dispersal. The entire plant is characteristically aromatic when crushed and commonly grows in open, disturbed, or seasonally moist habitats.