Annual, aromatic, erect, stout, pilose, branched herb; leaves opposite, decussate or upper ones whorled, pinnate, leaflets lanceolate-oblong, acute at apex, cuneate with yellow orbicular glands at base, margins remotely dentate; heads heterogamous, solitary on long peduncles, terminal or axillary; receptacle convex, pitted; involucral bracts 1-seriate, connate, glandular; ray florets female or neutral, 1-seriate, ligulate, 2-3 toothed; disk florets bisexual, fertile, tubular, 5-toothed or ligulate; pappus with 1-2 long awned scales and 2-3 sharp bristles at the top; stamens-5, syngenecious, epipetalous; ovary oblong, inferior, 1-locular, 1-ovuled, basal placenta; achenes black, angled, pappus scales shorter than achenes, white.