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Achenes c. 1 mm. long, very narrowly turbinate, narrowly to sharply 3–4(5)-ribbed, the apex truncate with a low rim confluent with the ribs and forming a distinct apical cup-like depression, the faces between the ribs somewhat flat and ± densely covered in glandular trichomes; pappus absent.
Leaves alternate, subsessile, mostly 4–10 x 0.6–2 cm., up to c. 17 x 3 cm. in well-grown plants, narrowly lanceolate-elliptic, apex ± tapering acute, base narrowly cuneate, margin obscurely dentate or serrulate, lamina puberulous with fine appressed hairs, glandular-punctate.
Phyllaries few-seriate, apices subacute to rounded, margins subhyaline, puberulous or glabrescent, ciliate, glandular above; outer phyllaries c. 1 mm. long and narrowly triangular, inner phyllaries to c. 2.3 mm. long and broadly lanceolate to elliptic-oblong.
Stems branched above, becoming somewhat woody below, leafy, ribbed, puberulous to tomentellous especially on young growth, sparsely glandular; hairs flagelliform.
Capitula numerous, short-stalked or subsessile in corymbiform-cymose clusters; synflorescence branches densely pubescent, bracteate with filiform bracts.
Corollas pale-purplish or lilac, 2–3 mm. long, exserted, narrowly funnel-shaped, limb deeply lobed, glandular otherwise glabrous.
Involucres 2–2.6 x 1.5–2 mm., to c. 2.5 mm. wide in fruiting capitula, turbinate-campanulate.
An erect annual herb to c. 1(1.3) m. tall (sometimes apparently perennial).
Florets 7–11(13) per capitulum.
