Annual, 60–150 cm high, with numerous short branches. Anchor hairs mainly 2-hooked. Peduncles 0.5–2 cm long; peduncular bracts few, clearly separate from involucral bracts. Capitula usually 30–200 or more, 6–7 mm long and 3–5 mm wide at anthesis, 7–9 mm long and 5–6 mm wide in fruit. Involucre of c. 20–26 bracts in 1–2 outer and 2 inner rows, with longest outer bracts not more than 1/2 as long as inner bracts.; outer involucral bracts straight, appressed or slightly squarrose, narrowly lanceolate to linear, 2.0–5.0 mm long, 0.4–0.9 mm wide, not wider than inner bracts; margin glabrous; midrib with a simple line of straight, 0.4–1.2 mm long hairs. Achenes including cuspis c. 3.9–4.5 mm long; cuspis c. 0.5–0.9 mm long, c. 1/8–1/5 of total achene length.
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