Annual herb (10–) 20–100 (–150) cm high; stems erect, glabrous or sparsely hairy. Leaves petiolate, usually bipinnatifid or bipinnatisect, sometimes bipinnate, ±ovate in outline, (2–) 6–12 (–16) cm long, (1.5–) 3–7 (–10) cm wide, glabrous or sparsely hispid; lobes linear to narrowly lanceolate (broadly lanceolate to ovate in var. subalternans). Capitula ovoid, 5–10 mm diam.; outer involucral bracts linear to narrowly oblong, 4–15 (–20) mm long, sometimes slightly dilated at tip, marginally ciliate, dorsally subglabrous or hispid; inner bracts linear-lanceolate, usually glabrous (but often with short cilia at tip). Ray florets rudimentary, often absent, yellow. Achenes dimorphic, linear, black; outer achenes 8–9 mm long, not tapering, pilose throughout, with awns U-divergent; inner achenes 8–17 mm long, tapering to apex, glabrous or pilose in upper part, with awns erect. Pappus awns 2 or 3 (4), 1–2.5 mm long.
More
An annual herb. It grows 2 m high and spreads 1 m wide. The leaves can have 2 or several leaflets. These are deeply dissected. The flowers are yellow.
Home
