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Leaf-lamina up to 15 × 15 cm., obovate to broadly obovate in outline, rather sparsely pilose or setose on both surfaces, cuneate to obtuse at the base, midrib with a longitudinal fissure 2–3 mm. long near the base, 3–5-palmatipartite; lobes up to 12 × 2 cm., very narrowly elliptic, margins serrate; petiole up to 12 cm. long, hairy like the young stems; stipules 10–18 mm. long, linear.
Flowers 5–6 cm. in diam., yellow with reddish centre, solitary, axillary; peduncle 8–25 mm. long, articulated just below the middle, usually densely setose or setose-aculeate above the articulation, less densely so and more pubescent beneath it.
Annual (or perennial?) herb up to 1·3 m. tall; young stems with small rather sparse prickles and sometimes with an additional longitudinal line of crisped pubescence changing its radial position at each node.
Calyx 2–3·5 cm. long; lobes triangular, acute, pilose-setose and aculeolate especially on the margins and midrib, joined at the base.
Seeds c. 3·5×2 mm., subreniform, with concentric rings of minute scales, often glabrescent.
Staminal tube 20 mm. long; free parts of filaments c. 0·5 mm. long.
Epicalyx of 7–8 bracts; bracts 12–20 × 1–1·5 mm., linear, free.
Capsule up to 35 × 25 mm., ovoid, appressed-setose.
Petals c. 4 × 3 cm., almost glabrous.
Style-branches c. 1 mm. long.
