Very polymorphic. Shrubby or less often herbaceous, erect, much branched, 1–3 m. high, more or less densely spreading-hairy all over, rarely sparingly so or merely pubescent. Leaves from almost linear to elliptic, 2–10 cm. long, 0.2–3.8 cm. wide, acute or subacute at apex; petiole 0–4 mm. long, rarely more. Sepals 4, (4–) 6–13 mm. long, 1.5–5 mm. wide. Petals yellow, 6–16 mm. long, 4–16 mm. wide. Stamens twice as many as sepals. Apex of ovary, supporting the 2–6 mm. long style, flat or somewhat raised (to 2 mm.). Capsules thin-walled, puberulous to hairy, 1–4 cm. long, 1.5–4 mm. wide; pedicels 1–10 (–20) mm. long. Seeds pluriseriate in each cell, free, ellipsoid-oblong, narrow-raphed, 0.75–0.8 mm. long, 0.4 mm. wide, brown.