Plants perennial, with caudices. Stems erect, to 50 cm. Leaves: petiole to 3 mm (proximal leaves), absent (distal leaves); blade ovate to hastate, rarely elliptic, basally lobed or unlobed, to 10 × 5 cm, base usually cuneate to truncate, sometimes acute, margins usually serrate, sometimes crenate, rarely entire, apex acute. Pedicels (fruiting) 0–2.5 × 2 mm. Flowers: petals orange, (6–)8–18.5 × (3–)4–10.5 mm, apex cuspidate, hairy abaxially on distal 1/2; stamens 15–45, 5–9.5 mm, filaments monomorphic, filiform; styles 5–10 mm. Capsules subcylindric to clavate, (5–)7–17 × 2–3.5 mm, base tapering gradually, capsule and pedicel not well-differentiated, walls thick, woody. Seeds (1–)2–3(–4) per capsule, oblong, without transverse folds. 2n = 20, 22.
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Hypanthium ovoid to cylindric or obconic; sep 5; pet 5–10; stamens 10–200, distinct or connate into fascicles; ovules 2–many on 3 parietal placentas; style 3-lobed; fr a capsule; annual or perennial herbs or shrubs, armed with stiff, barbed hairs, with alternate, serrate to pinnatifid lvs and 1–many often large, white to yellow or orange fls terminating the branches. (Nuttallia) 50, New World.
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