Plants erect, main stem unbranched or with ascending branches from base, 2–50 cm, densely hairy distally, hairs stellate, 1–3-armed, arms to 2 mm. Leaf blades 3-cleft to beyond middle, usually 2–5 cm wide, divisions toothed to subcleft distally. Inflorescences usually exceeding leaves. Pedicels mostly 1–8 cm, longer in fruit; involucellar bractlets linear, (2.5–)4–10(–15) mm. Flowers bisexual or pistillate; calyx 4.5–13 mm, lobes 3.2–11 × 1.5–4 mm; petals white or pale to deep mauve, 5.5–20(–25) mm, equaling or exceeding calyx. Mericarps 9–22, brownish to blackish, ± wedge-shaped, cushionlike, 1.5–1.8 mm, margins rounded, radially corrugated.
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