Sibbaldiopsis tridentata (Aiton) Rydb.

Leaves: stipules 3–6 mm, margins villous-ciliate; petiole slender, (0.2–)0.5–6(–8) cm; leaflets dark green abaxially, light green adaxially, (0.5–)1–3(–4) × 0.4–1.5(–1.8) cm. Pedicels 2–35 mm, glabrous. Flowers: epicalyx bractlets lanceolate, 1–2 mm; sepals 2–3 mm, hirsute, glandular; petals white, sometimes pink-tinged, (4–)5–8[–11] mm; anthers reddish, 0.3–0.6 mm; styles 1–2.5(–3) mm. Achenes dark brown. 2n = 14, 28.