Perennials; glabrous or sparsely pubescent. Rhizomes cylindrical, slender, to 2 mm diam. Stems erect, unbranched, (1.5–) 2.5–8.5 (–10) dm, sparsely to densely hirsute at base. Rhizomal leaves 3 (or 5) -foliolate, (4–) 7–20 (–22) cm, leaflets petiolulate or subsessile; petiole (2–) 4–12 (–14) cm; lateral leaflets subsessile, blade similar to terminal, larger or smaller in size; terminal leaflet petiolulate [(0.3–) 0.5–1.5 cm], blade ovate to broadly lanceolate, 1.5–7 (–9) cm, base usually cuneate, rarely subreniform or obtuse, margins 3–5 (–7) -lobed or toothed, surfaces puberulent. Cauline leaves (3 or) 4–8, 3 (or 5) -foliolate, petiolate, leaflets petiolulate or sessile; petiole 1–4 cm, base not auriculate; lateral leaflets sessile, blade similar to terminal, smaller, margins usually dentate, rarely entire; terminal leaflet sessile or petiolulate, blade broadly ovate to narrowly lanceolate, 2–7 cm × 6–40 mm, margins minutely pubescent. Racemes ebracteate. Fruiting pedicels ascending to divaricate, (9–) 12–25 mm. Flowers: sepals oblong, 2.5–4 × 1.3–2 mm, lateral pair saccate basally; petals usually white, rarely pinkish, obovate, 8–15 × 4–8 mm (clawed, apex rounded or emarginate); filaments: median pairs 3.5–6 mm, lateral pair 2–3.5 mm; anthers oblong, 0.8–1.2 mm. Fruits linear, 1.5–3.2 cm × 1.4–2 mm; ovules 10–16 per ovary; style (0.5–) 1–4 mm. Seeds dark-brown, oblong, 1.8–2.3 × 1–1.2 mm. 2n = 40.

Phenology: Flowering Apr–Jun.
Habitat: Moist ground, stream banks, swampy or damp woods, thickets, wet meadows
Elevation: 0-900 m

Distribution

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B.C., Alaska, Calif., Oreg., Wash.

Discussion

Selected References

None.

Lower Taxa

None.

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