Perennials; usually glabrous, rarely sparsely pubescent basally. Rhizomes cylindrical, slender (rarely slightly thickened at stem base), 1–3 (–4) mm diam. Stems erect or decumbent basally, unbranched or branched, (0.6–) 1.5–6 (–7) dm. Rhizomal leaves absent. Cauline leaves 3–8 (–11), 3 or 5-foliolate (rarely only terminal leaflet present), petiolate, leaflets petiolulate or subsessile; petiole (0.7–) 1–4 (–6) cm, base not auriculate; lateral leaflets (when present) subsessile or petiolulate (to 0.4 cm), blade similar to terminal, often much smaller and narrower than terminal; terminal leaflet (petiolule 0.4–1.6 cm), blade usually ovate to orbicular, rarely subcordate, 1.5–4 (–5) cm × 15–35 (–50) mm, base truncate, rounded, or cordate, margins crenate, dentate, sinuate, or to 11-lobed. Racemes ebracteate. Fruiting pedicels ascending to divaricate-ascending, (7–) 10–20 mm. Flowers: sepals oblong, 2–3 (–3.8) × 1–1.5 mm, lateral pair not saccate basally; petals white, oblanceolate, 3.5–6 (–7) × 1.5–2.5 (–3) mm (not clawed, apex rounded or ± emarginate); filaments: median pairs 2.5–3.5 mm, lateral pair 2–2.5 mm; anthers oblong, 0.7–1 mm. Fruits linear, 1.5–3.5 cm × 1–1.5 mm; ovules 14–28 per ovary; style 0.2–1.5 (–2.5) mm. Seeds brown, oblong, 1–1.6 × 0.9–1.1 mm.

Phenology: Flowering Jun–Jul.
Habitat: Stream banks, seepage, lakeshores, creeks, wet meadows, swamps, ponds
Elevation: 1200-3000 m

Distribution

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B.C., Calif., Colo., Idaho, Mont., Nev., Oreg., Utah, Wash., Wyo.

Discussion

Selected References

None.

Lower Taxa

None.

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