Perennials; glabrous throughout. Rhizomes cylindrical, slender, 0.5–1.5 mm diam. Stems erect, unbranched, (0.6–) 1–2 (–3) dm. Rhizomal leaves pinnately 5 or 7-foliolate, (2–) 4–10 cm, (not fleshy), leaflets sessile; petiole (1.5–) 3–7 (–9) cm; lateral leaflets similar to terminal, blade sometimes smaller; terminal leaflet blade linear to narrowly oblong or narrowly lanceolate, (0.5–) 1–2.5 (–3.3) cm × 0.5–4 (–8) mm, base cuneate to attenuate, margins entire. Cauline leaves (1 or) 2 or 3, 5 or 7-foliolate, petiolate, leaflets sessile; petiole (0.2–) 0.5–1.2 (–1.5) cm, base not auriculate; lateral leaflets similar to terminal, blade smaller; terminal leaflet blade narrowly lanceolate to linear, 1–3.2 (–4) cm × 0.8–2.5 (–3.5) mm, base cuneate to attenuate, margins entire (apex acute to acuminate). Racemes ebracteate. Fruiting pedicels suberect to divaricate-ascending, (7–) 10–25 mm. Flowers: sepals ovate, 2.5–3.5 × 1.5–2.5 mm, lateral pair not saccate basally; petals white, obovate, 5–9 × 2.5–5 mm (clawed, apex rounded); filaments: median pairs 3–4.5 mm, lateral pair 1.5–2.5 mm; anthers oblong, 1–1.5 mm. Fruits linear, (1.5–) 2–4 cm × 1.5–2 mm; ovules 6–12 per ovary; style (1–) 1.5–2.5 (–4) mm. Seeds brown, oblong, 1.8–2.2 × 0.9–1.1 mm. 2n = 28, 42.

Phenology: Flowering Jun–Aug.
Habitat: Damp flats, stream banks, tundra, meadows, bluffs, hummocks, sandy beaches, slopes, mossy mats, sedge swales
Elevation: 0-1400 m

Distribution

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N.W.T., Yukon, Alaska, ne Asia (Russian Far East), ne Asia (Siberia)

Discussion

Selected References

None.

Lower Taxa

None.

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