Bull. Soc. Bot. France 72: 1043. 1925.
Perennials; (cespitose); glabrous. Rhizomes absent. Stems erect, unbranched or, rarely, branched, 0.5–1.6 (–3.5) dm. Basal leaves (7 or) 9–21-foliolate, (thick, veins impressed); leaflets petiolulate or sessile; lateral lobes or leaflets similar to terminal; terminal lobe or leaflet blade orbicular, broadly ovate to lanceolate, base rounded to cuneate, margins usually entire. Cauline leaves 2–4 (–7), pinnatisect or pinnately compound, (7 or) 9–21-foliolate, (thick, veins impressed), petiolate, leaflets petiolulate or sessile; petiole base not auriculate; lobes or leaflets (of proximal leaves) (4–) 7–10 each side of rachis, fewer distally, distal leaves with 4 or 5 lobes or leaflets each side of rachis; terminal leaflet petiolulate or sessile, blade (or lobe) narrowly lanceolate to lanceolate, base cuneate, margins entire. Racemes ebracteate. Fruiting pedicels erect-ascending, 5–15 mm. Flowers: sepals oblong or ovate, 3.6–4.4 mm, lateral pair saccate basally, (green with hyaline margins); petals white-lilac, 9–12.3 × 4.8–6.8 mm, (clawed, apex rounded or emarginate); filaments: median pairs 3.5–4.5 mm, lateral pair 2–3 mm; anthers narrowly oblong, 0.9–1.4 mm. Fruits linear, 1–1.8 cm × ca. 1.5 mm; ovules ca. 16 per ovary; style ca. 1 mm, (stout). Seeds brown, oblong, ca. 1.5 mm. 2n = 56, 60, 64, 80–100.
Phenology: Flowering Jun–Aug.
Habitat: Wet meadows, marshes, margins of ponds, along streams, seacoasts, swamps
Greenland, Man., Nfld. and Labr., N.W.T., Nunavut, Que., Yukon, Alaska, n Eurasia
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