Plants synoecious. Rootstock erect or decumbent, to 0.5-2 cm diam. Floral stems often persistent, 10-60 × 0.2-0.6 cm. Leaf blades green, not glaucous, linear-oblong to linear-oblanceolate, 1-4.5 × 0.2-0.7 cm, margins entire or few-toothed, apex mostly acute. Inflorescences spikelike or subcapitate, dense, to ca. 50-flowered, 1-3.5 cm diam. Pedicels mostly to 5 mm. Flowers bisexual, mostly 5-6-merous; sepals linear-lanceolate, 3-9 mm; petals nearly erect with tips outcurved, greenish or white to rose, linear-lanceolate to linear-oblanceolate, 6-13 mm, longer than stamens. Follicles 6-9 mm, beaks erect. Seeds short-tailed, oblong, 2 mm. 2n = 14.
Wet meadows, stream banks, rockfields, rock crevices; at elevations from 2,000-4,200 metres. Moist places in tundra or in meadows and by streams in the Rocky Mountains to 2700 metres.