Carex alba Scopoli subsp. ussuriensis (Komarov) Kükenthal.

Rhizome stoloniferous, stolons slender. Culms loosely tufted, 20-40 cm tall, obtusely trigonous, smooth, bladeless sheathed at base. Leaves nearly equaling height of culm, blades ca. 0.5 mm wide, slightly revolute on margins, slightly soft, yellow-brown sheathed. Involucral bracts sheathlike, up to 2 cm, broadly membranous on margin of sheathing mouth, without involucral bract leaf. Spikes 2 or 3, slightly remote; terminal spike male, usually surpassing adjacent female spike, lanceolate-linear, 1-2 cm; lateral spikes female, oblong, 0.5-1 cm, very loosely 2-4-flowered; rachis flexuose; peduncles slender, up to 3 cm. Female glumes yellowish, ovate or subelliptic, ca. 3 mm, membranous, 1-veined, basal part enclosing rachis, margins broadly hyaline, apex hard mucronate. Utricles yellow-green, dark brown at maturity, suberect, nearly equaling glume, obovate, indistinctly trigonous, ca. 3 mm, subleathery, not shiny, glabrous, several slightly concave veined, base broadly truncate or subrounded, apex abruptly narrowed to a short beak, orifice truncate. Nutlets rather tightly enveloped in utricle, obovate, trigonous, ca. 2 mm; style base thickened; stigmas 3, slender. Fl. and fr. Jun-Jul.

Needle-leaved forests, shady and wet places. Heilongjiang, Jilin, Nei Mongol, Shaanxi [Japan, Korea, Russia (Far East)].