59. Carex peiktusani Komarov, Trudy Imp. S.-Peterburgsk. Bot. Sada. 18: 445. 1901.
白头山薹草 bai tou shan tai cao
Carex hancockiana Maximowicz var. peiktusani (Komarov) Kükenthal.
Rhizome short. Culms 30-60 cm tall, trigonous, clothed at base with purple sheaths slightly disintegrating into fibers. Leaves longer than culm, blades gray-green, linear, 2-4.5 mm wide, flat, margins scabrous, apex acuminate. Involucral bracts leaflike, longer than inflorescence, sheathless. Spikes 3 or 4; terminal spikes gynaecandrous, 2-2.5 cm, cylindric, with peduncle 0.7-1 cm; lateral spikes female, 1.8-2.5 mm, oblong or long cylindric, lowest spike 2-3 cm, slightly pendulous. Female glumes pale ferruginous or greenish whitish, lanceolate or ovate-lanceolate, 3-4 mm, 3-veined. Utricles yellowish green, obliquely patent, equaling or slightly longer than glume, elliptic, trigonous, 3.5-4 mm, 5- or 6-veined, apex gradually narrowed into a short beak, orifice 2-toothed. Nutlets obovate or obovate-elliptic, trigonous, ca. 2 mm, base shortly stipitate; stigmas 3. Fl. and fr. Jun-Aug.
Forests, riversides; 1000-1700 m. Hebei, Heilongjiang, Liaoning, Shandong, Shanxi [Korea, Russia (Far East)].