339. Carex filipes Franchet & Savatier, Enum. Pl. Jap. 2: 576. 1878.
丝柄薹草 si bing tai cao
Rhizome short or slightly long. Culms 30-55 cm tall, compressed trigonous, smooth, clothed with purple-red bladeless sheaths at base. Leaves shorter than culm, blades linear, 2-8 mm wide, flat, soft, apex acuminate. Involucral bracts leaflike, shorter than inflorescence, long sheathing. Spikes 3 or 4, distant; terminal spike male, oblong-lanceolate or cylindric, 2-3 cm, with long peduncle; lateral spikes female, loosely usually 3-6-flowered, peduncle 3-6 mm, very slender, pendent. Female glumes yellow-brown or yellow-white, ovate or ovate-lanceolate, 5-6 mm, green 3-veined costa ending at acute apex. Utricles yellow-green, longer than glume, ovate or elliptic, trigonous, 5-7 mm, glabrous, faintly many veined, base cuneate, shortly stipitate, apex abruptly contracted into a slender long beak, orifice 2-toothed. Nutlets stramineous, broadly obovate or ovate, trigonous, 2.5-3 mm; style base not thickened; stigmas 3. Fl. and fr. Mar-May.
Forests, wet places on roadsides, grasslands; 1300-2200 m. Anhui, Fujian, Guizhou, Hebei, Heilongjiang, Hubei, Jiangsu, Liaoning, Zhejiang [Japan, Korea, Russia (Far East)].