Description from Flora of China
Blysmocarex macrantha (Boeckeler) K. V. Ivanova; B. macrantha subsp. nudicarpa (Y. C. Yang) D. S. Deng; B. nudicarpa Y. C. Yang; Kobresia macrantha var. nudicarpa (Y. C. Yang) P. C. Li; K. nudicarpa (Y. C. Yang) S. R. Zhang.
Rhizomes elongate, slender, stoloniferous. Basal sheaths pale brown, retaining dried leaf blades. Culms scattered, erect, trigonous, 3-17 cm tall, 1-1.5 mm in diam. Leaves basal, shorter than culms; blade flat, 1-3 mm wide, midrib distinct abaxially. Inflorescence paniculate, cylindric to ovoid, 1-2 × 0.6-1 cm; inflorescence branches androgynous or unisexual (whole inflorescence sometimes ± unisexual), lowest branch sometimes slightly distant; lowest involucral bract leaflike or glumelike, apex long aristate. Spikelets usually unisexual; glumes chestnut-brown with green midvein, ovate to ovate-lanceolate, 4-6.3 × 2-2.3 mm, margin broadly hyaline, apex acute or obtuse. Prophylls yellowish brown, ovate-lanceolate, 3-3.6 × 1.2-2 mm, thinly membranous, 2-keeled, keels smooth, margins free or connate at base. Nutlets elliptic-ovoid or subcircular, flattened, 1.4-2 × 0.8-1 mm, not beaked, conspicuously stipitate, stipe 0.6-1 mm. Sterile rachilla of female spikelets terete, minute, subequaling stipe of nutlet. Stigmas 2, very long. Fl. and fr. Jun-Aug.
Open ground, sandy soils, meadows in river valleys; 2500-4800 m. Gansu, Qinghai, Sichuan, Xinjiang, Xizang [Nepal].