异株薹草 yi zhu tai cao

Carex cobresiiformis A. I. Baranov & Skvortsov; C. dioica Linnaeus subsp. gynocrates (Wormskjöld ex Drejer) Hultén; C. dioica var. gynocrates (Wormskjöld ex Drejer) Ostenfeld.

Rhizome slender, creeping. Culms loosely tufted, 20-30 cm tall, smooth, leafy on lower 1/4. Basal leaf sheaths rusty brown, eventually pale brown, split into fibers. Blades shorter than culm, ca. 0.5 mm wide, smooth. Plants dioecious, male plant not seen; inflorescence 1-spiked, terminal; female spike brown, narrowly cylindric, 1.5-1.8 × ca. 0.2 cm. Female glumes rusty brown, broadly ovate, apex acute. Utricles nearly equaling to slightly longer than glume (ripe specimens not seen), 2-2.5 mm, slenderly veined on both surfaces, apex gradually attenuate into a short beak, orifice minutely 2-toothed; stigmas 2.

Bogs in forests; ca. 900 m. Jilin [Japan, Russia (Far East, E Siberia); North America].