三阳薹草 san yang tai cao

Carex sachalinensis F. Schmidt var. duvaliana (Franchet & Savatier) T. Koyama; C. tenuissima Boott var. duvaliana (Franchet & Savatier) Kükenthal.

Rhizome short, with creeping stolons. Culms tufted, 20-35 cm tall, slender, obtusely trigonous, puberulent. Leaves slightly shorter than culm, blades pale green, 1.5-3 mm wide, flat, puberulent; basal sheaths pale yellow to pale brown, densely puberulent. Lower involucral bracts with blades, longer than subtending spike, long sheathed, sheath 1-4.5 mm, upper involucral bracts bristlelike, shortly sheathed, puberulent. Spike 3-5, spaced, sometimes upper ones slightly contiguous; terminal spike male, cylindric, 15-22 × 2-3 mm, with peduncle 1.5-2 cm; lateral spikes female, cylindric, 10-20 × 2-3 mm, loosely flowered, with peduncle enclosed in involucral bract sheath or shortly exserted. Female glumes yellowish white, obovate, ca. 3 mm, green costa 1-3-veined, rather prominent and excurrent into a short awn. Utricles pale green, longer than glume, ovate-fusiform, trigonous, 3.5-4 mm, membranous, many veined, sparsely puberulent, base attenuate into a stipe 0.5-1 mm, apex contracted into a medium-sized beak ca. 1 mm, orifice 2-toothed. Nutlet tightly enveloped, ovate, trigonous, 1.5-2 mm, base shortly stipitate, stipe slightly bent, apex discoid-annulate; style short, base conically thickened; stigmas 3. Fl. and fr. May.

Waysides on mountain slopes, forest margins; 600-1700 m. Anhui [Japan].