豌豆形薹草 wan dou xing tai cao

Carex albomas C. B. Clarke; C. alterniflora Franchet; C. bauhwaensis Z. P. Wang; C. conicoides Honda; C. duvaliana Franchet & Savatier var. alterniflora (Franchet) Kükenthal ex Matsumura; C. fernaldiana H. Léveillé & Vaniot; C. pisiformis var. alterniflora (Franchet) T. Koyama; C. pisiformis var. fernaldiana (H. Léveillé & Vaniot) T. Koyama; C. pisiformis var. koreana (Nakai) T. Koyama; C. pisiformis f. polyschoena (H. Léveillé & Vaniot) Kükenthal; C. pisiformis var. sachalinensis (F. Schmidt) Kükenthal ex Matsumura; C. polyschoena H. Léveillé & Vaniot; C. sachalinensis F. Schmidt; C. sachalinensis subsp. alterniflora (Franchet) T. Koyama; C. sachalinensis var. alterniflora (Franchet) Ohwi; C. sachalinensis var. conicoides (Honda) Ohwi; C. sachalinensis subsp. fernaldiana (H. Léveillé & Vaniot) T. Koyama; C. sachalinensis var. fernaldiana (H. Léveillé & Vaniot) T. Koyama; C. umbrosa Host var. koreana Nakai.

Rhizome short or stoloniferous. Culms tufted, 15-50 cm tall, slender, compressed trigonous, smooth or slightly scabrid. Basal sheaths pale yellow-brown to rusty brown. Leaves shorter or longer than culm, blades 2-3(-4) mm wide, flat, margins scabrid. Involucral bracts sheathed, sheath 5-18 mm, lower ones leafy, upper ones bristlelike, shorter than or equaling inflorescence. Spikes 2-4, spaced; terminal spike male, narrowly cylindric, 15-20 mm; lateral spikes female, sometimes with male flowers at apex, oblong-cylindric or narrowly cylindric, 10-30 × 2-3 mm, loosely flowered, peduncles enclosed in involucral bract sheath or slightly exserted. Female glumes pale or pale brown, obovate, green costa 1-3-veined, excurrent into a mucro, apex truncate. Utricles pale yellow-green, longer than or nearly equaling glume, ovate-elliptic, obtusely trigonous, ca. 3 mm, densely puberulent, slightly many veined, base attenuate into a short stipe, apex attenuate into a conic beak, orifice 2-toothed. Nutlet gray-black at maturity, tightly enveloped, ovate, trigonous, ca. 1.5 mm, base shortly stipitate, apex discoid-annulate; stigmas 3. Fl. and fr. May-Jun.

Forests on mountain slopes, waysides; 400-1400 m. Anhui, Hebei, Liaoning, Shandong [Japan].