山东白鳞莎草 shan dong bai lin suo cao

Cyperus nipponicus Franchet & Savatier f. hilgendorfianus (Boeckeler) Kükenthal; C. shandongense F. Z. Li.

Annuals. Roots fibrous. Culms tufted, 10-35 cm tall, 3-angled, basally with 1-3 leaves. Leaves shorter to rarely longer than culm; leaf blade 2-4 mm wide. Involucral bracts 5-9, leaflike, several times as long as inflorescence. Inflorescence a simple anthela; rays 3-6, longest 4-6 cm. Spikelets many, densely aggregated at apex of each ray, narrowly ovoid to oblong, 4-6 × ca. 1.5 mm, compressed, 10-20-flowered; rachilla wings white, narrow, hyaline. Glumes pale on both surfaces but middle green, slightly laxly imbricate, ovate, ca. 2 mm, several veined, apex mucronate. Stamens 2; anthers narrowly oblong. Style ca. 1 mm; stigmas 2. Nutlet yellowish brown, ellipsoid, ca. 1 mm, plano-convex or concave-convex.

Wet places at water margins; ca. 100 m. S Heilongjiang, Shandong (Tai’an) [Japan].