节苞水葱 jie bao shui cong

Scirpus articulatus Linnaeus, Sp. Pl. 1: 47. 1753; Schoenoplectiella articulata (Linnaeus) Lye; Schoenoplectus pseudoarticulatus (L. K. Dai & S. M. Huang) S. Yun Liang & S. R. Zhang; Scirpus pseudoarticulatus L. K. Dai & S. M. Huang.

Plants 30-85 cm tall (including involucral bract). Rhizomes shortly creeping. Culms densely tufted, 12-30 cm tall, 5-7 mm thick, terete, transversely septate, clothed at base with 1 or 2 bladeless leaf sheaths. Leaf sheaths 10-25 cm, terete, obliquely truncate at mucronate mouth. Involucral bract 1, erect, culmlike, usually longer than culm, with many transverse septate nodes. Inflorescence a pseudolateral head with many spikelets. Spikelets sessile, ovoid, 7-9 × 4-4.5 mm, many flowered. Glumes brownish yellow with dark brown lines, deltoid-ovate, 5-5.5 mm, concave, thinly membranous, veins many and ± conspicuous, apex with a costa excurrent into a mucro. Perianth bristles absent. Stamens 3; stigmas 3. Nutlet yellowish gray at maturity, obovoid, 2-2.2 mm, 3-sided, smooth. Fl. and fr. May-Jul.

Moist places, pond margins; low elevations. S Hainan (Sanya) [India, Indonesia, Nepal, Papua New Guinea, Philippines, Sri Lanka, Thailand, Vietnam; Africa, N Australia, Indian Ocean islands, Madagascar].

This species is widely distributed and very variable in the size of its vegetative parts. The Hainan plants were separated (as Scirpus pseudoarticulatus) mainly by their taller culms and relatively more pointed spikelets, but such features certainly fall within the variation range of Schoenoplectus articulatus.