Schoenoplectus corymbosus (Roth ex Roem. & Schult.) J. Raynal

Perennial, to 150 cm. Rhizome short. Stem 5-10 mm diam., terete, finely grooved, smooth, green or grey green. Sheaths up to 13 cm, brown, disintegrating into fibres, mouth oblique, with widely scarious margins; blades reduced to mucro. Inflorescence a multiple spike or anthelodium, 45-150 mm diam., when bent to ground rooting from axils of bracts and lowest glumes; lowest bract 30-150 mm, terete, apex obtuse; primary branches 7-30, up to 100 mm, smooth or occasionally scabrous, each with group of 2-6 sessile spikes or with secondary multiple spike; tubular prophyll often keeled, scabrous; secondary branches to 40 mm, with 2-4 sessile spikes, or with more or less differentiated tertiary multiple spike; tertiary branches occasional, to 20 mm, with 1-3 spikes. Spikes 5-8 x 2-4 mm, ovoid; glumes 3-4 mm, cymbiform, mucro smooth, sides inconspicuously nerved, pale or reddish brown, smooth, margins not or narrowly scarious, not fringed. Perianth bristles reduced or weakly developed, unequal, to half of nut; stamens 3, anthers c. 2 mm; stigmas 3. Nut 1.9-2 x 1.2-1.3 mm, ellipsoid or obovoid, trigonous, plano-convex, edges obtuse, nearly smooth, dark brown, glossy.

Distribution: Most of Africa, from Egypt to S. Africa, Madagascar, Pakistan and W India from Sind to Mysore.

Fl. Per.: September - December.

In shallow water in pools and ditches.

Isolepis corymbosa Roth ex Roem. & Schult., Syst. Veg. 2:110. 1817. Scirpus corymbosus Heyne ex Roth (1821) non L. Schoenoplectus inclinatus (Del.) Lye in Bot. Notiser 124: 290. 1971. Isolepis inclinata Delile, Descr. Aegypte, Roem. & Schult.) J. Rayn. var. brachyceras (A. Rich.) Lye in Nord. J. Bot. 3: 242 (1983). Haines & Lye, Sedges and rushes E. Afr., Fig. 70 (1983, as var. brachyceras). J. Browning, S. Afr. J. Bot. 57: Figs. 3-4. 1991.

Robust perennial sedge, up to 1.5 m tall, often forming, partially submerged, dense stands. Stems round; leaves absent except for sheaths on the stems bases. Inflorescence sub-terminal, branched, reddish brown, borne at the base of an erect, sharply pointed bract, which does generally not overtop the inflorescence. A species used for weaving mats and baskets.

Schoenoplectus corymbosus on sarakasvien (Cyperaceae) heimoon kuuluva järvikaislalaji.

Schoenoplectus corymbosus là loài thực vật có hoa trong họ Cói. Loài này được (Roth ex Roem. & Schult.) J.Raynal miêu tả khoa học đầu tiên năm 1976.