Cyperus articulatus

Cyperus articulatus L., Sp. Pl. 44 1753. (Syn: Chlorocyperus articulatus (L.) Rikli; Chlorocyperus cordobensis Palla; Cyperus articulatus Benth. [Illegitimate]; Cyperus articulatus var. conglomeratus Britton; Cyperus articulatus var. erythrostachys Graebn.; Cyperus articulatus var. fistulosus Kük.; Cyperus articulatus f. longispiculosus Kük.; Cyperus articulatus var. multiflorus Kük.; Cyperus articulatus var. nodosus (Humb. & Bonpl. ex Willd.) Kük.; Cyperus autumnalis Pursh [Illegitimate]; Cyperus borbonicus Steud.; Cyperus cordobensis (Palla) Hicken; Cyperus corymbosus var. pangorei Rottb.; Cyperus corymbosus var. subnodosus (Nees & Meyen) Kük. ex Osten; Cyperus corymbosus var. subnodosus (Nees & Meyen) Kük.; Cyperus fistulosus Ehrenb. ex Boeckeler; Cyperus gymnos Schult.; Cyperus interceptus Steud.; Cyperus niloticus Forssk.; Cyperus nodosus Humb. & Bonpl. ex Willd.; Cyperus nodosus var. aphyllus Boeckeler; Cyperus nodosus var. subnodosus (Nees & Meyen) Boeckeler; Cyperus pertenuis Roxb.; Cyperus subarticulatus Nees & Meyen [Invalid]; Cyperus subnodosus Nees & Meyen; Papyrus pangorei Nees);
 

Perennial, 1-2 m. Stolons, e.g. 3 mm diam., covered by brown or reddish-brown scales, longer than internodes. Stem 4-8 mm diam., terete or obtusely trigonous, green or greyish green, "noded" by transversal internal tissue plates. Leaves reduced; sheaths to 40 cm, soft, yellowish-brown or often reddish, mouth oblique; blades of uppermost sheaths up to 30 mm. Inflorescence a compound anthelodium, 9-16 cm; bracts to 9-30 mm, upright, rigid; primary branches 7-15, up to 12 cm; secondary anthelodia 15-50 mm, with bracts to 8 mm, secondary branches up to 20 mm; cluster of spikes of 5-14 spreading spikes, globular or slightly elongated, greyish green or brown; spikes 5-25 x c.1.5 mm, slightly compressed, with 8-24 glumes, glume-like bract to 2 mm, acute, glume-like prophyll bi-nerved, base spongy; rachis c. 0.5 mm wide, internodes c. 0.8 mm, winged; glumes c. 3 mm, cymbiform, obtuse, mid-nerve area greenish, later pale yellow, with several nerves ending below apex, sides pale yellow, brown or reddish-brown, margins widely scarious. Nut c. 1.6 x 0.5 mm, narrowly obovoid, trigonous, sides concave, brown or silvery brown, glossy, finely reticulate and papillose.
Flowering and fruiting: March-April
Marshy areas
Pantropics
Attributions- Dr. N Sasidharan (Dr. B P Pal Fellow), Kerala Forest Research Institute, Peechi)

 
 
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Plant for ID xvii6 posts by 4 authors. Attachments (7).
Found in Bannerghatta Bangalore
June

Elaeocharis ?...
Cyperus articulatus L. , tall sedge near lake and river
Thank you all.
I will try and get better details of plant soon to confirm ID.
For now, Cyperus articulatus L. suggested by ... 
Looks like Cyperus articulatus L., may be the inflorescence is not well-developed. So I need a specimen to confirm the identity.
 
  
 
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