Cyperus exaltatus

 Images by Surajit Koley, (For more photos & complete details, click on the link), (inserted by Bhagyashri Ranade)

Erect, tufted, shortly rhizomatous perennials; rhizome short, woody; culms robust, 60-130 cm tall, trigonous, smooth. Leaves few, basal, 15-45 x 0.6-1.2 cm, linear, acute, flat, scabrid on margins; sheaths 5-20 cm long, spongy, purple-brown. Inflorescence compound to decompound, 15-30 cm across; leafy bracts 4-6, the longest upto 45 cm long; primary rays 5-9, unequal. Spike 2-5 x 1-1.5 cm, cylindrical, digitately disposed, subsessile or peduncled. Spikelets 6-10 x 1-2 mm, linear, flattened, reddish-brown. Glumes 1.5-2 x 1-1.5 mm, ovate, obtuse, mucronate, keel green, sides brown. Stamens 3. Stigmas 3. Nut c. 1 x 0.5 mm, elliptic, trigonous, yellow-brown. 
Flowering and fruiting: August-December 
Wetlands and grasslands
Bengal Plants has two species, both are likely to be found in our area -
  • Cyperus radiatus Vahl. = C. verticillatus Roxb., with 3 ft. stem (Bengal Plants & FBI) or 4 ft. (2 to 6) in FI (NOTE : the size in FoC & FoP)
  • Cyperus exaltatus Retz. = C. umbellatus Vahl. & C. alopecuroides Rottb. with 3 - 6 ft. stem
This cyperus, i found today in a DOBA (small degraded pond), above the waterline.
It has a culm of about 3 ft.
The following links represent C. imbricatus Retz., i think -