Botanical name: Cyperus exaltatus Family: Cyperaceae (Sedge family)
Tall Flat Sedge is a stout bunch-forming perennial herb. Culms are trigonous, smooth, 1-1.8 m tall, up to 8 mm in diameter. Leaves are not septate-nodulose, as long as culms or longer, 5-15 mm wide. Inflorescence is compound or decompound, with 5-10 primary branches up to 18 cm long; spikes narrow-cylindrical, 2-5 cm long, 0.5-1.5 cm diameter; involucral bracts leaf-like, 4-6 to 90 cm long. Spikelets are flattened, numerous per spike, 4-18 mm long, 1-2 mm wide, 6-44-flowered; rachilla broadly winged, persistent. Tall Flat Sedge is found in Tropical Africa, Tropical & Subtropical Asia to Australia, Argentina. In India it is found from Rajasthan to NE India, and also Western Ghats.
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The flower labeled Tall Flat Sedge is ...