Botanical name: Cyperus flavidus    Family: Cyperaceae (Sedge family)
Synonyms: Cyperus divaricatus, Cyperus curvatus, Cyperus humifusus

Yellow Flatsedge is a clustered annual or perennial herb. Stems are trigonous, smooth, 5-60 cm high, 1-1.5 mm in diameter. Leaves are shorter or longer than stems, mostly 1-2 mm wide. Inflorescence is simple or nearly compound with 2-6 primary branches up to 5 cm long, or head-like. Spikes are ovoid to broad-ovoid, up to 3 cm in diameter, involucral bracts leaf-like, 2-4 exceeding inflorescence. Spikelets are flattened, 5-20 per spike, 1.0-2.5 cm long, 1.5-2.5 mm wide in side view, 12-50-flowered; rachilla not winged, persistent. Glumes are blunt, with 3-nerved midrib, 1.5-2.5 mm long, 1-1.5 mm wide, yellow-brown to very dark brown with hyaline margins. Yellow Flatsedge is widely distributed in S. Europe, Africa, W. & C. Asia, India, China, Japan, Malaysia, at altitudes of 200-3800 m. It is also found in the Himalayas.

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The flower labeled Yellow Flatsedge is ...