Cyperus flavoculmis

Cyperus flavoculmis is a robust perennial sedge growing to approximately 140 cm (55 in) tall. Arising from a 3–8 mm (0.12–0.31 in) thick upright woody rhizome, the triangular culms are 90–120 cm (35–47 in) long and 3–7 mm (0.12–0.28 in) wide. The culms are mostly smooth and yellow in colour on at least the lower half. The basal leaves, each measuring approximately 40–60 cm (16–24 in) long and 6–10 cm (2.4–3.9 in) wide, are flat and linear with a pointed tip and a roughened texture along the margins and veins. The 3–12 cm (1.2–4.7 in) long leaf sheaths are green and yellow, becoming purple towards the base, with transparent margins. The inflorescence bears five or six leaf-like involucral bracts, each measuring up to 50 cm (20 in) long and 9 mm (0.35 in) wide. The inflorescence itself is a compound anthela growing to 15–20 cm (5.9–7.9 in) long with seven to eight primary branches. The spikelets occur in loose clusters of six to thirty on straight rachia. The glumes are obovate and reddish-brown in colour with a narrow transparent margin. The flower bears three stamens and a three-branched style.^[3][4]

• List of Cyperus species