Oahu Flatsedge (Cyperus hypochlorus)
Description
Tufted annual with a shallow root system and 5-30 cm long stems. Leaves 5-15 cm long and 2-5 mm wide, flat, scabrid on margin and midrib; leaf-sheaths grey to reddish brown. Inflorescence of a few crowded spikes or with 1-few sessile spikes and 1-8 stalked spikes on 0.5-10 cm long peduncles; involucral bracts 3-6, leafy, erect or spreading, the largest 6-25 cm long and 1.5-6 mm wide, flat. Spikes 6-22 mm long and 6-16 mm wide, with (3-)5-10(-25) spreading spikelets. Spikelets 3-8 x 1.5-3.5 mm, ovate-lanceolate, appearing spiny with the spreading tips of the glumes. Glumes 2-3 mm long, golden or greyish with a green midrib excurrent in a recurved mucro and with 2-4 very prominent lateral nerves on each side of the midrib. Style with 2 branches. Nutlet 1.3-1.5 x 1-1.2 mm, flattened, somewhat cordate, brown to dark grey, minutely papillose.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum: Magnoliophyta
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Class: Liliopsida
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Order: Poales
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Family: Cyperaceae
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Genus: Cyperus
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