Rio Grande Sedge (Cyperus floribundus)
Description
Cyperus uniflorus Torrey & Hooker var. floribundus K-kenthal in H. G. A. Engler, Pflanzenr. 20[IV,101]: 521. 1936; C. uniflorus Torrey & Hooker 1836, not Thunberg 1825 Herbs, perennial, cespitose, rhizomatous. Culms trigonous, basally tuberous thickened, 15-40 cm - 1-2.5 mm, glabrous. Leaves flat to V-shaped, 10-30 cm - 1-2 mm. Inflorescences: spike 1, densely oblong to ellipsoid, 8-36 - 8-20 mm; rays 4-12, 10-20 cm; bracts 3-6, horizontal to ascending at 30-, V-shaped, 3-15 cm - (3-)4-5.8 mm; rachilla deciduous, wings 0.5-0.7 mm wide. Spikelets (5-)20-35(-60), linear to oblong, quadrangular; 4-12(-21) - 0.7-1.2 mm, base narrowed to 0.4-1 mm; floral scales persistent, 1-3(-5), appressed, laterally whitish to reddish brown, stramineous with reddish spots, medially green, laterally 3-6-ribbed (midrib distinctly scabrid at 30X), narrowly oblong to ovate, 2.6-4.8 - 1.6-2 mm; apex rounded to - acute, entire, with mucro 0.3-0.5 mm; sterile terminal scale involute, 0.4-0.6 mm wide, uncinate; distal floral scales with cusp 0.6-1.9. Flowers: anthers 0.5-1.3 mm; styles 0.4-0.5 mm; stigmas 0.5-0.9 mm. Achenes light brown to reddish brown, sessile to slightly stipitate, narrowly ellipsoid, 1.8-2.4 - 0.6-0.8 mm, apex slightly apiculate, surfaces puncticulate. Fruiting mid summer-early fall (Jul-Sep). Damp, disturbed soils, croplands; 0-1000 m; Tex.; Mexico.
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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