Strawcolored flatsedge (Cyperus croceus)
Description
Cyperus baldwinii Torrey; C. cyclostachyus Grisebach; C. echinatus (Linnaeus) Alph. Wood var. multiflora Chapman; C. globulosus Aublet var. pseudofiliculmis K-kenthal; C. globulosus var. robustus (Boeckeler) Shinners; C. plankii Brittton; C. retrorsus Chapman var. robustus K-kenthal; Mariscus bracheilema Steudel; M. brittonii C. B. Clarke Herbs perennial, cespitose. Culms trigonous, (4-)14-45 cm - 1-2 mm, glabrous. Leaves yellow-green, flat, 18-44 cm - 3-4.5 mm. Inflorescences: spikes densely to loosely globose to ovoid, 10-20 mm wide; rays (3-)5-9(-14), 1-15(-26) cm; rachis 3-6(-9) mm; bracts (4-)6-9(-11), horizontal to ascending at 45-, flat, 1-30 cm - 0.5-4 mm; rachilla deciduous, wings persistent, 0.3-0.5(-0.8) mm wide. Spikelets (10-)30-50, oblong to lanceoloid, quadrangular to subterete, compressed, 4-8 - 1-1.3 mm; distal spikelet spreading or ascending; floral scales persistent, (1-)2-4(-6), appressed, whitish with red speckles, laterally 2-4-ribbed, ovate, 2.3-3.6 - 1.8-2.2 mm. Flowers: anthers 0.5 mm; styles 0.6-1.3 mm; stigmas 1.2-2.6 mm. Achenes reddish brown to nearly black, sessile, oblong, ellipsoid, 2-2.4 - 0.4-0.5(-0.7) mm, apex - truncate-emarginate, apiculate, surfaces puncticulate.
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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