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Cyperus
Family: Cyperaceae
Cyperus image
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Gordon C. Tucker*, Brian G. Marcks* & J. Richard Carter * in Flora of North America (vol. 23)
Herbs, perennial or less often annual, cespitose or not, rhizomatous, stoloniferous, rarely tuberous. Culms solitary or not, trigonous or round, glabrous or scabridulous with extrorse or antrorse (rarely retrorse) prickles. Leaves usually basal; ligules absent; blades keeled abaxially, flat, V-, or inversely W-shaped in cross section. Inflorescences terminal, rarely pseudolateral, 1st order subumbellate to capitate, 2d order with spicate or digitately arranged spikelets, rarely a solitary spikelet; spikelets 1-150; 1st order rays unequal (rarely equal) in length, produced singly from the axils of inflorescence bracts; involucral bracts 1-22, spirally arranged at culm apex, spreading to erect, leaflike. Spikelets: scales to 76, distichous, each subtending flower, cylindric to compressed, borne spicately or digitately at ends of rays (occasionally proliferous). Flowers bisexual [rarely unisexual], in axils of distichous floral scales, bases often decurrent onto rachilla as ± hyaline wings; perianth absent; stamens 1-3; styles linear, 2-3-fid, base deciduous or persistent; stigmas 2-3. Achenes biconvex, flattened, or trigonous.
Vascular plants of NE US and adjacent Canada
Scales distichous, the lowermost one empty and ±modified; fls perfect, each in the axil of a scale; perianth wanting; stamens 3, less often 1 or 2; style 2-3- cleft, the beakless (or nearly beakless) achene accordingly lenticular or ±trigonous; spikelets few-many in dense or loose spikes or heads, each subtended by 2 small bracts; spikes or heads commonly in a simple or compound terminal umbel that is subtended by sheathless, leafy invol bracts; each ray of the umbel surrounded at base by a tubular prophyll; herbs with solid, ±triangular stems, the lvs with closed sheath and usually an elongate, grasslike blade. 600+, cosmop. Our spp. belong to 5 subgenera, as in the following key. Spp. 14-22 and 23-28 appear to be intergradient, presumably reflecting extensive hybridization.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

©The New York Botanical Garden. All rights reserved. Used by permission.
Species within inventory project: SERNEC State Inventories || << 1 - 50 taxa >>
Cyperus acuminatus
Image of Cyperus acuminatus
Cyperus aggregatus
Image of Cyperus aggregatus
Cyperus amuricus
Image of Cyperus amuricus
Cyperus aristulatus
Image of Cyperus aristulatus
Cyperus articulatus
Image of Cyperus articulatus
Cyperus bipartitus
Image of Cyperus bipartitus
Cyperus blodgettii
Image of Cyperus blodgettii
Cyperus cephalanthus
Image of Cyperus cephalanthus
Cyperus compressus
Image of Cyperus compressus
Cyperus croceus
Image of Cyperus croceus
Cyperus cuspidatus
Image of Cyperus cuspidatus
Cyperus dentatus
Image of Cyperus dentatus
Cyperus diandrus
Image of Cyperus diandrus
Cyperus difformis
Image of Cyperus difformis
Cyperus digitatus
Image of Cyperus digitatus
Cyperus dipsaciformis
Image of Cyperus dipsaciformis
Cyperus distans
Image of Cyperus distans
Cyperus distinctus
Image of Cyperus distinctus
Cyperus drummondii
Image of Cyperus drummondii
Cyperus echinatus
Image of Cyperus echinatus
Cyperus elegans
Image of Cyperus elegans
Cyperus entrerianus
Image of Cyperus entrerianus
Cyperus eragrostis
Image of Cyperus eragrostis
Cyperus erythrorhizos
Image of Cyperus erythrorhizos
Cyperus esculentus
Image of Cyperus esculentus
Cyperus fendlerianus
Image of Cyperus fendlerianus
Cyperus filicinus
Image of Cyperus filicinus
Cyperus filiculmis
Image of Cyperus filiculmis
Cyperus flavescens
Image of Cyperus flavescens
Cyperus flavicomus
Image of Cyperus flavicomus
Cyperus floribundus
Image of Cyperus floribundus
Cyperus fugax
Image of Cyperus fugax
Cyperus fuscus
Image of Cyperus fuscus
Cyperus giganteus
Image of Cyperus giganteus
Cyperus globulosus
Image of Cyperus globulosus
Cyperus granitophilus
Image of Cyperus granitophilus
Cyperus grayi
Image of Cyperus grayi
Cyperus grayoides
Image of Cyperus grayoides
Cyperus haspan
Image of Cyperus haspan
Cyperus hemidrummondii
Image of Cyperus hemidrummondii
Cyperus houghtonii
Image of Cyperus houghtonii
Cyperus hystricinus
Image of Cyperus hystricinus
Cyperus hystricoides
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not available
Cyperus involucratus
Image of Cyperus involucratus
Cyperus iria
Image of Cyperus iria
Cyperus laevigatus
Image of Cyperus laevigatus
Cyperus lancastriensis
Image of Cyperus lancastriensis
Cyperus lanceolatus
Image of Cyperus lanceolatus
Cyperus lecontei
Image of Cyperus lecontei
Cyperus lentiginosus
Image of Cyperus lentiginosus
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