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Cyperus
Family: Cyperaceae
Cyperus image
Max Licher  
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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.
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Species within inventory project: || << 1 - 50 taxa >>
Bulbostylis striata
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not available
Cyperus acuminatus
Image of Cyperus acuminatus
Cyperus aethiops
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Cyperus affinis
Image of Cyperus affinis
Cyperus aggregatus
Image of Cyperus aggregatus
Cyperus ajax
Image of Cyperus ajax
Cyperus albescens
Image of Cyperus albescens
Cyperus albopurpureus
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Cyperus albostriatus
Image of Cyperus albostriatus
Cyperus alopecuroides
Image of Cyperus alopecuroides
Cyperus alternifolius
Image of Cyperus alternifolius
Cyperus amabilis
Image of Cyperus amabilis
Cyperus amauropus
Image of Cyperus amauropus
Cyperus amuricus
Image of Cyperus amuricus
Cyperus anderssonii
Image of Cyperus anderssonii
Cyperus andinus
Image of Cyperus andinus
Cyperus andreanus
Image of Cyperus andreanus
Cyperus angolensis
Image of Cyperus angolensis
Cyperus antillanus
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Cyperus arenarius
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Cyperus aristulatus
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Cyperus aromaticus
Image of Cyperus aromaticus
Cyperus arsenei
Image of Cyperus arsenei
Cyperus articulatus
Image of Cyperus articulatus
Cyperus aschenbornianus
Image of Cyperus aschenbornianus
Cyperus aterrimus
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Cyperus auriculatus
Image of Cyperus auriculatus
Cyperus baldwinii
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Cyperus baronii
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Cyperus bifax
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Cyperus bipartitus
Image of Cyperus bipartitus
Cyperus blodgettii
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Cyperus brainerdii
Image of Cyperus brainerdii
Cyperus breedlovei
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Cyperus breviculmis
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Cyperus brunneus
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Cyperus bushii
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Cyperus calcicola
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Cyperus calderoniae
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Cyperus camagueyensis
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Cyperus camphoratus
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Cyperus canus
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Cyperus capensis
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Cyperus capillifolius
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Cyperus capitatus
Image of Cyperus capitatus
Cyperus castaneus
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Cyperus celluloso-reticulatus
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Cyperus cephalanthus
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Cyperus chalaranthus
Image of Cyperus chalaranthus
Cyperus chorisanthos
Image of Cyperus chorisanthos
The National Science Foundation
Developments of SEINet, Symbiota, and associated specimen databases have been supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)