Complete list of species
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| scientific name | common name(s) | image gallery |
| Cynoglossum virginianum var. boreale | Wild Comfrey | |
| Cynoglossum virginianum var. virginianum | Wild Comfrey Northern Wild Comfrey Southern Wild Comfrey Hound's-tongue | |
| Cynosciadium digitatum | Finger Dogshade Fringed Dogshade | |
| Cyperus acuminatus | Tapertip Flatsedge | |
| Cyperus aggregatus | Inflated-scale Flat Sedge Inflated-scale Flatsedge Inflatedscale Flatsedge | |
| Cyperus amabilis | Foothill Flat Sedge Foothill Flatsedge | |
| Cyperus articulatus | Jointed Flatsedge Chintul | |
| Cyperus auriculatus | Eared Flat Sedge Eared Flatsedge | |
| Cyperus bipartitus | Slender Flatsedge Shining Cyperus | |
| Cyperus cephalanthus | Buttonbush Flatsedge | |
| Cyperus compressus | Poorland Flatsedge | |
| Cyperus croceus | Baldwin's Flatsedge | |
| Cyperus cuspidatus | Coastal Plain Flatsedge Coastal-plain Flat Sedge | |
| Cyperus dentatus | Toothed Flatsedge | |
| Cyperus dentoniae | Hairy Flat Sedge Hairy Flatsedge | |
| Cyperus diandrus | Umbrella Flatsedge | |
| Cyperus digitatus | Finger Flat Sedge Finger Flatsedge | |
| Cyperus dipsaceus | Teasel-flatsedge Wright Flatsedge Wright's Flatsedge | |
| Cyperus distans | Mexican Flat Sedge Piedmont Flatsedge | |
| Cyperus distinctus | Swamp Flat Sedge Swamp Flatsedge | |
| Cyperus drummondii | Drummond's Sedge | |
| Cyperus echinatus | Globe Flatsedge | |
| Cyperus elegans | Royal Flatsedge | |
| Cyperus eragrostis | Tall Flatsedge Tall Cyperus | |
| Cyperus erythrorhizos | Redroot Flatsedge | |
| Cyperus esculentus | Yellow Nutsedge Chufa Sedge Yellow Nut-grass | |
| Cyperus esculentus var. hermannii | Heermann's Yellow Nutsedge Nut Grass Yellow Nutgrass Yellow Nutsedge | |
| Cyperus esculentus var. macrostachyus | Nut Grass Yellow Nutgrass Yellow Nutsedge | |
| Cyperus fauriei | Alpine Flatsedge Mariscus Fauriei | |
| Cyperus fendlerianus | Fendler's Flat Sedge Fendler's Flatsedge Fendler's Nutgrass Fendler’s Sedge | |
| Cyperus filicinus | Fern Flat Sedge Fern Flatsedge | |
| Cyperus filiformis | Florida Flat Sedge Florida Flatsedge Wiry Flat Sedge Wiry Flatsedge | |
| Cyperus flavescens | Pale Flatsedge Yellow Flat Sedge Yellow Flatsedge | |
| Cyperus flavicomus | Whiteedge Flatsedge | |
| Cyperus floribundus | Rio Grande Flat Sedge Rio Grande Sedge | |
| Cyperus floridanus | Florida Flat Sedge Florida Flatsedge | |
| Cyperus fugax | Withering Flat Sedge Withering Flatsedge | |
| Cyperus fuligineus | Limestone Flat Sedge Limestone Flatsedge | |
| Cyperus granitophilus | Granite Flatsedge | |
| Cyperus grayi | Eastern Gray's Flat Sedge Gray's Flatsedge Gray’s Sedge | |
| Cyperus grayoides | Illinois Flatsedge Mohlenbrock's Sedge Midwestern Gray's Flat Sedge | |
| Cyperus haspan | Haspan Flatsedge | |
| Cyperus hermaphroditus | Hermaphrodite Flatsedge | |
| Cyperus hillebrandii | Hillebrand's Flatsedge | |
| Cyperus hillebrandii var. decipiens | Hillebrand's Flatsedge | |
| Cyperus hillebrandii var. hillebrandii | Hillebrand's Flatsedge | |
| Cyperus houghtonii | Houghton's Flat Sedge Houghton's Flatsedge Houghton's Nutsedge Houghton's Umbrella-sedge | |
| Cyperus hypochlorus | Ahuawa Oahu Flatsedge | |
| Cyperus hypochlorus var. brevior | Ahuawa Oahu Flatsedge | |
| Cyperus hypochlorus var. hypochlorus | Ahuawa Oahu Flatsedge | |
| Cyperus hypochlorus var. kauaiensis | Oahu Flatsedge Ahuawa | |
| Cyperus hypopitys | Pine Flat Sedge Pine Flatsedge | |
| Cyperus hystricinus | Bristly Flatsedge | |
| Cyperus laevigatus | Maui Flat Sedge Smooth Flat Sedge Smooth Flatsedge Smooth Nutgrass | |
| Cyperus lancastriensis | Manyflower Flatsedge Porter's Sedge | |
| Cyperus lanceolatus | Epiphytic Flatsedge | |
| Cyperus lecontei | Le Conte's Flat Sedge Le Conte's Flatsedge | |
| Cyperus lentiginosus | Latin American Flat Sedge Latin American Flatsedge | |
| Cyperus ligularis | Alabama Swamp Flatsedge Ligulate Flatsedge Mangrove Flat Sedge | |
| Cyperus lupulinus | Great Plains Flatsedge | |
| Cyperus lupulinus ssp. lupulinus | Great Plains Flat Sedge Great Plains Flatsedge Hop Sedge | |
| Cyperus lupulinus ssp. macilentus | Great Plains Flatsedge Sand Cyperus | |
| Cyperus manimae | Smoothstem Flatsedge Spectacular Flat Sedge Spectacular Flatsedge | |
| Cyperus manimae var. asperrimus | Smoothstem Flatsedge Spectacular Flat Sedge Spectacular Flatsedge | |
| Cyperus mutisii | Mutis Flatsedge Mutis' Flat Sedge Mutis' Flatsedge | |
| Cyperus neokunthianus | Maui Flatsedge | |
| Cyperus niger | Black Flat Sedge Black Flatsedge Brown Cyperus | |
| Cyperus ochraceus | Pond Flatsedge Yellow Sedge | |
| Cyperus odoratus | Fragrant Flatsedge Fragrant Sedge | |
| Cyperus onerosus | Plains Flatsedge | |
| Cyperus ovatus | Ovate-leaf Flat Sedge Ovateleaf Flatsedge | |
| Cyperus oxylepis | Sharp-scale Flat Sedge | |
| Cyperus pallidicolor | Pale Flat Sedge Pallid Flatsedge | |
| Cyperus parishii | Parish Flatsedge Parish's Flat Sedge Parish's Flatsedge Parish's Nutgrass | |
| Cyperus pennatiformis | Coastal Flat Sedge Coastal Flatsedge | |
| Cyperus pennatiformis var. bryanii | Bryan's Flat Sedge Bryan's Flatsedge | |
| Cyperus pennatiformis var. pennatiformis | Coastal Flat Sedge Coastal Flatsedge | |
| Cyperus phleoides | Molokai Flat Sedge Molokai Flatsedge | |
| Cyperus phleoides var. hawaiensis | Molokai Flat Sedge Molokai Flatsedge | |
| Cyperus phleoides var. phleoides | Molokai Flat Sedge Molokai Flatsedge | |
| Cyperus planifolius | Flat-Leaf Flat Sedge Flatleaf Flatsedge | |
| Cyperus plukenetii | Plukenet's Flatsedge | |
| Cyperus polystachyos | Manyspike Flatsedge Bunchy Sedge | |
| Cyperus polystachyos var. miser | Bunchy Sedge Manyspike Flat Sedge Manyspike Flatsedge | |
| Cyperus polystachyos var. polystachyos | Bunchy Sedge Manyspike Flat Sedge Manyspike Flatsedge | |
| Cyperus polystachyos var. texensis | Bunchy Sedge Texan Flat Sedge Texan Flatsedge | |
| Cyperus pseudothyrsiflorus | Flat Sedge Flatsedge | |
| Cyperus pseudovegetus | Marsh Flatsedge Marsh Flat Sedge | |
| Cyperus reflexus | Bentawn Flatsedge | |
| Cyperus refractus | Reflexed Flat Sedge Reflexed Flatsedge Reflexed Umbrella-sedge | |
| Cyperus retroflexus | Oneflower Flatsedge | |
| Cyperus retrofractus | Rough Flatsedge | |
| Cyperus retrorsus | Pine Barren Flatsedge | |
| Cyperus retrorsus var. retrorsus | Pine Barren Flatsedge | |
| Cyperus retrorsus var. robustus | Pine Barren Flat Sedge Pine Barren Flatsedge | |
| Cyperus rockii | Kauai Flat Sedge Kauai Flatsedge | |
| Cyperus sandwicensis | Cliffs Flat Sedge Cliffs Flatsedge | |
| Cyperus schweinitzii | Schweinitz's Flatsedge | |
| Cyperus seslerioides | Texas Flat Sedge Texas Flatsedge | |
| Cyperus setigerus | Lean Flatsedge | |
| scientific name | common name(s) | image gallery |
