Complete list of species
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| scientific name | common name(s) | image gallery |
| 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 |
