| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CYLO8 | Cyperus louisianensis Thieret | Louisiana flatsedge | Cyperaceae
|
| CYLUL | Cyperus lupulinus (Spreng.) Marcks ssp. lupulinus | Great Plains flatsedge | Cyperaceae
|
| CYLUM | Cyperus lupulinus (Spreng.) Marcks ssp. macilentus (Fern.) Marcks | Great Plains flatsedge | Cyperaceae
|
| CYLU2 | Cyperus lupulinus (Spreng.) Marcks | Great Plains flatsedge | Cyperaceae
|
| CYLU3 | Cyperus lutescens Torr. & Hook. | Cyperus esculentus var. macrostachyus | Cyperaceae
|
| CYLU | Cyperus luzulae auct. non (L.) Rottb. ex Retz. | Cyperus entrerianus | Cyperaceae
|
| CYMAE2 | Cyperus macrocephalus Liebm. var. eggersii (Boeckl.) S.D. Jones, J. Wipff & R. Carter | Cyperus odoratus | Cyperaceae
|
| CYMA20 | Cyperus macrocephalus Liebm. | Cyperus odoratus | Cyperaceae
|
| CYMAA | Cyperus manimae Kunth var. asperrimus (Liebm.) K�kenth. | spectacular flatsedte | Cyperaceae
|
| CYMA4 | Cyperus manimae Kunth | spectacular flatsedte | Cyperaceae
|
| CYMA16 | Cyperus martindalei auct. non Britt. | Cyperus lupulinus ssp. lupulinus | Cyperaceae
|
| CYME11 | Cyperus melanostachyus Kunth | Cyperus niger | Cyperaceae
|
| CYME2 | Cyperus �mesochoreus Geise | Cyperus schweinitzii | Cyperaceae
|
| CYME3 | Cyperus metzii (Hochst. ex Steud.) Mattf. & K�kenth. ex K�kenth. | Kyllinga squamulata | Cyperaceae
|
| CYME4 | Cyperus meyenianus Kunth | Meyen's flatsedge | Cyperaceae
|
| CYMI5 | Cyperus microdontus Torr. | Cyperus polystachyos var. texensis | Cyperaceae
|
| CYMI4 | Cyperus microiria Steud. | Cyperus amuricus | Cyperaceae
|
| CYMO10 | Cyperus monostachyos L. | Abildgaardia ovata | Cyperaceae
|
| CYMU9 | Cyperus multiflorus (Britt.) Small | Cyperus croceus | Cyperaceae
|
| CYMUA | Cyperus mutisii (Kunth) Griseb. var. asper (Liebm.) K�kenth. | Cyperus mutisii | Cyperaceae
|
| CYMU4 | Cyperus mutisii (Kunth) Griseb. | Mutis' flatsedge | Cyperaceae
|
| CYNAN2 | Cyperus nanus Willd. var. nanus | Indian flatsedge | Cyperaceae
|
| CYNAS | Cyperus nanus Willd. var. subtenuis K�kenth. | Indian flatsedge | Cyperaceae
|
| CYNA2 | Cyperus nanus Willd. | Indian flatsedge | Cyperaceae
|
| CYNA3 | Cyperus nashii Britt. | Cyperus retrorsus var. retrorsus | Cyperaceae
|
| CYNE2 | Cyperus neokunthianus K�kenth. | Cyperus laevigatus | Cyperaceae
|
| CYNI5 | Cyperus nieuwlandii Geise | Cyperus flavescens | Cyperaceae
|
| CYNIC | Cyperus niger Ruiz & Pav�n var. capitatus (Britt.) O'Neill | Cyperus niger | Cyperaceae
|
| CYNIC2 | Cyperus niger Ruiz & Pav�n var. castaneus (Pursh) K�kenth. | Cyperus niger | Cyperaceae
|
| CYNIR | Cyperus niger Ruiz & Pav�n var. rivularis (Kunth) V. Grant | Cyperus bipartitus | Cyperaceae
|
| CYNI2 | Cyperus niger Ruiz & Pav�n | black flatsedge | Cyperaceae
|
| CYNU4 | Cyperus nuttallii Eddy | Cyperus filicinus | Cyperaceae
|
| CYOB5 | Cyperus obesus Liebm. | Cyperus aggregatus | Cyperaceae
|
| CYOB6 | Cyperus obtusatus (J. & K. Presl) Mattf. & K�kenth. | Kyllinga vaginata | Cyperaceae
|
| CYOC2 | Cyperus ochraceus Vahl | pond flatsedge | Cyperaceae
|
| CYODA | Cyperus odoratus L. var. acicularis (Schrad. ex Nees) O'Neill | Cyperus odoratus | Cyperaceae
|
| CYODE | Cyperus odoratus L. var. engelmannii (Steud.) R. Carter & S.D. Jones | Cyperus odoratus | Cyperaceae
|
| CYODS | Cyperus odoratus L. var. squarrosus (Britt.) S.D. Jones, J. Wipff & R. Carter | Cyperus odoratus | Cyperaceae
|
| CYOD | Cyperus odoratus L. | fragrant flatsedge | Cyperaceae
|
| CYON | Cyperus onerosus M.C. Johnston | plains flatsedge | Cyperaceae
|
| CYOV3 | Cyperus ovatus Baldwin | ovateleaf flatsedge | Cyperaceae
|
| CYOVC | Cyperus ovularis (Michx.) Torr. var. cylindricus (Ell.) Torr. | Cyperus retrorsus var. retrorsus | Cyperaceae
|
| CYOVS | Cyperus ovularis (Michx.) Torr. var. sphaericus Boeckl. | Cyperus echinatus | Cyperaceae
|
| CYOV | Cyperus ovularis (Michx.) Torr. | Cyperus echinatus | Cyperaceae
|
| CYOX | Cyperus oxylepis Nees ex Steud. | sharpscale flatsedge | Cyperaceae
|
| CYPA24 | Cyperus pallidicolor (K�kenth.) G. Tucker | pallid flatsedge | Cyperaceae
|
| CYPA20 | Cyperus paniculatus Rottb. | Cyperus polystachyos var. polystachyos | Cyperaceae
|
| CYPA8 | Cyperus papyrus L. | papyrus | Cyperaceae
|
| CYPA4 | Cyperus parishii Britt. | Parish's flatsedge | Cyperaceae
|
| CYPE2 | Cyperus pedunculatus (R. Br.) J. Kern | Remirea maritima | Cyperaceae
|
| CYPEB | Cyperus pennatiformis K�kenth. var. bryanii K�kenth. | Bryan's flatsedge | Cyperaceae
|
| CYPEP | Cyperus pennatiformis K�kenth. var. pennatiformis | coastal flatsedge | Cyperaceae
|
| CYPE3 | Cyperus pennatiformis K�kenth. | coastal flatsedge | Cyperaceae
|
| CYPE4 | Cyperus peruvianus (Lam.) F.N. Williams | Kyllinga tibialis | Cyperaceae
|
| CYPH | Cyperus phaeolepis Cherm. | Madagascar flatsedge | Cyperaceae
|
| CYPHH | Cyperus phleoides (Nees ex Kunth) Hbd. var. hawaiensis (Mann) K�kenth. | Molokai flatsedge | Cyperaceae
|
| CYPHP | Cyperus phleoides (Nees ex Kunth) Hbd. var. phleoides | Molokai flatsedge | Cyperaceae
|
| CYPH2 | Cyperus phleoides (Nees ex Kunth) Hbd. | Molokai flatsedge | Cyperaceae
|
| CYPI | Cyperus pilosus Vahl | fuzzy flatsedge | Cyperaceae
|
| CYPL4 | Cyperus planifolius L.C. Rich. | flatleaf flatsedge | Cyperaceae
|
| CYPL3 | Cyperus plukenetii Fern. | Plukenet's flatsedge | Cyperaceae
|
| CYPO7 | Cyperus pollardii Britt. ex Small | Cyperus ovatus | Cyperaceae
|
| CYPOF | Cyperus polystachyos Rottb. var. filicinus (Vahl) C.B. Clarke | Cyperus filicinus | Cyperaceae
|
| CYPOL | Cyperus polystachyos Rottb. var. laxiflorus Benth. | Cyperus polystachyos var. texensis | Cyperaceae
|
| CYPOL3 | Cyperus polystachyos Rottb. var. leptostachyus Boeckl. | Cyperus polystachyos var. polystachyos | Cyperaceae
|
| CYPOM2 | Cyperus polystachyos Rottb. var. macrostachyus Boeckl. | Cyperus filicinus | Cyperaceae
|
| CYPOM | Cyperus polystachyos Rottb. var. miser K�kenth. | manyspike flatsedge | Cyperaceae
|
| CYPOP | Cyperus polystachyos Rottb. var. pallidus Hbd. | Cyperus polystachyos var. polystachyos | Cyperaceae
|
| CYPOP3 | Cyperus polystachyos Rottb. var. paniculatus (Rottb.) C.B. Clarke | Cyperus polystachyos var. polystachyos | Cyperaceae
|
| CYPOP2 | Cyperus polystachyos Rottb. var. polystachyos | manyspike flatsedge | Cyperaceae
|
| CYPOT | Cyperus polystachyos Rottb. var. texensis (Torr.) Fern. | Texan flatsedge | Cyperaceae
|
| CYPO | Cyperus polystachyos Rottb. | manyspike flatsedge | Cyperaceae
|
| CYPR12 | Cyperus praelongatus Steud. | Cyperus setigerus | Cyperaceae
|
| CYPR | Cyperus pringlei Britt. | Cyperus mutisii | Cyperaceae
|
| CYPR17 | Cyperus prolifer Lam. | miniature flatsedge | Cyperaceae
|
| CYPR2 | Cyperus prolixus Kunth | mosquito flatsedge | Cyperaceae
|
| CYPS | Cyperus pseudovegetus Steud. | marsh flatsedge | Cyperaceae
|
| CYPU3 | Cyperus pumilus L. | low flatsedge | Cyperaceae
|
| CYRA7 | Cyperus radiatus Vahl | Cyperus imbricatus | Cyperaceae
|
| CYREF | Cyperus reflexus Vahl var. fraternus (Kunth) Kuntze | Cyperus reflexus | Cyperaceae
|
| CYRE2 | Cyperus reflexus Vahl | bentawn flatsedge | Cyperaceae
|
| CYRE3 | Cyperus refractus Engelm. ex Boeckl. | reflexed flatsedge | Cyperaceae
|
| CYRE14 | Cyperus retroflexus Buckl. | oneflower flatsedge | Cyperaceae
|
| CYRED | Cyperus retrofractus (L.) Torr. var. dipsaciformis (Fern.) K�kenth. | Cyperus retrofractus | Cyperaceae
|
| CYREH | Cyperus retrofractus (L.) Torr. var. hystricinus (Fern.) K�kenth. | Cyperus hystricinus | Cyperaceae
|
| CYRE4 | Cyperus retrofractus (L.) Torr. | rough flatsedge | Cyperaceae
|
| CYREC | Cyperus retrorsus Chapman var. cylindricus (Ell.) Fern. & Grisc. | Cyperus retrorsus var. retrorsus | Cyperaceae
|
| CYRED2 | Cyperus retrorsus Chapman var. deeringianus (Britt. ex Small) Fern. ex Grisc. | Cyperus retrorsus var. retrorsus | Cyperaceae
|
| CYREN | Cyperus retrorsus Chapman var. nashii (Britt.) Fern. & Grisc. | Cyperus retrorsus var. retrorsus | Cyperaceae
|
| CYRER2 | Cyperus retrorsus Chapman var. retrorsus | pine barren flatsedge | Cyperaceae
|
| CYRER | Cyperus retrorsus Chapman var. robustus (Boeckl.) K�kenth. | pine barren flatsedge | Cyperaceae
|
| CYRE5 | Cyperus retrorsus Chapman | pine barren flatsedge | Cyperaceae
|
| CYRI | Cyperus rivularis Kunth | Cyperus bipartitus | Cyperaceae
|
| CYRO10 | Cyperus robustus Kunth | Cyperus virens | Cyperaceae
|
| CYRO2 | Cyperus rockii K�kenth. | Kauai flatsedge | Cyperaceae
|
| CYRO | Cyperus rotundus L. | nutgrass | Cyperaceae
|
| CYRU | Cyperus rusbyi Britt. | Cyperus sphaerolepis | Cyperaceae
|
| CYSA4 | Cyperus sabulosus (Mart. & Schrad. ex Nees) Steud. | Cyperus flavicomus | Cyperaceae
|
| CYSAP | Cyperus sandwicensis K�kenth. var. pseudoprescottianus K�kenth. | Cyperus sandwicensis | Cyperaceae
|
| CYSA | Cyperus sandwicensis K�kenth. | cliffs flatsedge | Cyperaceae
|
| CYSA3 | Cyperus sanguindentus Vahl | purpleglume flatsedge | Cyperaceae
|