| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| CYSC3 | Cyperus schweinitzii Torr. | Schweinitz's flatsedge | Cyperaceae
|
| CYSE5 | Cyperus serotinus Rottb. | tidalmarsh flatsedge | Cyperaceae
|
| CYSE2 | Cyperus seslerioides Kunth | Texas flatsedge | Cyperaceae
|
| CYSE6 | Cyperus sesquiflorus (Torr.) Mattf. & K�kenth. ex K�kenth. | Kyllinga odorata | Cyperaceae
|
| CYSE3 | Cyperus setigerus Torr. & Hook. | lean flatsedge | Cyperaceae
|
| CYSPS2 | Cyperus speciosus Vahl var. squarrosus Britt. | Cyperus odoratus | Cyperaceae
|
| CYSP6 | Cyperus speciosus Vahl | Cyperus odoratus | Cyperaceae
|
| CYSP2 | Cyperus spectabilis Link | spectacular flatsedge | Cyperaceae
|
| CYSP3 | Cyperus sphacelatus Rottb. | roadside flatsedge | Cyperaceae
|
| CYSP7 | Cyperus sphaerolepis Boeckl. | Rusby's flatsedge | Cyperaceae
|
| CYSQR | Cyperus squarrosus L. var. runyonii (O'Neill) S.D. Jones & J. Wipff | Cyperus squarrosus | Cyperaceae
|
| CYSQ | Cyperus squarrosus L. | bearded flatsedge | Cyperaceae
|
| CYST2 | Cyperus stenolepis Torr. | Cyperus strigosus | Cyperaceae
|
| CYSTC | Cyperus strigosus L. var. capitatus Boeckl. | Cyperus strigosus | Cyperaceae
|
| CYSTM | Cyperus strigosus L. var. multiflorus Geise | Cyperus strigosus | Cyperaceae
|
| CYSTR | Cyperus strigosus L. var. robustior Britt. | Cyperus strigosus | Cyperaceae
|
| CYSTS | Cyperus strigosus L. var. stenolepis (Torr.) K�kenth. | Cyperus strigosus | Cyperaceae
|
| CYST | Cyperus strigosus L. | strawcolored flatsedge | Cyperaceae
|
| CYSU | Cyperus surinamensis Rottb. | tropical flatsedge | Cyperaceae
|
| CYSW | Cyperus swartzii (A. Dietr.) Boeckl. ex K�kenth. | Swartz's flatsedge | Cyperaceae
|
| CYTE12 | Cyperus tenerrimus Liebm. | flatsedge | Cyperaceae
|
| CYTE2 | Cyperus tenuifolius (Steud.) Dandy | Kyllinga pumila | Cyperaceae
|
| CYTEL | Cyperus tenuis Sw. var. lentiginosus (Millsp. & Chase) K�kenth. | Cyperus lentiginosus | Cyperaceae
|
| CYTE4 | Cyperus tenuis Sw. | crevice flatsedge | Cyperaceae
|
| CYTE5 | Cyperus tetragonus Ell. | fourangle flatsedge | Cyperaceae
|
| CYTH | Cyperus thyrsiflorus Jungh. | southern flatsedge | Cyperaceae
|
| CYTO | Cyperus torreyi Britt. | Cyperus retrorsus var. retrorsus | Cyperaceae
|
| CYTR2 | Cyperus trachysanthos Hook. & Arn. | sticky flatsedge | Cyperaceae
|
| CYTR3 | Cyperus trinervis R. Br. | Australian flatsedge | Cyperaceae
|
| CYUNP | Cyperus uniflorus Torr. & Hook. var. pseudothyrsiflorus K�kenth. | Cyperus retroflexus | Cyperaceae
|
| CYUN2 | Cyperus uniflorus Torr. & Hook., non Thunb. | Cyperus retroflexus | Cyperaceae
|
| CYUN4 | Cyperus unifolius Boeckl. | Cyperus filiformis | Cyperaceae
|
| CYUN3 | Cyperus unioloides R. Br. | uniola flatsedge | Cyperaceae
|
| CYUR | Cyperus urbanii Boeckl. | Urban's flatsedge | Cyperaceae
|
| CYVA2 | Cyperus vahlii (Schrad. ex Nees) Steud. | Cyperus flexuosus | Cyperaceae
|
| CYVE | Cyperus vegetus Willd. | Cyperus eragrostis | Cyperaceae
|
| CYVIA | Cyperus virens Michx. var. arenicola (Boeckl.) Shinners | Cyperus pseudovegetus | Cyperaceae
|
| CYVID | Cyperus virens Michx. var. drummondii (Torr. & Hook.) K�kenth. | Cyperus virens | Cyperaceae
|
| CYVI2 | Cyperus virens Michx. | green flatsedge | Cyperaceae
|
| CYWI5 | Cyperus winkleri Britt. ex Small | Cyperus retrorsus var. retrorsus | Cyperaceae
|
| CYWR | Cyperus wrightii Britt. | Cyperus dipsaceus | Cyperaceae
|
| CYPER | Cyperus L. | flatsedge | Cyperaceae
|
| CYBO4 | Cypheliopsis bolanderi (Tuck.) Vainio | Thelomma mammosum | Caliciaceae
|
| CYAN7 | Cyphelium andersonii Herre | Thelomma californicum | Caliciaceae
|
| CYBR12 | Cyphelium brachysporum Nadv. | soot lichen | Caliciaceae
|
| CYBR13 | Cyphelium brunneum W. A. Weber | soot lichen | Caliciaceae
|
| CYCA19 | Cyphelium caliciforme (Flotow) Zahlbr. | Thelomma occidentale | Caliciaceae
|
| CYCA20 | Cyphelium californicum (Tuck.) Zahlbr. | Thelomma californicum | Caliciaceae
|
| CYCA21 | Cyphelium carolinianum (Tuck.) Zahlbr. | Thelomma carolinianum | Caliciaceae
|
| CYCH6 | Cyphelium chloroconium (Tuck.) Zahlbr. | soot lichen | Caliciaceae
|
| CYFA6 | Cyphelium farlowii (Tuck. ex Herre) Herre | Thelomma californicum | Caliciaceae
|
| CYIN10 | Cyphelium inquinans (Sm.) Trevisan | soot lichen | Caliciaceae
|
| CYKA10 | Cyphelium karelicum (Vainio) Rasanen | soot lichen | Caliciaceae
|
| CYLU4 | Cyphelium lucidum (Th. Fr.) Th. Fr. | soot lichen | Caliciaceae
|
| CYNO3 | Cyphelium notarisii (Tul.) Blomb. & Forss. | Notaris' soot lichen | Caliciaceae
|
| CYOC5 | Cyphelium occidentale Herre | Thelomma occidentale | Caliciaceae
|
| CYOC6 | Cyphelium ocellatum (Korber) Trevisan | Thelomma ocellatum | Caliciaceae
|
| CYPI7 | Cyphelium pinicola Tibell | soot lichen | Caliciaceae
|
| CYSA6 | Cyphelium santi-jacobi (Tuck.) Zahlbr. | Texosporium santi-jacobi | Caliciaceae
|
| CYSE8 | Cyphelium sessile (Pers.) Trevisan | sessile soot lichen | Caliciaceae
|
| CYTIN | Cyphelium tigillare (Ach.) Ach. ssp. notarisii (Tul.) W. A. Weber | Cyphelium notarisii | Caliciaceae
|
| CYTI2 | Cyphelium tigillare (Ach.) Ach. | soot lichen | Caliciaceae
|
| CYTR9 | Cyphelium trachylioides (Nyl. ex Branth & Rostrup) Erichsen | soot lichen | Caliciaceae
|
| CYVE2 | Cyphelium ventricosulum (Mull. Arg.) Zahlbr. | Cyphelium inquinans | Caliciaceae
|
| CYPHE2 | Cyphelium Ach. | soot lichen | Caliciaceae
|
| CYMA21 | Cypholophus macrocephalus Weddell | Cypholophus moluccanus | Urticaceae
|
| CYMO12 | Cypholophus moluccanus (Blume) Miq. | Hawai'I lopleaf | Urticaceae
|
| CYPHO2 | Cypholophus Weddell | lopleaf | Urticaceae
|
| CYBE3 | Cyphomandra betacea (Cav.) Sendtner | tree tomato | Solanaceae
|
| CYCO17 | Cyphomandra costaricensis J. D. Smith | Cyphomandra hartwegii | Solanaceae
|
| CYCR8 | Cyphomandra crassifolia (Ortega) Kuntze | Cyphomandra betacea | Solanaceae
|
| CYHA12 | Cyphomandra hartwegii (Miers) Dunal | Hartweg's cyphomandra | Solanaceae
|
| CYPHO3 | Cyphomandra C. Martius ex Sendtner | cyphomandra | Solanaceae
|
| CYCR2 | Cyphomeris crassifolia (Standl.) Standl. | leachlobe cyphomeris | Nyctaginaceae
|
| CYGYS | Cyphomeris gypsophiloides (Mart. & Gal.) Standl. var. stewartii I.M. Johnston | Cyphomeris gypsophiloides | Nyctaginaceae
|
| CYGY | Cyphomeris gypsophiloides (Mart. & Gal.) Standl. | red cyphomeris | Nyctaginaceae
|
| CYPHO | Cyphomeris Standl. | cyphomeris | Nyctaginaceae
|
| CYAC3 | Cypripedium acaule Ait. | moccasin flower | Orchidaceae
|
| CYANF | Cypripedium �andrewsii A.M. Fuller var. favillianum (J.T. Curtis) Boivin (pro nm.) | Cypripedium favillianum | Orchidaceae
|
| CYANL2 | Cypripedium �andrewsii A.M. Fuller var. landonii (Garay) Boivin (pro nm.) | Cypripedium andrewsii | Orchidaceae
|
| CYAN2 | Cypripedium �andrewsii A.M. Fuller | | Orchidaceae
|
| CYAR5 | Cypripedium arietinum Ait. f. | ram's head lady's slipper | Orchidaceae
|
| CYCAP3 | Cypripedium calceolus L. ssp. parviflorum (Salisb.) Hult�n | Cypripedium parviflorum | Orchidaceae
|
| CYCAP | Cypripedium calceolus L. var. parviflorum (Salisb.) Fern. | Cypripedium parviflorum | Orchidaceae
|
| CYCAP4 | Cypripedium calceolus L. var. planipetalum (Fern.) Victorin & Rouss. | Cypripedium pubescens var. pubescens | Orchidaceae
|
| CYCAP2 | Cypripedium calceolus L. var. pubescens (Willd.) Correll | Cypripedium pubescens var. pubescens | Orchidaceae
|
| CYCA4 | Cypripedium californicum Gray | California lady's slipper | Orchidaceae
|
| CYCA5 | Cypripedium candidum Muhl. ex Willd. | white lady's slipper | Orchidaceae
|
| CYFA | Cypripedium fasciculatum Kellogg ex S. Wats. | clustered lady's slipper | Orchidaceae
|
| CYFA4 | Cypripedium �favillianum J.T. Curtis | | Orchidaceae
|
| CYFU7 | Cypripedium furcatum Raf. | Cypripedium pubescens var. pubescens | Orchidaceae
|
| CYGUY2 | Cypripedium guttatum Sw. ssp. yatabeanum (Makino) Hult�n | Cypripedium guttatum var. yatabeanum | Orchidaceae
|
| CYGUG | Cypripedium guttatum Sw. var. guttatum | spotted lady's slipper | Orchidaceae
|
| CYGUY | Cypripedium guttatum Sw. var. yatabeanum (Makino) Pfitzer | spotted lady's slipper | Orchidaceae
|
| CYGU | Cypripedium guttatum Sw. | spotted lady's slipper | Orchidaceae
|
| CYKE2 | Cypripedium kentuckiense C.F. Reed | Kentucky lady's slipper | Orchidaceae
|
| CYMO2 | Cypripedium montanum Dougl. ex Lindl. | mountain lady's slipper | Orchidaceae
|
| CYPAM3 | Cypripedium parviflorum Salisb. var. makasin (Farw.) Sheviak | Cypripedium pubescens var. makasin | Orchidaceae
|
| CYPAP3 | Cypripedium parviflorum Salisb. var. pubescens (Willd.) Knight | Cypripedium pubescens var. pubescens | Orchidaceae
|
| CYPA19 | Cypripedium parviflorum Salisb. | lesser yellow lady's slipper | Orchidaceae
|
| CYPAM2 | Cypripedium passerinum Richards. var. minganense Victorin | Cypripedium passerinum | Orchidaceae
|