Co - Cy
| Colchicum autumnale | Zeitlose Herbst | Autumn Crocus | Colchicaceae |
| Colchicum bulbocodium | Zeitlose Lichtblumen | Spring Meadow Saffron | Colchicaceae |
| Coleostephus myconis | Wucherblume Kranz | Mediterranean Goldilocks | Asteraceae |
| Coleostephus paludosus | Wucherblume Sumpf | Fen Goldilocks | Asteraceae |
| Collomia grandiflora | Leimsaat Großblütige | Mountain Trumpet | Polemoniaceae |
| Collomia linearis | Leimsaat Schmalblättrige | Tiny Trumpet | Polemoniaceae |
| Colocasia esculenta | Zehrwurz Essbare | Taro | Araceae |
| Colutea arborescens | Blasenstrauch Gelber | Yellow Bladder Senna | Fabaceae |
| Colutea brevialata | Blasenstrauch Kurzflügeliger | French Bladder Senna | Fabaceae |
| Colutea cilicica | Blasenstrauch Kilikischer | Cilician Bladder Senna | Fabaceae |
| Colutea hispanica | Blasenstrauch Spanischer | Spanish Bladder Senna | Fabaceae |
| Colutea insularis | Blasenstrauch Rhodischer | Rhodian Bladder Senna | Fabaceae |
| Colutea melanocalyx ssp. davisii | Blasenstrauch Davis' | Davis's Bladder Senna | Fabaceae |
| Colutea orientalis | Blasenstrauch Östlicher | Blood- spotted Bladder Senna | Fabaceae |
| Colutea x media | Blasenstrauch Bastard | Bastard Bladder Senna | Fabaceae |
| Comarum palustre | Blutauge Sumpf | Purple Marshlocks | Rosaceae |
| Comastoma nanum | Haarschlund Zwerg | Dwarf Gentian | Gentianacea |
| Comastoma tenellum | Haarschlund Zarter | Slender Gentian | Gentianacea |
| Commelina benghalensis | Tagblume Bengalische | Bengal Dayflower | Commelinaceae |
| Commelina coelestis | Tagblume Himmelblaue | Blue Dayflower | Commelinaceae |
| Commelina communis | Tagblume Gewöhnliche | Asiatic Dayflower | Commelinaceae |
| Commelina dianthifolia | Tagblume Nelkenblättrige | Birdbill Dayflower | Commelinaceae |
| Commelina virginica | Tagblume Virginische | Virginia Dayflower | Commelinaceae |
| Commicarpus plumbagineus | Commicarpus Bleiwurzblättrige | Leadwort- leaved Commicarpus | Nyctaginaceae |
| Conium divaricatum | Schierling Spreizender | Spreading Hemlock | Apiaceae |
| Conium maculatum | Schierling Gefleckter | Poison Hemlock | Apiaceae |
| Consolida ajacis | Feldrittersporn Garten | Doubtful Knight's- Spur | Ranunculaceae |
| Consolida arenaria | Feldrittersporn Sand | Beach Knight's- Spur | Ranunculaceae |
| Consolida brevicornis | Feldrittersporn Kurzsporniger | Short- spurred Knight's- Spur | Ranunculaceae |
| Consolida hellespontica | Feldrittersporn Dardanellen | Hellespont Knight's- Spur | Ranunculaceae |
| Consolida orientalis | Feldrittersporn Orientalischer | Oriental Knight's- Spur | Ranunculaceae |
| Consolida phrygia | Feldrittersporn Phrygischer | Phrygian Knight's- Spur | Ranunculaceae |
| Consolida regalis | Feldrittersporn Gewöhnlicher | Royal Knight's- Spur | Ranunculaceae |
| Consolida samia | Feldrittersporn Samos | Samian Knight's- Spur | Ranunculaceae |
| Consolida tenuissima | Feldrittersporn Zarter | Long Knight's- Spur | Ranunculaceae |
| Consolida tuntasiana | Feldrittersporn Tuntas | Tuntas's Knight's- Spur | Ranunculaceae |
| Consolida uechtritziana | Feldrittersporn Uechtritzs | Uechtritz's Knight's- Spur | Ranunculaceae |
| Convallaria majalis | Maiglöckchen Echtes | Europeam Lily- of- the- valley | Convallariaceae |
| Convolvulus argyrothamnos | Winde Kreta | Cretan Bindweed | Convolvulaveae |
| Convolvulus althaeoides | Winde Eibischblättrige | Mallow Bindweed | Convolvulaveae |
| Convolvulus arvensis | Winde Acker | Field Bindweed | Convolvulaveae |
| Convolvulus betonicifolius | Winde Betonienblättrige | Shaggy Bindweed | Convolvulaveae |
| Convolvulus boissieri | Winde Boissiers | Boissier's Bindweed | Convolvulaveae |
| Convolvulus cantabrica | Winde Kantabrische | Southern Bindweed | Convolvulaveae |
| Convolvulus cneorum | Winde Silber | Shrubby Bindweed | Convolvulaveae |
| Convolvulus dorycnium | Winde Prächtige | Splendid Bindweed | Convolvulaveae |
| Convolvulus elegantissimus | Winde Elegante | Elegant Bindweed | Convolvulaveae |
| Convolvulus farinosus | Winde Bemehlte | Wild Bindweed | Convolvulaveae |
| Convolvulus fernandesii | Winde Fernandes | Fernandes Bindweed | Convolvulaveae |
| Convolvulus holosericeus | Winde Seidenhaarige | Silk- haired Bindweed | Convolvulaveae |
| Convolvulus humilis | Winde Niedrige | Dwarf Bindweed | Convolvulaveae |
| Convolvulus lanuginosus | Winde Wollige | Wooly Bindweed | Convolvulaveae |
| Convolvulus libanoticus | Winde Libanon | Libanon Bindweed | Convolvulaveae |
| Convolvulus lineatus | Winde Gestrichelte | Narrow- leaved Bindweed | Convolvulaveae |
| Convolvulus mairei | Winde Maires | Maire's Bindweed | Convolvulaveae |
| Convolvulus meonanthus | Winde Kleinblütige | Small- flowered Bindweed | Convolvulaveae |
| Convolvulus oleifolius | Winde Ölbaumblättrige | Pink Bindweed | Convolvulaveae |
| Convolvulus pentapetaloides | Winde Niedrige | Two- coloured Bindweed | Convolvulaveae |
| Convolvulus sabatius | Winde Kriechende | Blue Rock Bindweed | Convolvulaveae |
| Convolvulus scammonia | Winde Hellgelbe | Scammony | Convolvulaveae |
| Convolvulus siculus | Winde Sizilianische | Blue Bindweed | Convolvulaveae |
| Convolvulus tricolor | Winde Dreifarbige | Tricolour Convolvulus | Convolvulaveae |
| Convolvulus valentinus | Winde Valencia | Mallorcan Bindweed | Convolvulaveae |
| Conyza blakei | Katzenschweif Blakes | Blake's Fleabane | Asteraceae |
| Conyza bonariensis | Katzenschweif Krauser | Argentine Fleabane | Asteraceae |
| Conyza canadensis | Katzenschweif Kanadischer | Canadian Fleabane | Asteraceae |
| Conyza floribunda | Katzenschweif Vielblütiger | Many- flowered Fleabane | Asteraceae |
| Conyza sumatrensis | Katzenschweif Weißer | Sumatran Fleabane | Asteraceae |
| Corallorhiza trifida | Dreispaltige Korallenwurz | Northern Coralroot | Orchidaceae |
| Corchorus olitorius | Jute Langkapselige | Jew's Mallow | Malvaceae |
| Corema album | Krähenbeere Weiße | Portuguese Crowberry | Ericaceae |
| Coreopsis grandiflora | Mädchenauge Großblumiges | Largeflower Tickseed | Asteraceae |
| Coreopsis lanceolata | Mädchenauge Lanzettblättriges | Lanceleaf Tickseed | Asteraceae |
| Coreopsis tinctoria | Mädchenauge Färber | Golden Tickseed | Asteraceae |
| Coreopsis tripteris | Mädchenauge Hohes | Tall Tickseed | Asteraceae |
| Coreopsis verticillata | Mädchenauge Scheinquirl | Whorled Tickseed | Asteraceae |
| Coris hispanica | Stachelträubchen Spanisches | Spanish Coris | Primulaceae |
| Coris monspeliensis | Stachelträubchen Montpellier | Montpellier Coris | Primulaceae |
| Corispermum canescens | Wanzensame Grauer | Grey Bugseed | Chenopodiaceae |
| Corispermum filifolium | Wanzensame Schmalblättriger | Narrow- leaved Bugseed | Chenopodiaceae |
| Corispermum leptopterum | Wanzensame Schmalflügeliger | Sibirian Bugseed | Chenopodiaceae |
| Corispermum marschallii | Wanzensame Marschalls | Marschall's Bugseed | Chenopodiaceae |
| Corispermum nitidum | Wanzensame Glanz | Slender Bugseed | Chenopodiaceae |
| Coristospermum ferulaceae | Liebstock Piemonteser | Piedmont Lovage | Apiaceae |
| Coristospermum lucidum | Liebstock Glänzender | Shining Lovage | Apiaceae |
| Cornus alba | Hartriegel Tatarischer | Tartar Dogwood | Cornaceae |
| Cornus mas | Kornelkirsche | Cornelian Cherry | Cornaceae |
| Cornus sanguinea | Hartriegel Blutroter | Bloodtwig Dogwood | Cornaceae |
| Cornus sericea | Hartriegel Seidiger | Redosier Dogwood | Cornaceae |
| Coronilla coronata | Kronwicke Berg | Mountain Scorpion Vetch | Fabaceae |
| Coronilla juncea | Kronwicke Binsen | Rush Like Scorpion Vetch | Fabaceae |
| Coronilla minima | Kronwicke Kleine | Small Scorpion Vetch | Fabaceae |
| Coronilla montserratii | Kronwicke Montserrats | Montserrat's Scorpion Vetch | Fabaceae |
| Coronilla repanda | Kronwicke Gekrümmtfrüchtige | Wavy- leaved Scorpion Vetch | Fabaceae |
| Coronilla scorpioides | Kronwicke Skorpion | Annual Scorpion Vetch | Fabaceae |
| Coronilla talaverae | Kronwicke Talaveras | Talavera's Scorpion Vetch | Fabaceae |
| Coronilla vaginalis | Kronwicke Scheiden | Sheated Scorpion Vetch | Fabaceae |
| Coronilla valentina | Kronwicke Strauch | Shrubby Scorpion Vetch | Fabaceae |
| Cortusa matthioli | Heilglöckchen Alpen | Bear's-Ear Sanicle | Primulaceae |
| Corydalis blanda | Lerchensporn Angenehmer | Pleasant Corydalis | Papaveraceae |
| Corydalis capnoides | Lerchensporn Weißer | White Corydalis | Papaveraceae |
| Corydalis densiflora | Lerchensporn Dichtblütiger | Dense- flowered Corydalis | Papaveraceae |
| Corydalis cava | Lerchensporn Hohler | Hollowroot Corydalis | Papaveraceae |
| Corydalis integra | Lerchensporn Ganzrandiger | Entire Corydalis | Papaveraceae |
| Corydalis intermedia | Lerchensporn Mittlerer | Intermediate Corydalis | Papaveraceae |
| Corydalis pumila | Lerchensporn Zwerg | Dwarf Corydalis | Papaveraceae |
| Corydalis solida | Lerchensporn Gefingerter | Solid Corydalis | Papaveraceae |
| Corydalis solida ssp. incisa | Lerchensporn Eingeschnittener | Incised Corydalis | Papaveraceae |
| Corydalis thasia | Lerchensporn Thasos | Thasos Corydalis | Papaveraceae |
| Corydalis uniflora | Lerchensporn Einblütiger | One- flowered Corydalis | Papaveraceae |
| Corydalis wettsteinii | Lerchensporn Wettsteins | Wettstein's Corydalis | Papaveraceae |
| Corydalis zetterlundii | Lerchensporn Zetterlunds | Zetterlund's Corydalis | Papaveraceae |
| Corydalis x budensis | Lerchensporn Zetterlunds | Zetterlund's Corydalis | Papaveraceae |
| Corylus avellana | Hasel Gewöhnliche | Common Hazel | Betulaceae |
| Corylus colurna | Hasel Baum | Turkish Hazel | Betulaceae |
| Corylus maxima | Hasel Lamberts | Giant Hazel | Betulaceae |
| Cosentinia vellea | Pelzfarn Wolliger | Wooly Lip Fern | Pteridaceae |
| Cosmos bipinnatus | Schmuckkörbchen Fiederblättriges | Garden Cosmos | Asteraceae |
| Cosmos sulphureus | Schmuckkörbchen Schwefel | Sulphur Cosmos | Asteraceae |
| Cota altissima | Hundskamille Hohe | Erect Chamomille | Asteraceae |
| Cota amblyolepis | Hundskamille Stumpfschuppige | Blunt- scaled Chamomille | Asteraceae |
| Cota austriaca | Hundskamille Österreichische | Austrian Chamomille | Asteraceae |
| Cota brachmannii | Hundskamille Brachmanns | Brachmann's Chamomille | Asteraceae |
| Cota coleopoda | Hundskamille Hohlstängelige | Hollow- stalked Chamomille | Asteraceae |
| Cota oretana | Hundskamille Oretana | Oretana Chamomille | Asteraceae |
| Cota palaestina | Hundskamille Palestina | Palestinian Chamomille | Asteraceae |
| Cota segetalis | Hundskamille Saat | Grainfield Chamomille | Asteraceae |
| Cota tinctoria | Hundskamille Färber | Yellow Chamomille | Asteraceae |
| Cota tinctoria ssp parnassica | Hundskamille Parnassos | Mt. Parnassos Chamomille | Asteraceae |
| Cota triumfettii | Hundskamille Triumfettis | Trionfetti's Chamomille | Asteraceae |
| Cota wiedemanniana | Hundskamille Wiedemanns | Wiedemann's Chamomille | Asteraceae |
| Cotinus coggygria | Perückenstrauch Gewöhnlicher | European Smoketree | Anacardiaceae |
| Cotoneaster acuminatus | Zwergmispel Zugespitzte | Acuminate Cotoneaster | Rosaceae |
| Cotoneaster acutifolius | Zwergmispel Peking | Peking Cotoneaster | Rosaceae |
| Cotoneaster adpressus | Zwergmispel Spalier | Creeping Cotoneaster | Rosaceae |
| Cotoneaster affinis | Zwergmispel Stumpfblättrige | Purpleberry Cotoneaster | Rosaceae |
| Cotoneaster apiculatus | Zwergmispel Bespitzte | Cranberry Cotoneaster | Rosaceae |
| Cotoneaster bacillaris | Zwergmispel Rutenförmige | Rod- like Cotoneaster | Rosaceae |
| Cotoneaster bullatus | Zwergmispel Runzel | Hollyberry Cotoneaster | Rosaceae |
| Cotoneaster creticus | Zwergmispel Kretische | Cretan Cotoneaster | Rosaceae |
| Cotoneaster coriaceus | Zwergmispel Lederige | Milkflower Cotoneaster | Rosaceae |
| Cotoneaster cornifolius | Zwergmispel Hartriegelblättrige | Glossy Cotoneaster | Rosaceae |
| Cotoneaster dammeri | Zwergmispel Teppich | Dammer's Cotoneaster | Rosaceae |
| Cotoneaster delphinensis | Zwergmispel Dauphine | Dauphine Cotoneaster | Rosaceae |
| Cotoneaster dielsianus | Zwergmispel Diels | Diel's Cotoneaster | Rosaceae |
| Cotoneaster divaricatus | Zwergmispel Sparrige | Spreading Cotoneaster | Rosaceae |
| Cotoneaster favargeri | Zwergmispel Favargers | Favarger's Cotoneaster | Rosaceae |
| Cotoneaster franchetii | Zwergmispel Franchets | Orange Cotoneaster | Rosaceae |
| Cotoneaster frigidus | Zwergmispel Kälte | Tree Cotoneaster | Rosaceae |
| Cotoneaster granatensis | Zwergmispel Granadische | Granadian Cotoneaster | Rosaceae |
| Cotoneaster horizontalis | Zwergmispel Fächer | Wall Cotoneaster | Rosaceae |
| Cotoneaster integerrimus | Zwergmispel Gewöhnliche | Common Cotoneaster | Rosaceae |
| Cotoneaster integrifolius | Zwergmispel Ganzrandige | Entire- leaved Cotoneaster | Rosaceae |
| Cotoneaster intermedius | Zwergmispel Mittlere | Intermediate Cotoneaster | Rosaceae |
| Cotoneaster juranus | Zwergmispel Jura | Jurassic Cotoneaster | Rosaceae |
| Cotoneaster laxiflorus | Zwergmispel Schwarzfrüchtige | Black Cotoneaster | Rosaceae |
| Cotoneaster microphyllus | Zwergmispel Kleinblättrige | Littleleaf Cotoneaster | Rosaceae |
| Cotoneaster moupinensis | Zwergmispel Moupins | Moupin's Cotoneaster | Rosaceae |
| Cotoneaster multiflorus | Zwergmispel Vielblütige | Many- flowered Cotoneaster | Rosaceae |
| Cotoneaster nebrodensis | Zwergmispel Mt. Nebrodi | Sicilian Cotoneaster | Rosaceae |
| Cotoneaster nitens | Zwergmispel Glänzende | Few- flowered Cotoneaster | Rosaceae |
| Cotoneaster nummularius | Zwergmispel Münzblättrige | Coin- leaved Cotoneaster | Rosaceae |
| Cotoneaster obscurus | Zwergmispel Dunkle | Bloodberry Cotoneaster | Rosaceae |
| Cotoneaster obtusisepalus | Zwergmispel Stumpfkelchige | Blunt- sepaled Cotoneaster | Rosaceae |
| Cotoneaster parnassicus | Zwergmispel Parnassos | Mt. Parnassos Cotoneaster | Rosaceae |
| Cotoneaster praecox | Zwergmispel Nanshan | Nanshan Cotoneaster | Rosaceae |
| Cotoneaster raboutensis | Zwergmispel Rabou | Rabou Cotoneaster | Rosaceae |
| Cotoneaster racemiflorus | Zwergmispel Rispige | Racemose Cotoneaster | Rosaceae |
| Cotoneaster rhederi | Zwergmispel Rheders | Rheder's Cotoneaster | Rosaceae |
| Cotoneaster roseus | Zwergmispel Rosa | Pink Cotoneaster | Rosaceae |
| Cotoneaster salicifolius | Zwergmispel Weidenblättrige | Willow- leaved Cotoneaster | Rosaceae |
| Cotoneaster simonsii | Zwergmispel Steife | Himalayan Cotoneaster | Rosaceae |
| Cotoneaster tomentosus | Zwergmispel Filz | Hairy Cotoneaster | Rosaceae |
| Cotoneaster villosulus | Zwergmispel Feinzottige | Taiping Cotoneaster | Rosaceae |
| Cotoneaster zabelii | Zwergmispel Zabels | Zabel's Cotoneaster | Rosaceae |
| Cotoneaster x suecicus | Zwergmispel Schwedische | Swedish Cotoneaster | Rosaceae |
| Cotula australis | Laugenblume Australische | Australian Brassbuttons | Asteraceae |
| Cotula coronopifolia | Laugenblume Krähenfußblättrige | Common Brassbuttons | Asteraceae |
| Crassula alata | Dickblatt Geflügeltes | Three- parted Pygmyweed | Crassulaceae |
| Crassula aquatica | Dickblatt Wasser | Common Pygmyweed | Crassulaceae |
| Crassula basaltica | Dickblatt Basalt | Basalt Pygmyweed | Crassulaceae |
| Crassula campestris | Dickblatt Feld | Field Pygmyweed | Crassulaceae |
| Crassula helmsii | Dickblatt Helms | Helm's Pygmyweed | Crassulaceae |
| Crassula muscosa | Dickblatt Bärlappähnliches | Princess Pine | Crassulaceae |
| Crassula ovata | Geldbaum | Jade Plant | Crassulaceae |
| Crassula tillaea | Dickblatt Moos | Moss Pygmyweed | Crassulaceae |
| Crassula vaillantii | Dickblatt Vaillants | Vaillant's Pygmyweed | Crassulaceae |
| Crataegus azarolus | Weißdorn Azarol | Cretan Hawthorn | Rosaceae |
| Crataegus coccinea | Weißdorn Scharlach | Scarlet Hawthorn | Rosaceae |
| Crataegus crus- galli | Weißdorn Hahnensporn | Cockspur Hawthorn | Rosaceae |
| Crataegus granatensis | Weißdorn Granada | Granada Hawthorn | Rosaceae |
| Crataegus heldreichii | Weißdorn Heldreichs | Heldreich's Hawthorn | Rosaceae |
| Crataegus laciniata | Weißdorn Eingeschnittener | Cut- leaved Hawthorn | Rosaceae |
| Crataegus laevigata | Weißdorn Zweigriffliger | Woodland Hawthorn | Rosaceae |
| Crataegus laevigata 'Paul's Scarlett' | Rotdorn | Red Hawthorn | Rosaceae |
| Crataegus mollis | Weißdorn Weichhaariger | Downy Hawthorn | Rosaceae |
| Crataegus monogyna | Weißdorn Eingriffeliger | Oneseed Hawthorn | Rosaceae |
| Crataegus nigra | Weißdorn Schwarzer | Hungarian Hawthorn | Rosaceae |
| Crataegus orientalis | Weißdorn Östlicher | Oriental Hawthorn | Rosaceae |
| Crataegus pentagyna | Weißdorn Fünfgriffeliger | FivestyledHawthorn | Rosaceae |
| Crataegus pycnoloba | Weißdorn Kleinlappiger | Small- lobed Hawthorn | Rosaceae |
| Crataegus rhipidophylla | Weißdorn Großkelch | Midland Hawthorn | Rosaceae |
| Crataegus submollis | Weißdorn Quebec | Quebec Hawthorn | Rosaceae |
| Crataegus x lavallei | Weißdorn Lederblättriger | Lavallée's Hawthorn | Rosaceae |
| Crataegus x macrocarpa | Weißdorn Großfrüchtiger | Large- fruited Hawthorn | Rosaceae |
| Crataegus x media | Weißdorn Mittlerer | Hybrid Hawthorn | Rosaceae |
| Crataegus x subsphaerica | Weißdorn Verschiedenzähniger | Different- toothed Hawthorn | Rosaceae |
| Crepis albida | Pippau Weißlicher | Whitish Hawk's Beard | Asteracea |
| Crepis alpestris | Pippau Voralpen | Golden Hawk's Beard | Asteracea |
| Crepis alpina | Pippau Alpen | Alpine Hawk's Beard | Asteracea |
| Crepis arcuata | Pippau Gebogener | Curved Hawk's Beard | Asteracea |
| Crepis aspromontana | Pippau Aspromonte | Aspromonte Hawk's Beard | Asteracea |
| Crepis athoa | Pippau Athos | Athos Hawk's Beard | Asteracea |
| Crepis aurea ssp. aurea | Pippau Gold Gewöhnlicher | Common Golden Hawk's Beard | Asteracea |
| Crepis aurea ssp. glabrescens | Pippau Gold Verkahlender | Glabrescent Golden Hawk's Beard | Asteracea |
| Crepis auriculifolia | Pippau Aurikelblättriger | Bear's Ear Hawk's Beard | Asteracea |
| Crepis baldaccii ssp carpini | Pippau Hainbuchen | Hornbeam Hawk's Beard | Asteracea |
| Crepis bellidifolia | Pippau Gänseblümchenblättriger | Daisy- leaved Hawk's Beard | Asteracea |
| Crepis bermejana | Pippau Sierra Bermeja | Sierra Bermeja Hawk's Beard | Asteracea |
| Crepis bertiscea | Pippau Mount Prokletije | Mount Prokletije Hawk's Beard | Asteracea |
| Crepis biennis | Pippau Wiesen | Rough Hawk's Beard | Asteracea |
| Crepis bursifolia | Pippau Hirtschentäschelblättriges | Italian Hawk's Beard | Asteracea |
| Crepis capillaris | Pippau Kleinköpfiger | Smooth Hawk's Beard | Asteracea |
| Crepis chondrilloides | Pippau Knorpellattichähnlicher | Chondrilla- like Hawk's Beard | Asteracea |
| Crepis commutata | Pippau Vertauschter | Confused Hawk's Beard | Asteracea |
| Crepis conyzifolia | Pippau Großköpfiger | Conyza- leaved Hawk's Beard | Asteracea |
| Crepis cretica | Pippau Kretischer | Cretan Hawk's Beard | Asteracea |
| Crepis dioscoridis | Pippau Dioscurides' | Dioscurides's Hawk's Beard | Asteracea |
| Crepis erythia | Pippau Cadiz | Cadiz Hawk's Beard | Asteracea |
| Crepis foetida | Pippau Stinkender | Stinking Hawk's Beard | Asteracea |
| Crepis fraasii | Pippau Fraas' | Fraas's Hawk's Beard | Asteracea |
| Crepis froelichiana ssp. dinarica | Pippau Slowenischer | Slovenian Hawk's Beard | Asteracea |
| Crepis froelichiana ssp. froelichiana | Pippau Frölichs | Froelich's Hawk's Beard | Asteracea |
| Crepis granatensis | Pippau Granada | Granada Hawk's Beard | Asteracea |
| Crepis heldreichiana | Pippau Heldreichs | Heldreich's Hawk's Beard | Asteracea |
| Crepis incana | Pippau Grauer | Grey Hawk's Beard | Asteracea |
| Crepis jaquinii | Pippau Felsen | Jaquin's Hawk's Beard | Asteracea |
| Crepis lacera | Pippau Zerfledderter | Lacerate Hawk's Beard | Asteracea |
| Crepis lampsanoides | Pippau Rainkohlähnlicher | Lapsana- like Hawk's Beard | Asteracea |
| Crepis leontodontoides | Pippau Löwenzahnähnlicher | Leontodon- like Hawk's Beard | Asteracea |
| Crepis magellensis | Pippau Majella | Majella Hawk's Beard | Asteracea |
| Crepis micrantha | Pippau Kleinblütiger | Small- flowered Hawk's Beard | Asteracea |
| Crepis mollis | Pippau Weicher | Northern Hawk's Beard | Asteracea |
| Crepis multiflora | Pippau Vielblütiger | Many- flowered Hawk's Beard | Asteracea |
| Crepis neglecta | Pippau Übersehener | Neglected Hawk's Beard | Asteracea |
| Crepis nicaeensis | Pippau Nizza | French Hawk's Beard | Asteracea |
| Crepis novoana | Pippau Novos | Novo's Hawk's Beard | Asteracea |
| Crepis oporinoides | Pippau Herbst | Autumn Hawk's Beard | Asteracea |
| Crepis paludosa | Pippau Sumpf | Marsh Hawk's Beard | Asteracea |
| Crepis pannonica | Pippau Pannonischer | Pannonian Hawk's Beard | Asteracea |
| Crepis pontana | Pippau Berg | Mountain Hawk's Beard | Asteracea |
| Crepis praemorsa | Pippau Abgebissener | Leafless Hawk's Beard | Asteracea |
| Crepis pulchra | Pippau Schöner | Small- flowered Hawk's Beard | Asteracea |
| Crepis pusilla | Pippau Stängelloser | Lesser Hawk's Beard | Asteracea |
| Crepis pygmaea | Pippau Zwerg | Dwarf Hawk's Beard | Asteracea |
| Crepis pyrenaica | Pippau Schabenkraut | Pyrenean Hawk's Beard | Asteracea |
| Crepis reuterana | Pippau Reuters | Reuter's Hawk's Beard | Asteracea |
| Crepis rhaetica | Pippau Rätischer | Rhaetian Hawk's Beard | Asteracea |
| Crepis rubra | Pippau Roter | Red Hawk's Beard | Asteracea |
| Crepis salzmannii | Pippau Salzmanns | Salzmann's Hawk's Beard | Asteracea |
| Crepis sancta | Pippau Heiliger | Holy Hawk's Beard | Asteracea |
| Crepis setosa | Pippau Borsten | Bristly Hawk's Beard | Asteracea |
| Crepis sibthorpiana | Pippau Sibthorps | Sibthorp's Hawk's Beard | Asteracea |
| Crepis sprengelii | Pippau Sprengels | Sprengel's Hawk's Beard | Asteracea |
| Crepis suffreniana | Pippau Suffrens | Suffren's Hawk's Beard | Asteracea |
| Crepis tectorum | Pippau Dach | Narrow- leaved Hawk's Beard | Asteracea |
| Crepis terglouensis | Pippau Triglav | Triglav Hawk's Beard | Asteracea |
| Crepis tingitana | Pippau Tanger | Tangier Hawk's Beard | Asteracea |
| Crepis triasii | Pippau Klippen | Crag Hawk's Beard | Asteracea |
| Crepis turcica | Pippau Türkischer | Turkish Hawk's Beard | Asteracea |
| Crepis tybakiensis | Pippau Tymbaki | Tymbaki Hawk's Beard | Asteracea |
| Crepis vesicaria ssp bivoniana | Pippau Bivona | Bivona Hawk's Beard | Asteracea |
| Crepis vesicaria ssp. taraxacifolia | Pippau Löwenzahn | Dandelion- leaved Hawk's Beard | Asteracea |
| Crepis vesicaria ssp. vesicaria | Pippau Blasen Gewöhnlicher | Beaked Hawk's Beard | Asteracea |
| Crepis viscidula ssp. geracioides | Pippau Geraciumähnlicher | Geracium- like Hawk's Beard | Asteracea |
| Crepis viscidula ssp. viscidula | Pippau Klebriger | Viscid Hawk's Beard | Asteracea |
| Crepis zacintha | Pippau Zakynthos | Zakynthos Hawk's Beard | Asteracea |
| Cressa cretica | Cressa Kretische | Cretan Alkaliweed | Convolvulaeae |
| Crucianella angustifolia | Kreuzblatt Schmalblättriges | Narrowleaf Crucianella | Rubiaceae |
| Crucianella bithynica | Kreuzblatt Bythynisches | Bythynian Crucianella | Rubiaceae |
| Crucianella graeca | Kreuzblatt Griechisches | Greek Crucianella | Rubiaceae |
| Crucianella imbricata | Kreuzblatt Dachziegel | Shingle Crucianella | Rubiaceae |
| Crucianella latifolia | Kreuzblatt Breitblättriges | Broadleaf Crucianella | Rubiaceae |
| Crucianella macrostachya | Kreuzblatt Hohes | Large Crucianella | Rubiaceae |
| Crucianella maritima | Kreuzblatt Strand | Sea Crucianella | Rubiaceae |
| Crucianella patula | Kreuzblatt Abstehendes | Spreading Crucianella | Rubiaceae |
| Cruciata glabra | Kreuzlabkraut Kahles | Slender Crosswort | Rubiaceae |
| Cruciata laevipes | Kreuzlabkraut Gewimpertes | Smooth Bedstraw | Rubiaceae |
| Cruciata pedemontana | Kreuzlabkraut Piemonteser | Piedmont Bedstraw | Rubiaceae |
| Cruciata taurica | Kreuzlabkraut Taurisches | Taurian Crosswort | Rubiaceae |
| Crupina crupinastrum | Schlupfsame Echter | Southern Crupina | Asteraceae |
| Crupina intermedia | Schlupfsame Mittlerer | Intermediate Crupina | Asteraceae |
| Crupina vulgaris | Schlupfsame Gewöhnlicher | Common Crupina | Asteraceae |
| Cryptogramma crispa | Rollfarn Krauser | Parsley Fern | Pteridaceae |
| Cryptotaenia canadensis | Cryptotaenie Kanadische | Canadian Honewort | Apiaceae |
| Cryptotaenia thomasii | Cryptotaenie Thomas' | Thomas's Honewort | Apiaceae |
| Cucumis melo | Zuckermelone | Musk Melon | Cucurbitaceae |
| Cucumis myriocarpus | Gurke Stachelbeer | Gooseberry Cucumber | Cucurbitaceae |
| Cucumis sativus | Gurke Garten | Garden Cucumber | Cucurbitaceae |
| Cucurbita ficifolia | Kürbis Feigenblättriger | Figleaf Gourd | Cucurbitaceae |
| Cucurbita maxima | Kürbis Riesen | Giant Pumpkin | Cucurbitaceae |
| Cucurbita moschata | Kürbis Moschus | Crookneck Squash | Cucurbitaceae |
| Cucurbita pepo | Kürbis Garten | Field Pumpkin | Cucurbitaceae |
| Culcita macrocarpa | Kissenfarn Großfrüchtiger | Wooly Tree Fern | Culcitaceae |
| Cullen americanum | Cullen Amerikanischer | American Scurfpea | Fabaceae |
| Cuscuta approximata | Seide Goldgelbe | Alfalfa Dodder | Convolvulaveae |
| Cuscuta atrans | Seide Schwarzwerdende | Black Dodder | Convolvulaveae |
| Cuscuta brevistyla | Seide Kurzgriffelige | Short- styled Dodder | Convolvulaveae |
| Cuscuta campestris | Seide Nordamerikanische | Fiveangled Dodder | Convolvulaveae |
| Cuscuta epilinum | Seide Flachs | Flax Dodder | Convolvulaveae |
| Cuscuta epithymum | Seide Quendel | Clover Dodder | Convolvulaveae |
| Cuscuta europaea | Seide Europäische | Greater Dodder | Convolvulaveae |
| Cuscuta gronovii | Seide Gronovius | Swamp Dodder | Convolvulaveae |
| Cuscuta lupuliformis | Seide Pappel | Willow Dodder | Convolvulaveae |
| Cuscuta monogyna | Seide Eingrifflige | Eastern Dodder | Convolvulaveae |
| Cuscuta nivea | Seide Schneeweiße | Snow- white Dodder | Convolvulaveae |
| Cuscuta palaestina | Seide Palästina | Eastern Mediterranean Dodder | Convolvulaveae |
| Cuscuta planiflora | Seide Flachblütige | Smallseed Dodder | Convolvulaveae |
| Cuscuta scandens | Seide Südliche | Southern Dodder | Convolvulaveae |
| Cuscuta suaveolens | Seide Chilenische | Fringed Dodder | Convolvulaveae |
| Cuscuta triumvirati | Seide Triumvirat | - | Convolvulaveae |
| Cyanus depressus | Blauflockenblume Niedere | Low Cornflower | Asteraceae |
| Cyanus graminifolius | Blauflockenblume Grasblättrige | Grass- leaved Knapweed | Asteraceae |
| Cyanus montanus | Blauflockenblume Berg | Mountain Knapweed | Asteraceae |
| Cyanus pichleri | Blauflockenblume Pichlers | Pichler's Knapweed | Asteraceae |
| Cyanus pinardii | Blauflockenblume Pinards | Pinard's Knapweed | Asteraceae |
| Cyanus segetum | Kornblume | Cornflower | Asteraceae |
| Cyanus triumfettii | Blauflockenblume Filz | Trionfetti's Knapweed | Asteraceae |
| Cyanus tuberosus | Blauflockenblume Knollige | Tuberous Knapweed | Asteraceae |
| Cyanus velenovskyi | Blauflockenblume Velenovskys | Velenovsky's Knapweed | Asteraceae |
| Cyanus vorasanus | Blauflockenblume Mt. Voras | Mt. Voras Knapweed | Asteraceae |
| Cyatophylla chlorifolia | Seifenkraut Blassgrünes | Pale- green Soapwort | Caryophyllaceae |
| Cyclamen balearicum | Alpenveilchen Balearisches | Balearic Cyclamen | Primulaceae |
| Cyclamen coum | Alpenveilchen Freiland | Eastern Cyclamen | Primulaceae |
| Cyclamen creticum | Alpenveilchen Kreta | Cretan Cyclamen | Primulaceae |
| Cyclamen cyprium | Alpenveilchen Zyprisches | Zypriot Cyclamen | Primulaceae |
| Cyclamen graecum | Alpenveilchen Griechisches | Greek Cyclamen | Primulaceae |
| Cyclamen hederifolium | Alpenveilchen Neapolitanisches | Balearic Cyclamen | Primulaceae |
| Cyclamen peloponnesiacum | Alpenveilchen Peloponnes | Peloponnesian Cyclamen | Primulaceae |
| Cyclamen persicum | Alpenveilchen Zimmer | Florist's Cyclamen | Primulaceae |
| Cyclamen purpurascens | Alpenveilchen Gewöhnliches | European Cyclamen | Primulaceae |
| Cyclamen repandum | Alpenveilchen Efeublättriges | Spring Cyclamen | Primulaceae |
| Cyclamen rhodium | Alpenveilchen Rhodos | Rhodian Cyclamen | Primulaceae |
| Cycloloma atriplicifolium | Flügelgänsefuß Meldenblättriger | Winged Pigweed | Chenopodiaceae |
| Cydonia olonga | Quitte Echte | Common Quince | Rosaceae |
| Cymbalaria acutiloba ssp. dodekanesii | Zimbelkraut Dodekanes | Dodekanes Toadflax | Plantaginaceae |
| Cymbalaria aequitriloba | Zimbelkraut Dreilappiges | Three-lobed Toadflax | Plantaginaceae |
| Cymbalaria ebelii | Zimbelkraut Ebels | Ebel's Toadflax | Plantaginaceae |
| Cymbalaria fragilis | Zimbelkraut Zerbrechliches | Fragile Toadflax | Plantaginaceae |
| Cymbalaria glutinosa | Zimbelkraut Klebriges | Thyrrenean Toadflax | Plantaginaceae |
| Cymbalaria hepaticifolia | Zimbelkraut Leberblümchenblättriges | Corsican Toadflax | Plantaginaceae |
| Cymbalaria longipes | Zimbelkraut Langstieliges | Long-stemmed Toadflax | Plantaginaceae |
| Cymbalaria microcalyx ssp. heterosepala | Zimbelkraut Verschiedenkelchiges | Varying- sepaled Toadflax | Plantaginaceae |
| Cymbalaria microcalyx ssp. microcalyx | Zimbelkraut Kleinkelchiges | Small- sepaled Toadflax | Plantaginaceae |
| Cymbalaria minor | Zimbelkraut Kleines | Small Toadflax | Plantaginaceae |
| Cymbalaria muelleri | Zimbelkraut Müllers | Mueller's Toadflax | Plantaginaceae |
| Cymbalaria muralis ssp. muralis | Zimbelkraut Mauer | Ivy-Leaved Toadflax | Plantaginaceae |
| Cymbalaria muralis ssp visianii | Zimbelkraut Visianis | Visiani's Toadflax | Plantaginaceae |
| Cymbalaria pallida | Zimbelkraut Bleiches | Italian Toadflax | Plantaginaceae |
| Cymbalaria paradoxa | Zimbelkraut Sonderbares | Paradox Toadflax | Plantaginaceae |
| Cymbalaria pubescens | Zimbelkraut Haariges | Sicilian Toadflax | Plantaginaceae |
| Cymbalaria spetae | Zimbelkraut Spetas | Speta's Toadflax | Plantaginaceae |
| Cynanchum acutum | Lianen- Schwalbenwurz | Stranglevine | Apocynaceae |
| Cynara algarbiensis | Artischocke Algarve | Algarve Artichoke | Asteraceae |
| Cynara baetica | Artischocke Andalusische | Andalusian Artichoke | Asteraceae |
| Cynara cardunculus | Artischocke Wilde | Cardoon | Asteraceae |
| Cynara cornigera | Artischocke Gehörnte | Horned Artichoke | Asteraceae |
| Cynara cyrenaica | Artischocke Libysche | Lybian Artichoke | Asteraceae |
| Cynara humilis | Artischocke Niedrige | Dwarf Artichoke | Asteraceae |
| Cynara scolymus | Artischocke Gemüse | Globe Artichoke | Asteraceae |
| Cynara tournefortii | Artischocke Tourneforts | Tournefort's Artichoke | Asteraceae |
| Cynoglossum amabile | Vergissmeinnicht Chinesisches | Chinese Forget-me- not | Boraginaceae |
| Cynoglossum barbaricinum | Hundszunge Sardische | Sardinian Hound's Tongue | Boraginaceae |
| Cynoglossum cheirifolium | Hundszunge Goldlackblättrige | Wallflower- leaved Hound's tongue | Boraginaceae |
| Cynoglossum clandestinum | Hundszunge Verborgene | Hidden Hound's Tongue | Boraginaceae |
| Cynoglossum columnae | Hundszunge Colonna | Colonna Hound's Tongue | Boraginaceae |
| Cynoglossum creticum | Hundszunge Kretische | Cretan Hound's Tongue | Boraginaceae |
| Cynoglossum dioscoridis | Hundszunge Französische | Frech Hound's Tongue | Boraginaceae |
| Cynoglossum germanicum | Hundszunge Deutsche | Green Hound's-Tongue | Boraginaceae |
| Cynoglossum hungaricum | Hundszunge Ungarische | Hungarian Hound's Tongue | Boraginaceae |
| Cynoglossum melananthum | Hundszunge Schwarzblütige | Baetian Hound's Tongue | Boraginaceae |
| Cynoglossum magellense | Hundszunge Majella | Majella Hound's-Tongue | Boraginaceae |
| Cynoglossum nebrodense ssp. lucanum | Hundszunge Lukanische | Lucanian Hound's Tongue | Boraginaceae |
| Cynoglossum nebrodense ssp. nebrodensa | Hundszunge Sizilianische | Sicilian Hound's Tongue | Boraginaceae |
| Cynoglossum officinale | Hundszunge Gewöhnlich | Common Hound's Tongue | Boraginaceae |
| Cynoglossum pustulatum | Hundszunge Bläschen | Pustulate Hound's-Tongue | Boraginaceae |
| Cynoglossum sphacioticum | Hundszunge Sfakia | Sfakia Hound's Tongue | Boraginaceae |
| Cynoglottis barrelieri | Ochsenzunge Barreliers | Barrelier's Bugloss | Boraginaceae |
| Cynosurus cristatus | Kammgras Wiesen | Crested Dogstail Grass | Poaceae |
| Cynosurus echinatus | Kammgras Igel | Bristly Dogstail Grass | Poaceae |
| Cynosurus effusus | Kammgras Schönes | Elegant Dogstail Grass | Poaceae |
| Cyperus capitatus | Zypergras Dünen | Capitate Galingale | Cyperaceae |
| Cyperus difformis | Zypergras Missgestaltetes | Variable Flatsedge | Cyperaceae |
| Cyperus distachyos | Zypergras Zweiähriges | Two- spiked Flatsedge | Cyperaceae |
| Cyperus eragrostis | Zypergras Frischgrünes | Tall Flatsedge | Cyperaceae |
| Cyperus esculentus | Zypergras Erdmandel | Yellow Nutsedge | Cyperaceae |
| Cyperus flavescens | Zypergras Gelbliches | Yellow Flatsedge | Cyperaceae |
| Cyperus fuscus | Zypergras Braunes | Brown Flatsedge | Cyperaceae |
| Cyperus glomeratus | Zypergras Knäuel | Clustered Flatsedge | Cyperaceae |
| Cyperus integrifolius | Zypergras Wechselblättriges | Umbrella Papyrus | Cyperaceae |
| Cyperus laevigatus | Zypergras Glattes | Smooth Flatsedge | Cyperaceae |
| Cyperus longus | Zypergras Langes | Sweet Galingale | Cyperaceae |
| Cyperus michelianus | Zypergras Zwerg | Micheli's Galingale | Cyperaceae |
| Cyperus pannonicus | Zypergras Pannonisches | Pannonian Flatsedge | Cyperaceae |
| Cyperus papyrus | Papyrus Echter | Papyrus | Cyperaceae |
| Cyperus rotundus | Zypergras Knolliges | Nut Grass | Cyperaceae |
| Cyperus schweinitzii | Zypergras Schweinitzs | Schweinitz's Flatsedge | Cyperaceae |
| Cyperus serotinus | Zypergras Spätblühendes | Tidalmarsh Flatsedge | Cyperaceae |
| Cyrtomium falcatum | Sichelfarn Bogen | Japanese Hollyfern | Dryopteridaceae |
| Cyrtomium fortunei | Sichelfarn Ostasiatischer | Asian Netvein Hollyfern | Dryopteridaceae |
| Cystopteris alpina | Blasenfarn Alpen | Alpine Bladder Fern | Woodsiaceae |
| Cystopteris dickieana | Blasenfarn Runzelsporiger | Dickie's Bladder Fern | Woodsiaceae |
| Cystopteris fragilis | Blasenfarn Zerbrechlicher | Brittle Bladder Fern | Woodsiaceae |
| Cystopteris montana | Blasenfarn Berg | Mountain Bladder Fern | Woodsiaceae |
| Cystopteris sudetica | Blasenfarn Sudeten | Sudetic Bladder Fern | Woodsiaceae |
| Cystopteris viridula | Blasenfarn Grünlicher | Green Bladder Fern | Woodsiaceae |
| Cytisophyllum sessilifolium | Scheingeißklee Kahler | Sessile-leaved Tick Trefoil | Fabaceae |
| Cytisus aeolicus | Geißklee Äolischer | Aeolian Broom | Fabaceae |
| Cytisus agnipilus | Geißklee Lammwolliger | Lammwool- hairy Broom | Fabaceae |
| Cytisus albus | Zwergginster Weißer | White Broom | Fabaceae |
| Cytisus arboreus | Geißklee Baum | Tree Broom | Fabaceae |
| Cytisus ardoinoi | Geißklee Ardoinos | Ardoino's Broom | Fabaceae |
| Cytisus austriacus | Geißklee Österreichischer | Austrian Broom | Fabaceae |
| Cytisus cantabricus | Geißklee Kantabrischer | Cantabrian Broom | Fabaceae |
| Cytisus commutatus | Geißklee Veränderlicher | Variable Broom | Fabaceae |
| Cytisus creticus | Zwergginster Kretischer | Cretan Broom | Fabaceae |
| Cytisus decumbens | Geißklee Niederliegender | Prostrate Broom | Fabaceae |
| Cytisus diekii | Geißklee Diecks | Dieck's Broom | Fabaceae |
| Cytisus elongatus | Geißklee Verlängerter | Elongated Broom | Fabaceae |
| Cytisus emeriflorus | Geißklee Bergamasker | Lugano Broom | Fabaceae |
| Cytisus eriocarpus | Geißklee Wollfrüchtiger | Wool- fruited Broom | Fabaceae |
| Cytisus fontanesii | Geißklee Desfontaines | Desfontaine's Broom | Fabaceae |
| Cytidus galianoi | Geißklee Galianos | Galiano's Broom | Fabaceae |
| Cytisus grandiflorus | Geißklee Großblütiger | Large- flowered Broom | Fabaceae |
| Cytisus hirsutus | Geißklee Rauhaariger | Hairy Broom | Fabaceae |
| Cytisus lotoides | Geißklee Französischer | Lotus- like Broom | Fabaceae |
| Cytisus malacitanus | Geißklee Malaga | Malaga Broom | Fabaceae |
| Cytisus multiflorus | Geißklee Vielblütiger | Spanish Broom | Fabaceae |
| Cytisus nigicans | Geißklee Schwarzwerdender | Black Broom | Fabaceae |
| Cytisus oromediterraneus | Geißklee Pyrenäen | Pyrenean Broom | Fabaceae |
| Cytidus polytrichus | Geißklee Vielhaariger | Hispid Broom | Fabaceae |
| Cytisus procumbens | Geißklee Zwerg | Procumbent Broom | Fabaceae |
| Cytisus pseudoprocumbens | Geißklee Falscher Zwerg | False Procumbent Broom | Fabaceae |
| Cytisus purpureus | Zwergginster Purpur | Purple Broom | Fabaceae |
| Cytisus ratisbonensis | Geißklee Regensburger | Regensburgian Broom | Fabaceae |
| Cytisus rectipilosus | Geißklee Aufrechthaariger | Straight- hair Broom | Fabaceae |
| Cytisus scoparius | Besenginster | Scotch Broom | Fabaceae |
| Cytisus spinescens | Zwergginster Dorniger | Spiny Broom | Fabaceae |
| Cytisus striatus | Geißklee Gestreifter | Striated Broom | Fabaceae |
| Cytisus supinus | Geißklee Kopf | Clustered Broom | Fabaceae |
| Cytisus triflorus | Geißklee Rauhaariger | Hairy Broom | Fabaceae |
| Cytisus villosus | Geißklee Zottiger | Villous Broom | Fabaceae |
| Cytisus x praecox | Elfenbeinginster | Warminster Broom | Fabaceae |