Q - Rt
| Quercus aucheri | Eiche Auchers | Auchers's Oak | Fagaceae |
| Quercus canariensis | Eiche Algerische | Algerian Oak | Fagaceae |
| Quercus cerris | Eiche Zerr | Turkey Oak | Fagaceae |
| Quercus coccifera | Eiche Kermes | Kermes Oak | Fagaceae |
| Quercus congesta | Eiche Gedrängte | Crowded Oak | Fagaceae |
| Quercus dalechampii | Eiche Dalechamps | Dalechamp's Oak | Fagaceae |
| Quercus euboica | Eiche Euböa | Evvoia Oak | Fagaceae |
| Quercus faginea | Eiche Zenn | Valencian Oak | Fagaceae |
| Quercus frainetto | Eiche Ungarische | Italian Oak | Fagaceae |
| Quercus ilex | Eiche Stein | Evergreen Oak | Fagaceae |
| Quercus infectoria | Eiche Färber | Dyer's Oak | Fagaceae |
| Quercus ithaburnensis | Eiche Tabor | Tabor Oak | Fagaceae |
| Quercus lusitanica | Eiche Portugiesische | Portuguese Oak | Fagaceae |
| Quercus palustris | Eiche Sumpf | Swamp Oak | Fagaceae |
| Quercus petrae | Eiche Trauben | Sessile Oak | Fagaceae |
| Quercus polycarpa | Eiche Siebenbürger | Dschoroch's Oak | Fagaceae |
| Quercus pubescens | Eiche Flaum | White Oak | Fagaceae |
| Quercus pyrenaica | Eiche Pyrenäen | Pyrenean Oak | Fagaceae |
| Quercus robur | Eiche Stiel | English Oak | Fagaceae |
| Quercus rubra | Eiche Rot | Northern Red Oak | Fagaceae |
| Quercus suber | Eiche Kork | Cork Oak | Fagaceae |
| Quercus trojana | Eiche Mazedonische | Macedonian Oak | Fagaceae |
| Radiola linoides | Lein Zwerg | Beach flax | Linaceae |
| Ramonda myconi | Felsenteller Pyrenäen | Pyrenean Ramonda | Gesneriaceae |
| Ramonda nathaliae | Felsenteller Nathalias | Nathalia's Ramonda | Gesneriaceae |
| Ramonda serbica | Felsenteller Serbischer | Serbian Ramonda | Gesneriaceae |
| Ranunculus abnormis | Hahnenfuß Ungewöhnlicher | Abnormal Buttercup | Ranunculaceae |
| Ranunculus acetosellifolius | Hahnenfuß Sauerampferblättriger | Sheep- Sorrel- leaved Buttercup | Ranunculaceae |
| Ranunculus aconitifolius | Hahnenfuß Eisenhutblättriger | Aconite- leaved Buttercup | Ranunculaceae |
| Ranunculus acris | Hahnenfuß Scharfer | Showy Buttercup | Ranunculaceae |
| Ranunculus aduncus | Hahnenfuß Haken | Hooked Buttercup | Ranunculaceae |
| Ranunculus alpestris | Hahnenfuß Alpen | Alpine Buttercup | Ranunculaceae |
| Ranunculus amplexicaulis | Hahnenfuß Stängelumfassender | Amplexicaul Buttercup | Ranunculaceae |
| Ranunculus angustifolius | Hahnenfuß Schmalblättriger | Narrow- leaved Buttercup | Ranunculaceae |
| Ranunculus aquatilis | Wasserhahnenfuß Gewöhnlicher | Common Water- Crowfoot | Ranunculaceae |
| Ranunculus arvensis | Hahnenfuß Acker | Corn Buttercup | Ranunculaceae |
| Ranunculus asiaticus | Hahnenfuß Asiatischer | Asiatic Buttercup | Ranunculaceae |
| Ranunculus auricomus agg. | Hahnenfuß Gold | Goldilocks Buttercup | Ranunculaceae |
| Ranunculus barceloi | Hahnenfuß Barcelos | Barcelo's Buttercup | Ranunculaceae |
| Ranunculus batrachioides | Hahnenfuß Batrachiumähnlicher | Batrachium- like Buttercup | Ranunculaceae |
| Ranunculus baudotii | Wasserhahnenfuß Baudots | Brackish Water- Crowfoot | Ranunculaceae |
| Ranunculus bertisceus | Hahnenfuß Mons Bertiscus | Mons Bertiscus Buttercup | Ranunculaceae |
| Ranunculus bilobus | Hahnenfuß Zweilappiger | Bilobed Buttercup | Ranunculaceae |
| Ranunculus brevifolius | Hahnenfuß Kurzblättriger | Short- leaved Buttercup | Ranunculaceae |
| Ranunculus breyninus | Hahnenfuß Gebirgs | Breyne's Buttercup | Ranunculaceae |
| Ranunculus brutius | Hahnenfuß Kalabrischer | Calabrian Buttercup | Ranunculaceae |
| Ranunculus bulbosus | Hahnenfuß Knollen | Bulbous Buttercup | Ranunculaceae |
| Ranunculus bullatus | Hahnenfuß Herbst | Autumn Buttercup | Ranunculaceae |
| Ranunculus bupleuroides | Hahnenfuß Hasenohrähnlicher | Hare's Ear Buttercup | Ranunculaceae |
| Ranunculus cacuminis | Hahnenfuß Gipfel | Peak Buttercup | Ranunculaceae |
| Ranunculus carinthiacus | Hahnenfuß Kärntner | Carinthian Buttercup | Ranunculaceae |
| Ranunculus chius | Hahnenfuß Chios | Chios Buttercup | Ranunculaceae |
| Ranunculus circinatus | Wasserhahnenfuß Spreizender | Fan- leaved Water- Crowfoot | Ranunculaceae |
| Ranunculus clethraphilus | Hahnenfuß Erlenliebender | Corsican Buttercup | Ranunculaceae |
| Ranunculus confervoides | Wasserhahnenfuß Wurzelnder | Rooting Water- Crowfoot | Ranunculaceae |
| Ranunculus constantinopolitanus | Hahnenfuß Konstantinopler | Constantine Buttercup | Ranunculaceae |
| Ranunculus cordiger | Hahnenfuß Herz | Heart Buttercup | Ranunculaceae |
| Ranunculus crenatus | Hahnenfuß Gekerbter | Crenate Buttercup | Ranunculaceae |
| Ranunculus creticus | Hahnenfuß Kretischer | Cretan Buttercup | Ranunculaceae |
| Ranunculus cupreus | Hahnenfuß Kupfer | Copper Buttercup | Ranunculaceae |
| Ranunculus cymbalarifolius | Hahnenfuß Zimbelkrautblättriges | Ivy- leaved Buttercup | Ranunculaceae |
| Ranunculus cytheraeus | Hahnenfuß Kithira | Kithira Buttercup | Ranunculaceae |
| Ranunculus dahlgreniae | Wasserhahnenfuß Dahlgrens | Dahlgrens Water- Crowfoot | Ranunculaceae |
| Ranunculus demissus | Hahnenfuß Hängender | Drooping Buttercup | Ranunculaceae |
| Ranunculus flammula | Hahnenfuß Brennender | Small Marsh Buttercup | Ranunculaceae |
| Ranunculus fluitans | Hahnenfuß Flutender | River Water- Crowfoot | Ranunculaceae |
| Ranunculus fontanus | Hahnenfuß Quell | Source Buttercup | Ranunculaceae |
| Ranunculus fucoides | Wasserhahnenfuß Buschiger | Small- fruited Water- Crowfoot | Ranunculaceae |
| Ranunculus glacialis | Hahnenfuß Gletscher | Glacier Buttercup | Ranunculaceae |
| Ranunculus gouanii | Hahnenfuß Gouans | Gouan's Buttercup | Ranunculaceae |
| Ranunculus gracilis | Hahnenfuß Zierlicher | Gracile Buttercup | Ranunculaceae |
| Ranunculus gramineus | Hahnenfuß Grasblättriger | Grassleaf- Buttercup | Ranunculaceae |
| Ranunculus granatensis | Hahnenfuß Granada | Granada Buttercup | Ranunculaceae |
| Ranunculus gregarius | Hahnenfuß Geselliger | Gregarious Buttercup | Ranunculaceae |
| Ranunculus hayekii | Hahnenfuß Hayeks | Hayek's Buttercup | Ranunculaceae |
| Ranunculus hederaceus | Wasserhahnenfuß Efeu | Ivy Water- Crowfoot | Ranunculaceae |
| Ranunculus henriquesii | Hahnenfuß Henriques' | Henriques's Buttercup | Ranunculaceae |
| Ranunculus hybridus | Hahnenfuß Nierenblättriger | Hybrid Buttercup | Ranunculaceae |
| Ranunculus illyricus | Hahnenfuß Illyrischer | Illyrian Buttercup | Ranunculaceae |
| Ranunculus incomparabilis | Hahnenfuß Unvergleichlicher | Incomparable Buttercup | Ranunculaceae |
| Ranunculus isthmicus | Hahnenfuß Isthmischer | Isthmian Buttercup | Ranunculaceae |
| Ranunculus kuepferi | Hahnenfuß Küpfers | Kuepfer's Buttercup | Ranunculaceae |
| Ranunculus lanuginosus | Hahnenfuß Wolliger | Wooly-leaved Buttercup | Ranunculaceae |
| Ranunculus lateriflorus | Hahnenfuß Seitenblütiger | Lateral- flowered Buttercup | Ranunculaceae |
| Ranunculus lingua | Hahnenfuß Zungen | Water Buttercup | Ranunculaceae |
| Ranunculus longipes | Hahnenfuß Langstieliger | Long- stalked Buttercup | Ranunculaceae |
| Ranunculus lusitanicus | Wasserhahnenfuß Portugiesischer | Portuguese Crowfoot | Ranunculaceae |
| Ranunculus macrophyllus | Hahnenfuß Großblättriger | Large- leaved Buttercup | Ranunculaceae |
| Ranunculus magellensis | Hahnenfuß Majella | Majella Buttercup | Ranunculaceae |
| Ranunculus malessanus | Hahnenfuß Sierra Malessa | Sierra Malessa Buttercup | Ranunculaceae |
| Ranunculus marginatus | Hahnenfuß Berandeter | Margined Buttercup | Ranunculaceae |
| Ranunculus marschlinsii | Hahnenfuß Salis- Marschlins | Salis- Marschlins Buttercup | Ranunculaceae |
| Ranunculus millefoliatus | Hahnenfuß Tausendblättriger | Thousand- leaved Buttercup | Ranunculaceae |
| Ranunculus millii | Hahnenfuß Mills' | Mill's Buttercup | Ranunculaceae |
| Ranunculus monspeliacus | Hahnenfuß Montpellier | Montpellier Buttercup | Ranunculaceae |
| Ranunculus montanus | Hahnenfuß Berg | Mountain Buttercup | Ranunculaceae |
| Ranunculus muricatus | Hahnenfuß Stachelfrüchtiger | Spinyfruit Buttercup | Ranunculaceae |
| Ranunculus nigrescens | Hahnenfuß Schwärzlicher | Blackish Buttercup | Ranunculaceae |
| Ranunculus nodiflorus | Hahnenfuß Knotenblütiger | Knot- flowered Buttercup | Ranunculaceae |
| Ranunculus ololeucos | Wasserhahnenfuß Reinweißer | White- flowered Water- Crowfoot | Ranunculaceae |
| Ranunculus neapolitanus | Hahnenfuß Neapolitanischer | Naples Buttercup | Ranunculaceae |
| Ranunculus nemorosus | Hahnenfuß Hain | Wood Buttercup | Ranunculaceae |
| Ranunculus ollissiponensis | Hahnenfuß Lissabonner | Lisboan Buttercup | Ranunculaceae |
| Ranunculus omiophyllus | Wasserhahnenfuß Westlicher | Round- leaved Water- Crowfoot | Ranunculaceae |
| Ranunculus ophioglossifolius | Hahnenfuß Natternzungenblättriger | Adder's Tongue Buttercup | Ranunculaceae |
| Ranunculus oxyspermus | Hahnenfuß Spitzsamiger | Sharp- seeded Buttercup | Ranunculaceae |
| Ranunculus paludosus | Hahnenfuß Sumpf | Jersey Buttercup | Ranunculaceae |
| Ranunculus parnassiifolius | Hahnenfuß Herzblättriger | Parnassia- leaved Buttercup | Ranunculaceae |
| Ranunculus parviflorus | Hahnenfuß Kleinblütiger | Small- flowered Buttercup | Ranunculaceae |
| Ranunculus pedatus | Wasserhahnenfuß Fußförmiger | Bird's Foot Buttercup | Ranunculaceae |
| Ranunculus peltatus | Wasserhahnenfuß Schild | Pond Water- Crowfoot | Ranunculaceae |
| Ranunculus penicillatus | Wasserhahnenfuß Pinselblättriger | Stream Water- Crowfoot | Ranunculaceae |
| Ranunculus platanifolius | Hahnenfuß Platanenblättriger | Large White Buttercup | Ranunculaceae |
| Ranunculus polyanthemoides | Hahnenfuß Verschiedenschnäbliger | False Multiflowered Buttercup | Ranunculaceae |
| Ranunculus polyanthemophyllus | Hahnenfuß Schlitzblättriger | Cutleaf Buttercup | Ranunculaceae |
| Ranunculus polyanthemos | Hahnenfuß Vielblütiger | Multiflowered Buttercup | Ranunculaceae |
| Ranunculus pratensis | Hahnenfuß Wiesen | Meadow Buttercup | Ranunculaceae |
| Ranunculus pseudofluitans | Hahnenfuß Falscher Flutender | False River Water- Crowfoot | Ranunculaceae |
| Ranunculus pseudomillefoliatus | Hahnenfuß Falscher Tausenblättriger | False Thousand- leaved Buttercup | Ranunculaceae |
| Ranunculus psilostachys | Hahnenfuß Flaumiger | Fuzzy Buttercup | Ranunculaceae |
| Ranunculus pygmaeus | Hahnenfuß Zwerg | Pygmy Buttercup | Ranunculaceae |
| Ranunculus pyrenaeus | Hahnenfuß Pyrenäen | Pyrenean Buttercup | Ranunculaceae |
| Ranunculus radinotrichus | Hahnenfuß Strahlhaariger | Ray- haired Buttercup | Ranunculaceae |
| Ranunculus repens | Hahnenfuß Kriechender | Creeping Buttercup | Ranunculaceae |
| Ranunculus reptans | Hahnenfuß Ufer | Shore Buttercup | Ranunculaceae |
| Ranunculus revelieri | Hahnenfuß Revelieres | Revelier's Buttercup | Ranunculaceae |
| Ranunculus rionii | Wasserhahnenfuß Rions | Rion's Water- Crowfoot | Ranunculaceae |
| Ranunculus rumelicus | Hahnenfuß Rumelischer | Rumelian Buttercup | Ranunculaceae |
| Ranunculus ruscinonensis | Hahnenfuß Roussillon | Rumelian Buttercup | Ranunculaceae |
| Ranunculus saniculifolius | Wasserhahnenfuß Sanikelblättriger | Sanicle- leaved Water- Crowfoot | Ranunculaceae |
| Ranunculus sardous | Hahnenfuß Sardischer | Hairy Buttercup | Ranunculaceae |
| Ranunculus sartorianus | Hahnenfuß Sartorius' | Sartorius's Buttercup | Ranunculaceae |
| Ranunculus sceleratus | Hahnenfuß Gift | Cursed Buttercup | Ranunculaceae |
| Ranunculus seguieri | Hahnenfuß Seguiers | Seguier's Buttercup | Ranunculaceae |
| Ranunculus serbicus | Hahnenfuß Serbischer | Serbian Buttercup | Ranunculaceae |
| Ranunculus serpens | Hahnenfuß Wurzelnder | Crawling Buttercup | Ranunculaceae |
| Ranunculus sphaerospermus | Wasserhahnenfuß Kugelsamiger | Globe- seeded Water- Crowfoot | Ranunculaceae |
| Ranunculus spicatus | Hahnenfuß Ähriger | Spiked Buttercup | Ranunculaceae |
| Ranunculus sprunerianus | Hahnenfuß Spruners | Spruner's Buttercup | Ranunculaceae |
| Ranunculus subhomophyllus | Hahnenfuß Gleichblättriger | Equal- leaved Buttercup | Ranunculaceae |
| Ranunculus thasius | Hahnenfuß Thasos | Thasos Buttercup | Ranunculaceae |
| Ranunculus thomasii | Hahnenfuß Thomas' | Thomas's Buttercup | Ranunculaceae |
| Ranunculus thora | Hahnenfuß Schildblatt | Thora Buttercup | Ranunculaceae |
| Ranunculus thracicus | Hahnenfuß Thrakischer | Thracian Buttercup | Ranunculaceae |
| Ranunculus traunfellneri | Hahnenfuß Traunfellners | Traunfellner's Buttercup | Ranunculaceae |
| Ranunculus trichophyllus | Wasserhahnenfuß Haarblättriger | Thread- leaf Water- Crowfoot | Ranunculaceae |
| Ranunculus trilobus | Hahnenfuß Dreilappiger | Threelobe Buttercup | Ranunculaceae |
| Ranunculus tripartitus | Wasserhahnenfuß Dreilappiger | Round- leaved Water-Crowfoot | Ranunculaceae |
| Ranunculus tuberosus | Hahnenfuß Hain | Wood Buttercup | Ranunculaceae |
| Ranunculus velutinus | Hahnenfuß Samtiger | Velvet Buttercup | Ranunculaceae |
| Ranunculus venetus | Hahnenfuß Venetischer | Venetian Buttercup | Ranunculaceae |
| Ranunculus veronicae | Hahnenfuß Veronicas | Veronica's Buttercup | Ranunculaceae |
| Ranunculus villarsii | Hahnenfuß Grenier | Villars's Buttercup | Ranunculaceae |
| Ranunculus wettsteinii | Hahnenfuß Wettsteins | Wettstein's Buttercup | Ranunculaceae |
| Ranunculus weyleri | Hahnenfuß Weylers | Weyler's Buttercup | Ranunculaceae |
| Ranunculus x lutarius | Wasserhahnenfuß Schlamm | Mud Crowfoot | Ranunculaceae |
| Reaumuria vermiculata | Reaumurie Wurmförmige | Wormlike Reaumuria | Tamaricaceae |
| Reichardia gaditana | Reichardie Gaditana | Gaditana Reichhardia | Asteraceae |
| Reichardia intermedia | Reichardie Mittelmeer | Mediterreanean Reichardia | Asteraceae |
| Reichardia picroides | Reichardie Bitterkraut | Common Reichardia | Asteraceae |
| Reichardia tingitana | Reichardie Tanger | False Sowthistle | Asteraceae |
| Reseda alba | Resede Weiße | White Mignonette | Resedaceae |
| Reseda barrelieri | Resede Barreliers | Barrelier's Mignonette | Resedaceae |
| Reseda complicata | Resede Gefaltete | Pleated Mignonette | Resedaceae |
| Reseda glauca | Resede Blaugrüne | Pyrenean Mignonette | Resedaceae |
| Reseda gredensis | Resede Sierra de Gredos | Sierra de Gredos Mignonette | Resedaceae |
| Reseda inodora | Resede Geruchlose | Inodorous Mignonette | Resedaceae |
| Reseda jacquinii | Resede Jacquins | Jacquins Mignonette | Resedaceae |
| Reseda lanceolata | Resede Lanzettblättrige | Lanca- leaved Mignonette | Resedaceae |
| Reseda lutea | Resede Gelbe | Yellow Mignonette | Resedaceae |
| Reseda luteola | Resede Färber | Dyer's Mignonette | Resedaceae |
| Reseda media | Resede Mittlere | Intermediate Mignonette | Resedaceae |
| Reseda minoica | Resede Minoische | Minoan Mignonette | Resedaceae |
| Reseda odorata | Resede Garten | Garden Mignonette | Resedaceae |
| Reseda phyteuma | Resede Rapunzel | Rampion Mignonette | Resedaceae |
| Reseda stricta | Resede Steife | Stiff Mignonette | Resedaceae |
| Reseda suffruticosa | Resede Halbstrauchige | Shrubby Mignonette | Resedaceae |
| Reseda tymphaea | Resede Mt. Tymfi | Mt. Tymfi Mignonette | Resedaceae |
| Reseda undata | Resede Wellblättrige | Undulate Mignonette | Resedaceae |
| Reseda valentina | Resede Valencianische | Valentine Mignonette | Resedaceae |
| Reseda virgata | Resede Ruten | Rod- shaped Mignonette | Resedaceae |
| Retama monosperma | Ginster Einsamiger | Bridal Broom | Fabaceae |
| Retama raetam | Ginster Weißer | White Broom | Fabaceae |
| Retama sphaerocarpa | Ginster Kugelfrüchtiger | Globe- fruited Broom | Fabaceae |
| Rhagadiolus edulis | Sichelsalat Essbarer | Edible Hawkbit | Asteraceae |
| Rhagadiolus stellatus | Sichelsalat Sternfrüchtiger | Star Hawkbit | Asteraceae |
| Rhamnus alaternus | Kreuzdorn Immergrüner | Mediterranean Buckthorn | Rhamnaceae |
| Rhamnus alpina | Kreuzdorn Alpen | Alpine Buckthorn | Rhamnaceae |
| Rhamnus cathartica | Kreuzdorn Purgier | Common Buckthorn | Rhamnaceae |
| Rhamnus fallax | Kreuzdorn Krainer | Carniolan Buckthorn | Rhamnaceae |
| Rhamnus glaucophylla | Kreuzdorn Blaugrüner | Apuanian Buckthorn | Rhamnaceae |
| Rhamnus infectoria | Kreuzdorn Färbender | Dyeing Buckthorn | Rhamnaceae |
| Rhamnus intermedia | Kreuzdorn Mittlerer | Intermediate Buckthorn | Rhamnaceae |
| Rhamnus lojaconoi | Kreuzdorn Lojaconos | Lojacono's Buckthorn | Rhamnaceae |
| Rhamnus ludovici- salvatoris | Erzherzog Ludwig- Salvator Kreuzdorn | Balearic Buckthorn | Rhamnaceae |
| Rhamnus lycioides | Kreuzdorn Bocksdornartiger | Lycium- like Buckthorn | Rhamnaceae |
| Rhamnus lycioides ssp. graeca | Kreuzdorn Griechischer | Greek Buckthorn | Rhamnaceae |
| Rhamnus myrtifolia | Kreuzdorn Myrtenblättriger | Myrtle- leaved Buckthorn | Rhamnaceae |
| Rhamnus oleoides | Kreuzdorn Ölbaum | Olive Buckthorn | Rhamnaceae |
| Rhamnus oleoides ssp. oleoides | Kreuzdorn Ölbaum Gewöhnlicher | Common Olive Buckthorn | Rhamnaceae |
| Rhamnus orbiculata | Kreuzdorn Rundblättriger | Round- leaved Buckthorn | Rhamnaceae |
| Rhamnus persicifolia | Kreuzdorn Pfirsichblättriger | Sardinian Buckthorn | Rhamnaceae |
| Rhamnus pichleri | Kreuzdorn Pichlers | Pichler's Buckthorn | Rhamnaceae |
| Rhamnus pumila | Kreuzdorn Zwerg | Dwarf Buckthorn | Rhamnaceae |
| Rhamnus saxatilis | Kreuzdorn Felsen | Rock Buckthorn | Rhamnaceae |
| Rhamnus sibthorpiana | Kreuzdorn Sibthorps | Sibthorp's Buckthorn | Rhamnaceae |
| Rhamnus velutina | Kreuzdorn Samtiger | Velvet Buckthorn | Rhamnaceae |
| Rhaponticoides africana | Flockenblume Afrikanische | African Knapweed | Asteraceae |
| Rhaponticoides alpina | Flockenblume Alpen | Alpine Knapweed | Asteraceae |
| Rhaponticoides amplifolia | Flockenblume Großblatt | Big- leaf Knapweed | Asteraceae |
| Rhaponticoides calabrica | Flockenblume Kalabrische | Calabrian Knapweed | Asteraceae |
| Rhaponticoides centaurium | Flockenblume Centaurus | Centaur Knapweed | Asteraceae |
| Rhaponticoides fraylensis | Flockenblume Vicentinische | Costa Vicentina Knapweed | Asteraceae |
| Rhaponticum centauroides | Bergscharte Flockenblumenähnliche | Knapweed- like Rhaponticum | Asteraceae |
| Rhaponticum coniferum | Bergscharte Zapfenkopf | Cone Rhaponticum | Asteraceae |
| Rhaponticum exaltatum | Bergscharte Hohe | High Rhaponticum | Asteraceae |
| Rhaponticum heleniifolium | Bergscharte Heleniumblättrige | Helenium- leaved Rhaponticum | Asteraceae |
| Rhaponticum longifolium | Bergscharte Langblättrige | Long- leaved Rhaponticum | Asteraceae |
| Rhaponticum repens | Federblume Kriechende | Creeping Rhaponticum | Asteraceae |
| Rhaponticum scariosum | Bergscharte Alpen | Giant Rhaponticum | Asteraceae |
| Rheum officinale | Rhabarber Medizinischer | Chinese Rhubarb | Polygonacea |
| Rheum palmatum | Rhabarber Zier | Red- flowered Rhubarb | Polygonacea |
| Rheum rhabarbarum | Rhabarber Gewöhnlicher | Garden Rhubarb | Polygonacea |
| Rheum rhaponticum | Rhabarber Bulgarischer | Rhapontic Rhubarb | Polygonacea |
| Rhinanthus alectorolophus | Klappertopf Zottiger | Hirsute Yellow- Rattle | Orobanchaceae |
| Rhinanthus antiquus | Klappertopf Bergamasker | Bergamaskian Yellow- Rattle | Orobanchaceae |
| Rhinanthus borbasii | Klappertopf Puszta | Borbas's Yellow- Rattle | Orobanchaceae |
| Rhinanthus burnatii | Klappertopf Burnats | Burnat's Yellow- Rattle | Orobanchaceae |
| Rhinanthus carinthiacus | Klappertopf Kärntner | Carinthian Yellow- Rattle | Orobanchaceae |
| Rhinanthus freynii | Klappertopf Freyns | Freyn's Yellow- Rattle | Orobanchaceae |
| Rhinanthus glacialis | Klappertopf Grannen | Aristate Yellow- Rattle | Orobanchaceae |
| Rhinanthus melampyroides | Klappertopf Wachtelweizenähnlicher | Cow- Wheat like Yellow- Rattle | Orobanchaceae |
| Rhinanthus minor | Klappertopf Kleiner | Little Yellow- Rattle | Orobanchaceae |
| Rhinanthus pampaninii | Klappertopf Pampaninis | Pampanini's Yellow- Rattle | Orobanchaceae |
| Rhinanthus pindicus | Klappertopf Pindos | Pindos Yellow- Rattle | Orobanchaceae |
| Rhinanthus pseudoantiquus | Klappertopf Falscher Bergamasker | False Bergamaskian Yellow- Rattle | Orobanchaceae |
| Rhinanthus pubescens | Klappertopf Behaarter | Hairy Yellow- Rattle | Orobanchaceae |
| Rhinanthus pumilus | Klappertopf Niedriger | Dwarf Yellow- Rattle | Orobanchaceae |
| Rhinanthus riphaeus | Klappertopf Alpen | Alpine Yellow- Rattle | Orobanchaceae |
| Rhinanthus rumelicus | Klappertopf Drüsiger | Rumelian Yellow- Rattle | Orobanchaceae |
| Rhinanthus serotinus | Klappertopf Großer | Late- flowering Yellow- Rattle | Orobanchaceae |
| Rhinanthus sintenisii | Klappertopf Sintenis' | Sintenis's Yellow- Rattle | Orobanchaceae |
| Rhinanthus wagneri | Klappertopf Wagners | Wagner's Yellow- Rattle | Orobanchaceae |
| Rhinanthus wettsteinii | Klappertopf Wettsteins | Wettstein's Yellow- Rattle | Orobanchaceae |
| Rhodalsine geniculata | Miere Gekniete | Woody Sandwort | Caryophyllaceae |
| Rhodanthemum arundinum | Rosamargerite Arundo | Arundo Daisy | Asteraceae |
| Rhodiola rosea | Rosenwurz Gewöhnliche | Golden Root | Crassulaceae |
| Rhododendron ferrugineum | Alpenrose Rostblättrige | Rusty-leaved Rhododendron | Ericaceae |
| Rhododendron groenlandicum | Porst Grönländischer | Greenlandic Labrador Tea | Ericaceae |
| Rhododendron hirsutum | Alpenrose Bewimperte | Hairy Rhododendron | Ericaceae |
| Rhododendron luteum | Azalee Gelbe | Yellow Azalea | Ericaceae |
| Rhododendron ponticum | Alpenrose Pontische | Pontic Rhododendron | Ericaceae |
| Rhododendron tomentosum | Porst Sumpf | Marsh Labrador Tea | Ericaceae |
| Rhodothamnus chamaecistus | Zwergalpenrose | Dwarf Rhododendron | Ericaceae |
| Rhus coriaria | Sumach Gewürz | Sicilian Sumac | Anacardiaceae |
| Rhus typhina | Sumach Kolben | Staghorn Sumac | Anacardiaceae |
| Rhynchocorys elephas | Persischer Elefantenrüssel | Persian Elefant Flower | Orobanchaceae |
| Ribes alpinum | Johannisbeere Alpen | Alpine Currant | Grossulariaceae |
| Ribes aureum | Johannisbeere Gold | Golden Currant | Grossulariaceae |
| Ribes multiflorum | Johannisbeere Vielblütige | Many- flowered Currant | Grossulariaceae |
| Ribes nigrum | Johannisbeere Schwarze | Black Currant | Grossulariaceae |
| Ribes orientale | Johannisbeere Orientalische | Eastern Currant | Grossulariaceae |
| Ribes petraeum | Johannisbeere Felsen | Rock Currant | Grossulariaceae |
| Ribes rubrum | Johannisbeere Rote | Red Currant | Grossulariaceae |
| Ribes sanguineum | Johannisbeere Blut | Red- flowering Currant | Grossulariaceae |
| Ribes sardoum | Johannisbeere Sardische | Sardinian Currant | Grossulariaceae |
| Ribes spicatum | Johannisbeere Ährige | Downy Currant | Grossulariaceae |
| Ribes uva- crispa | Stachelbeere Europäische | European Gooseberry | Grossulariaceae |
| Ribes x nidigrolaria | Jostabeere | Jostaberry | Grossulariaceae |
| Ricinus communis | Rizinus | Castro Bean | Euphorbiaceae |
| Rindera graeca | Rindera Griechische | Greek Rindera | Boraginaceae |
| Rindera umbellata | Rindera Doldige | Umbellate Rindera | Boraginaceae |
| Robinia hispida | Robinie Borstige | Bristly Locust | Fabaceae |
| Robinia neomexicana | Robinie Neumexiko | New Mexican Locust | Fabaceae |
| Robinia pseudoacacia | Robinie Gewöhnliche | Black Locust | Fabaceae |
| Robinia viscosa | Robinie Klebrige | Clammy Locust | Fabaceae |
| Rochelia disperma | Rochelie Zweisamige | Two- seeded Rochelia | Boraginaceae |
| Roemeria hybrida | Tüpfelmohn Bastard | Violet Hornpoppy | Papaveraceae |
| Roldana petasitis | Greiskraut Pestwurz | Velvet Groundsel | Asteraceae |
| Rosa abietina | Rose Tannen | Needle Rose | Rosaceae |
| Rosa agrestis | Rose Acker | Small- leaved Rose | Rosaceae |
| Rosa arvensis | Rose Kriechende | Field Rose | Rosaceae |
| Rosa balsamica | Rose Stumpfblätterige | Round- leaved Dog Rose | Rosaceae |
| Rosa caesia | Rose Lederblättrige | Hairy Dog Rose | Rosaceae |
| Rosa canina | Rose Hunds | Dog Rose | Rosaceae |
| Rosa carolina | Rose Carolina | Carolina Rose | Rosaceae |
| Rosa caryophyllacea | Rose Nelken | Pink- like Rose | Rosaceae |
| Rosa corymbifera | Rose Hecken | Corymb Rose | Rosaceae |
| Rosa dumalis | Rose Vogesen | Glaucous Dog Rose | Rosaceae |
| Rosa elliptica | Rose Elliptische | Wedge- leaved Rose | Rosaceae |
| Rosa foetida | Rose Fuchs | Persian Yellow Rose | Rosaceae |
| Rosa gallica | Rose Essig | French Rose | Rosaceae |
| Rosa glauca | Rose Rotblättrige | Redleaf Rose | Rosaceae |
| Rosa heckeliana | Rose Heckels | Heckel's Rose | Rosaceae |
| Rosa hugonis | Rose Gold | Golden Rose | Rosaceae |
| Rosa inodora | Rose Duftarme | Scentless Rose | Rosaceae |
| Rosa marginata | Rose Raublättrige | Large- leaved Rose | Rosaceae |
| Rosa majalis | Rose Zimt | Cinnamon Rose | Rosaceae |
| Rosa micrantha | Rose Kleinblütige | Smallflower Rose | Rosaceae |
| Rosa mollis | Rose Weiche | Soft Downy- Rose | Rosaceae |
| Rosa moschata | Rose Moschus | Musk Rose | Rosaceae |
| Rosa montana | Rose Berg | Mountain Rose | Rosaceae |
| Rosa multiflora | Rose Vielblütige | Field Rose | Rosaceae |
| Rosa pendulina | Rose Alpen | Alpine Rose | Rosaceae |
| Rosa phoenicia | Rose Phönizische | Phoenician Rose | Rosaceae |
| Rosa pouzinii | Rose Pouzins | Pouzin's Rose | Rosaceae |
| Rosa pseudoscabriuscula | Rose Falsche Filz | False harsh Downy-Rose | Rosaceae |
| Rosa pulverulenta | Rose Sizilianische | Mediterranean Rose | Rosaceae |
| Rosa rhaetica | Rose Graubündner | Rhaetian Rose | Rosaceae |
| Rosa rubiginosa | Rose Wein | Sweetbriar Rose | Rosaceae |
| Rosa rugosa | Rose Kartoffel | Japanese Rose | Rosaceae |
| Rosa sempervirens | Rose Immergrüne | Evergreen Rose | Rosaceae |
| Rosa spinosissima | Rose Pimpinell | Scotch Rose | Rosaceae |
| Rosa sherardii | Rose Sherards | Sherard's Rose | Rosaceae |
| Rosa stylosa | Rose Verwachsengriffelige | Short- styled Field Rose | Rosaceae |
| Rosa subcanina | Rose Falsche Hunds | False Dog Rose | Rosaceae |
| Rosa subcollina | Rose Falsche Hecken | False Corymb Rose | Rosaceae |
| Rosa tomentosa | Rose Filz | Whitewooly Rose | Rosaceae |
| Rosa turcica | Rose Türkische | Turkish Rose | Rosaceae |
| Rosa villosa | Rose Apfel | Apple Rose | Rosaceae |
| Rosa virginiana | Rose Virginische | Virginia Rose | Rosaceae |
| Rosmarinus eriocalyx | Rosmarin Wollkelch | Wooly- calyced Rosemary | Lamiaceae |
| Rosmarinus officinalis | Rosmarin Echter | Common Rosemary | Lamiaceae |
| Rosmarinus tomentosus | Rosmarin Filziger | Tomentose Rosemary | Lamiaceae |
| Rosularia globulariifolia | Dickröschen Kugelblumenblättriges | Globularia- leaved Liveforever | Boraginaceae |
| Rosularia serrata | Dickröschen Sägeblättriges | Saw- leaved Liveforever | Boraginaceae |
| Rotala densiflora | Rotala Dichtblütige | Dense- flowered Rotala | Lythraceae |
| Rotala filiformis | Rotala Faden | Slender Rotala | Lythraceae |
| Rotala indica | Rotala Indische | Indian Rotala | Lythraceae |
| Rotala ramosior | Rotala Amerikanische | Lowland Rotala | Lythraceae |
| Rotala rotundifolia | Rotala Rundblättrige | Darf Rotala | Lythraceae |
| Rothmaleria granatensis | Rothmalerie Granadische | Granadian Rothmaleria | Asteraceae |