Ru - Rz
| Rubia balearica | Röte Balearen | Balearic Madder | Rubiaceae |
| Rubia peregrina | Röte Wilde | Wild Madder | Rubiaceae |
| Rubia tenuifolia | Röte Schmallblättige | Narro- leaved Madder | Rubiaceae |
| Rubia tinctorium | Färber- Röte | Dyer's Madder | Rubiaceae |
| Rubus caesius | Kratzbeere | European Dewberry | Rosaceae |
| Rubus canescens | Brombeere Filz | Wooly Bramble | Rosaceae |
| Rubus chamaemorus | Moltebeere | Cloudberry | Rosaceae |
| Rubus hirtus | Brombeere Dunkeldrüsige | Dark- glandular Bramble | Rosaceae |
| Rubus idaeus | Himbeere Gewöhnliche | Common Rasberry | Rosaceae |
| Rubus parviflorus | Himbeere Nutka | Thimbleberry | Rosaceae |
| Rubus phoenicolasius | Himbeere Rotborstige | Wine Rasberry | Rosaceae |
| Rubus odoratus | Himbeere Zimt | Purple-Flowering Raspberry | Rosaceae |
| Rubus saxatilis | Steinbeere | Stone Bramble | Rosaceae |
| Rubus sanctus | Brombeere Heilige | Holy Bramble | Rosaceae |
| Rubus spectabilis | Himbeere Pracht | Salmonberry | Rosaceae |
| Rubus x pseudidaeus | Bastard- Himbeere | Bastard Raspberry | Rosaceae |
| Rudbeckia fulgida | Sonnenhut Leuchtender | Orange Coneflower | Asteraceae |
| Rudbeckia grandiflora | Sonnenhut Großblütiger | Rough Coneflower | Asteraceae |
| Rudbeckia hirta | Sonnenhut Rauer | Hirsute Coneflower | Asteraceae |
| Rudbeckia laciniata | Sonnenhut Schlitzblättriger | Cutleaf Coneflower | Asteraceae |
| Rudbeckia triloba | Sonnenhut Dreilappiger | Branched Coneflower | Asteraceae |
| Rumex acetosa | Sauerampfer Großer | Common Sorrel | Polygonaceae |
| Rumex acetosella | Sauerampfer Kleiner | Sheep's Sorrel | Polygonaceae |
| Rumex aquaticus | Ampfer Wasser | Scottish Dock | Polygonaceae |
| Rumex aquitanicus | Ampfer Aquitanischer | Calabrian Dock | Polygonaceae |
| Rumex alpinus | Ampfer Alpen | Alpine Dock | Polygonaceae |
| Rumex arifolius | Sauerampfer Berg | Mountain Sorrel | Polygonaceae |
| Rumex balcanicus | Ampfer Balkan | Balkans Dock | Polygonaceae |
| Rumex bucephalophorus | Ampfer Stierkopf | Horned Dock | Polygonaceae |
| Rumex confertus | Ampfer Gedrungener | Russian Dock | Polygonaceae |
| Rumex conglomeratus | Ampfer Knäuel | Clustered Dock | Polygonaceae |
| Rumex crispus | Ampfer Krauser | Curled Dock | Polygonaceae |
| Rumex cristatus | Ampfer Griechischer | Crested Dock | Polygonaceae |
| Rumex dentatus | Ampfer Gezähnter | Toothed Dock | Polygonaceae |
| Rumex frutescens | Ampfer Strauchiger | Argentine Dock | Polygonaceae |
| Rumex hydrolapathum | Ampfer Fluss | Great Water Dock | Polygonaceae |
| Rumex induratus | Sauerampfer Blasen | Bladder Sorrel | Polygonaceae |
| Rumex intermedius | Sauerampfer Mittlerer | Intermediate Sorrel | Polygonaceae |
| Rumex kerneri | Ampfer Kerners | Kerner's Dock | Polygonaceae |
| Rumex longifolius | Ampfer Gemüse | Dooryard Dock | Polygonaceae |
| Rumex lunaria | Ampfer Kanaren | Canary Dock | Polygonaceae |
| Rumex maritimus | Sauerampfer Strand | Golden Dock | Polygonaceae |
| Rumex nebroides | Sauerampfer Gussones | Gussone's Sorrel | Polygonaceae |
| Rumex nepalensis | Ampfer Nepalesischer | Nepalese Dock | Polygonaceae |
| Rumex nivalis | Sauerampfer Schnee | Snow Sorrel | Polygonaceae |
| Rumex obtusifolius | Ampfer Stumpfblättriger | Broad- leaved Dock | Polygonaceae |
| Rumex obtusifolius ssp. sylvestris | Ampfer Östlicher | Wood Dock | Polygonaceae |
| Rumex palustris | Sauerampfer Sumpf | Marsh Dock | Polygonaceae |
| Rumex papillaris | Sauerampfer Warziger | Papillose Sorrel | Polygonaceae |
| Rumex patientia | Ampfer Garten | Patience Dock | Polygonaceae |
| Rumex pseudonatronatus | Ampfer Finnischer | Field Dock | Polygonaceae |
| Rumex pulcher | Ampfer Schöner | Fiddle Dock | Polygonaceae |
| Rumex pulcher ssp. anodontus | Ampfer Zahnloser | Toothless Dock | Polygonaceae |
| Rumex roseus | Sauerampfer Tanger | Tanger Sorrel | Polygonaceae |
| Rumex rugosus | Sauerampfer Garten | Garden Sorrel | Polygonaceae |
| Rumex rupestris | Ampfer Felsen | Shore Dock | Polygonaceae |
| Rumex sanguineus | Ampfer Blut | Redvein Dock | Polygonaceae |
| Rumex scutatus | Sauerampfer Schild | French Sorrel | Polygonaceae |
| Rumex stenophyllus | Ampfer Schmalblättriger | Narrow- leaved Dock | Polygonaceae |
| Rumex suffruticosus | Sauerampfer Strauchiger | Shrubby Sorrel | Polygonaceae |
| Rumex thyrsiflorus | Sauerampfer Rispenblütiger | Thyrse- flowered Sorrel | Polygonaceae |
| Rumex thyrsoides | Sauerampfer Rispiger | Thyrse Sorrel | Polygonaceae |
| Rumex triangulivalvis | Ampfer Weidenblättriger | Willow- leaved Dock | Polygonaceae |
| Rumex tuberosus | Sauerampfer Knolliger | Tuberous Sorrel | Polygonaceae |
| Rumex tuberosus ssp. horizontalis | Sauerampfer Waagrechter | Horizontal Sorrel | Polygonaceae |
| Rumex vesicarius | Sauerampfer Blasen | Bladder Sorrel | Polygonaceae |
| Rumex x heterophyllus | Ampfer Verschiedenblättriger | Diversely- leaved Dock | Polygonaceae |
| Rumex x pratensis | Ampfer Wiesen | Meadow Dock | Polygonaceae |
| Rupicapnos africana ssp. decipiens | Felsrauch Täuschender | Fooling Rupicapnos | Papaveraceae |
| Ruppia drepanensis | Salde Trapanische | Trapani Ditch- Grass | Ruppiaceae |
| Ruppia maritima | Salde Meeres | Common Ditch- Grass | Ruppiaceae |
| Ruppia spiralis | Salde Strand | Spiral Ditch- Grass | Ruppiaceae |
| Ruscus aculeatus | Mäusedorn Stechender | Pungent Butcher's Broom | Convallariaceae |
| Ruscus hypoglossum | Mäusedorn Zungen | Spineless Butcher's Broom | Convallariaceae |
| Ruscus hypophyllum | Mäusedorn Westmediterraner | Greater Butcher's Broom | Convallariaceae |
| Ruta angustifolia | Raute Schmalblättrige | Small- leaved Rue | Rutaceae |
| Ruta chalepensis | Raute Gefranste | Fringed Rue | Rutaceae |
| Ruta corsica | Raute Korsische | Corsican Rue | Rutaceae |
| Ruta graveolens | Raute Wein | Common Rue | Rutaceae |
| Ruta lamarmorae | Raute Gennargentu | Gennargentu Rue | Rutaceae |
| Ruta montana | Raute Berg | Mountain Rue | Rutaceae |