| | Plattdeutscher Name | Deutscher Name | Englischer Name | Botanischer Name | | Roer (Schleswig) | Kornrade, Gewoehnliche | Corn Cockle | Agrostemma githago |
| Roerk (Schleswig-Holstein) | Kornrade, Gewoehnliche | Corn Cockle | Agrostemma githago |
| Roester (Ostpreussen+Pommern) | Flatterulme = Ulme, Flatter | Elm, Russian | Ulmus laevis |
| Roester (Schleswig-Holstein) | Ulme, Flatter | Elm, Russian | Ulmus laevis |
| Roetjen (Dithmarschen) | Wasserlinse, Kleine | Duckweed, Common | Lemna minor |
| Roggenprume (Westfalen) | Haferschlehe | Sloe, Oats | Prunus x fruticans |
| Rohr | Schilf, Gewoehnliches | Reed, Common | Phragmites australis |
| Rohr | Schilf, Gewoehnliches | Grass, Reed | Phragmites australis |
| Rohrhaar (Nordfriesland/Schlesw.) | Schachtelhalm, Acker- | Horsetail, Common | Equisetum arvense |
| Rokopp (Westfalen) | Pfaffenhuetchen, Gewoehnliches | Spindle, Common | Euonymus europaeus |
| Rooboeken (Schleswig) | Buche, Rot- | Beech, Common | Fagus sylvatica |
| Roodboeken (Schleswig-Holstein) | Buche, Blut- | Beech, Blood | Fagus sylvatica `Purpurea` |
| Roode Hinnerk (Bremen) | Ampfer, Fluss- | Dock, Water | Rumex hydrolapathum |
| Roode Kattsteert (Ostfriesland) | Weidenroeschen, Zottiges | Willowherb Hairy | Epilobium hirsutum |
| Roode Wilge (Oldenburg in O.) | Hartriegel, Blutroter | Dogwood, Common + Dogberry | Cornus sanguinea |
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