Established
| Common name (English) | |
|---|---|
| Rattus norvegicus | Brown rat |
| Rattus rattus | Black rat |
| Retithrips syriacus | Black vine thrips, Syrian thrips, Castor thrips |
| Rhaponticum repens | Russian knapweed, Russian Centaurea knapweed |
| Rhinoclavis kochi | |
| Rhizobium radiobacter | |
| Rhopalapion longirostre | Hollyhock weevil |
| Rhopalosiphum maidis | Corn leaf aphid; Corn aphid |
| Rhopalosiphum rufiabdominale | Rice root aphid; Red rice root aphid |
| Rhopilema nomadica | Nomad jellyfish |
| Rhynchophorus ferrugineus | Red palm weevil; Asian palm weevil; Sago palm weevil |
| Ricinus communis | Castor bean |
| Rissoina bertholleti | |
| Robinia pseudoacacia | Black locust |
| Rodolia cardinalis | Vedalia beetle; Cardinal ladybird |
| Rotylenchulus parvus | |
| Rubia tinctorum | Dyer's madder |
| Rubus ulmifolius | Blackberry |
| Rumex acetosella subsp. acetoselloides | |
| Saccharum spontaneum |