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| Common Name | Scientific Name | |
| Rabbitfoot Clover | Trifolium arvense | |
| Radish, Wild | Raphanus raphanistrum | |
| Ragweed, Common | Ambrosia artemisiifolia | |
| Ragweed, Giant | Ambrosia trifida | |
| Ragwort, Wooly | Senecio tomentosus | |
| Rattlesnake Weed | Stachys floridana | |
| Red Clover | Trifolium pratense | |
| Red Deadnettle | Lamium purpureum | |
| Red Morningglory | Ipomoea coccinea | |
| Red Rice | Oryza sativa | |
| Redroot Pigweed | Amaranthus retroflexus | |
| Red Sorrel | Rumex acetosella | |
| Redstem Filaree | Erodium cicutarium | |
| Redvine | Brunnichia ovata | |
| Reed, Common | Phragmites australis | |
| Rice Flatsedge | Cyperus iria | |
| Rose, Multiflora | Rosa multiflora | |
| Roughstalk Bluegrass | Poa trivialis | |
| Rush, Creeping | Juncus repens | |
| Ryegrass, Annual | Lolium multiflorum |
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