Rabbitfoot Clover
Rabbitsfoot Grass
Radish
Ragweed
Ragwort
Ramp
Rampion Bellflower
Rannoch-rush
Rattlesnake Brome
Rattlesnake Fern
Rattlesnakeroot
Rayless Alkali Aster
Rayless Tansyaster
Red Baneberry
Red Clover
Red Columbine
Red Currant
Red Elderberry
Red Fescue
Red Goosefoot
Red Haw
Red Swampfire
Redosier Dogwood
Redroot Amaranth
Redroot Flatsedge
Redstem
Redtop
Redwhisker Clammyweed
Redwool Plantain
Reed
Reed Canarygrass
Reedgrass
Rescuegrass
Reversed Clover
Ribseed Sandmat
Rice Cutgrass
Ricegrass
Rigid Sedge
River Bulrush
Riverbank Grape
Rivergrass
Riverweed
Roadside Agrimony
Rock Clematis
