Rabbit-tobacco
Rabbitbrush
Rabbitfoot Clover
Rabbitsfoot Grass
Radish
Radishroot Woodsorrel
Ragweed
Ragwort
Rainlily
Rampion Bellflower
Ramtilla
Rape
Ratany
Rattlebox
Rattlesnake Fern
Rattlesnakeroot
Ravenfoot Sedge
Ravennagrass
Rayless Alkali Aster
Red Baneberry
Red Clover
Red Columbine
Red Dome Blanketflower
Red Goosefoot
Red Lovegrass
Red Mulberry
Red River Scaleseed
Red Swampfire
Redbud
Redosier Dogwood
Redroot Amaranth
Redroot Flatsedge
Redseed Plantain
Redstar
Redstem
Redtop
Redtop Panicgrass
Redwhisker Clammyweed
Reed
Reed Canarygrass
Reedgrass
Reflexed Sedge
Rescuegrass
Resurrection Fern
