Redberry Buckthorn      

Redberry Juniper          

Redbud          

Redclay Suncup          

Redfuzz Saxifrage          

Redmaids          

Redosier Dogwood          

Redpod Stonecrop          

Redray Alpinegold          

Redroot Amaranth          

Redroot Buckwheat          

Redroot Cryptantha          

Redroot Flatsedge      

Redseed Plantain          

Redspine Fishhook Cactus          

Redstem          

Redstem Springbeauty          

Redtop      

Redwhisker Clammyweed          

Redwool Plantain          

Reed          

Reed Canarygrass      

Reedgrass          

Reflected Grapefern          

Relaxgrass          

Remarkable Goatsbeard          

Rescuegrass      

Resinleaf Brickellbush          

Reverchonia          

Rhizome Fleabane          

Rhodes Grass      

Rhynchosida          

Ribbed Cryptantha          

Ribbed False Pennyroyal          

Ribseed Sandmat          

Rice Cutgrass      

Ricegrass          

Ricinus          

Rillita Pellitory          

Rimrock Milkvetch          

Rincon Mountain Indian Paintbrush          

Rincon Mountain Rockcress          

Rincon Rubberweed          

Ring Muhly