Rainbow Pink 
Rattail Cactus flower 
Reaumuria hirtella 
Red Campion 
Red Dock 
Red flower prickly pear 
Red Glasswort 
Red Hot Chili Pepper Cactus 
Red sand spurrey 
Red Sorrel 
Redstem springbeauty 
Regal foxtail 
Reinwardt's Pitcher-Plant 
Rhodalsine geniculata 
Rock buckwheat 
Rock Soapwort 
Rose Campion 
Rosy Sundew 
Round-leaved Sundew 
Rumex aeroplaniformis 
Rumex cyprius 
Rumex nepalensis 
Rumex pictus 
Sabulina tenuifolia