Pulicaria auranitica 
Pulicaria glutinosa 
Pulicaria incisa 
Pulicaria undulata 
Purple Burr-daisy 
Purple Coneflower 
Purple milk thistle 
Purple salsify 
Purple Star-Thistle 
Purplestem aster 
Racemose pussytoes 
Rattlesnakeweed 
Rayless chamomile 
Rayless Sunflower 
Red Dahlia 
Red Everlasting 
Red-seeded dandelion 
Redflower Ragleaf 
Redpurple Ragwort 
Rice flower 
Rigid Whitetop Aster 
Rock Phagnalon 
Rock thistle 
Rose Rush