Red Oak, Northern Red Oak
Red Queen's Wreath
Red Spike Iceplant
Red Yucca
River She-Oak
Rock Pea
Rock Penstemon
Rock Slide Dicliptera
Rocky Mountain Penstemon
Rocky Point Ice Plant
Rose Of Sharon, Shrub Althaea
Rosemary
Rosemary Collingwood Ingram
Rosemary Huntington Carpet
Rosemary Tuscan Blue
Rough Daisy Devil's River
Rough-Leafed Agave
Royal Beard Tongue, Showy Penstemon
Ruby Glow Sedum
Russian Olive, Oleaster