Rhododendron calendulaceum 
Rhododendron campanulatum 
Rhododendron caucasicum 
Rhododendron crassifolium 
Rhododendron durionifolium sabahense 
Rhododendron facetum 
Rhododendron fauriei 
rhododendron grande 
Rhododendron indicum 
Rhododendron laetum 
Rhododendron simsii 
Rhododendron stenophyllum 
Rhododendron wilkiei 
Rhododendron zoelleri 
Riber Ebony 
River Mangrove 
Royal Azalea 
Rusty menziesia 
Samolus valerandi 
Sarracenia alata 
Saurauia napaulensis 
Scarlet Gilia 
Scarlet pimpernel 
Schima wallichii