Rhubarb Rhubarb, Giant
'Rhythm 'n' Blues' Dwarf Blue Corydalis Ribbon Fan Palm
Ribbon Plant (spp.) Ribbon Plant Variegated
Ribbonwood Riberry
Rice Flower Rice Flower, Pink
Rice Flower: ferruginea, Pink Rice Gasteria
Rice Paper Plant Rice Paper Plant, Chinese
Rice Paper Plant: quinquefolia 'Rich and Famous' Louisiana Iris
'Richland Gold' Hosta 'Richmond' Florist's Chrysanthemum
'Richmond' Heavenly Bamboo 'Riegel's Big Blue' Lilyturf
Rieger Begonia (spp.) Rieger Begonia 'Betulia Red'
'Right On' Daylily 'Rigid Dwarf' Hinoki False Cypress
Rigid Twinspur Rigidella
'Rigoletto' Dahlia 'Rikki' Dracaena: deremensis
Rimu Ring Cupped Oak
'Ring of Fire' Alumroot: Heuchera 'Ring of Fire' Common Sunflower
'Ringlets' Daylily Rio Grande Copper Lily
'Rio Samba' Rose 'Rio' Zonal Geranium
Rising Sun Maple 'Rita Marie Green' Allamanda
'Ritz Rocket' Amaranth: hybrid 'Rivendell' Florist's Chrysanthemum
River Birch (spp.) River Birch 'Summer Cascade'
River Birch: nigra minor 'River Hawk' Tall Bearded German Iris
River Jam River Maple (spp.)
River Maple 'Beebe' River Maple 'Pyramidale'
River Maple 'Silver Queen' River Maple 'Skinneri'
River Maple 'Wieri' River Oats
River Red Eucalyptus River Red Gum
'Rivereorum' Chinese Goddess Bamboo 'Riversii' European Beech
Robb's Spurge Robby
'Robella' English Daisy 'Robert Culpepper' Japanese Holly
'Robert Frost' Hosta 'Robert' Purple Loosestrife
'Robin (Songbird Series)(n)' Columbine 'Robin Hill' Apple Serviceberry
'Robinson' Flowering Crabapple 'Robinson Hybrids' Painted Daisy
'Robinson's Mix' Painted Daisy 'Robinson's Red' Painted Daisy
Roble Beech Roble Guayo
Robust Acacia 'Robusta' Early Forsythia
'Robusta Green' Chinese Juniper 'Robusta' Hedge Nettle
'Robusta' Hosta: fortunei 'Robusta' Woundwort
'Robustissima' Hardy Grape Leaf Anemone