Purslane: umbellata, Rock Pussy Ears
Pussytoes 'Rubra' Pussytoes, Stoloniferous 'Rubra'
Pussytoes: parvifolia Pussytoes: rosea
Puya Puya: coerulea violacea
Puya: raimondii Pycnostachys
Pyramidal Bugleweed 'Metallica Crispa' Pyrenean Cranesbill 'Wargrave Pink'
Pyrethrum (spp.) Pyrethrum 'Painted Daisy'
Pyrethrum 'Robinson Hybrids' Pyrethrum 'Robinson's Mix'
Pyrethrum 'Robinson's Red' Pyrolla, Pink
'Quadricolor' Wandering Jew: zebrina Quaker Ladies
Quamash 'Coerulea' Quamash, Cusick
'Queen Alexander' Oriental Poppy 'Queen Josephine' Hosta
Queen Lily Ginger (spp.) Queen Lily Ginger 'Emperor'
'Queen of Night' Hybrid Tulip 'Queen of Siam' Chinese Evergreen
Queen of the Alps (spp.) Queen of the Meadows 'Plena'
Queen of the Meadows Variegated Queen of the Night
Queen of the Prairie (spp.) Queen Victoria Century Plant
Queen's Spiderwort Queensland
'Queeny Purple' Hollyhock 'Quilled Petals Mix' Black-eyed Susan
'Quills' Sweet Coneflower Quiver Tree
Rabassam Rabbit Tracks (spp.)
Rabbit Tracks 'Herringbone Plant' Rabbit's Foot
Rabbit's Foot Fern 'Rachels Gold' Garden Sage
'Radiant Edger' Hosta Radicchio (spp.)
Radicchio 'Marina' Ragged Orchid
'Ragin Cajin' Red Ruellia Ragwort (spp.)
Ragwort 'Desdemona' Ragwort 'Othello'
Railroad Vine Rain Lily
Rain Lily: candida Rainbow Plant (spp.)
Rainbow Plant 'Chameleon' 'Rainbow River' Flax
Rainbow Rockcress (spp.) Rainbow Rockcress 'Snow Cap'
Rainbow Rockcress 'Whitewell Gem' 'Rainbow Sunrise (Maori Queen)' New Zealand Flax
'Rainforest' Orchid 'Ramie' Ramie
Ramie (spp.) Ramie 'Ramie'
'Ramona' Hybrid Clematis 'Rana' Guzmania
Rancheria Grass (spp.) Rancheria Grass Blue
Raoulia Raoulia 'Greenstone'
Raoulia: haastii 'Rare Treat' Tall Bearded German Iris
'Raspberry Cooler' Madagascar Periwinkle 'Raspberry Ice' Alumroot: Heuchera
'Raspberry Ice' Lungwort: hybrid 'Raspberry Pixie' Daylily
'Raspberry Queen' Oriental Poppy 'Raspberry Regal' Alumroot: micrantha
'Raspberry Ripple' Mullein 'Raspberry Splash' Lungwort: hybrid
'Raspberry Wine' Bee Balm: Monarda Rat's Tail Babiana
Rattlesnake Fern Rattlesnake Master
'Raven' Peacock Ginger Ravenna Grass
'RavensWing' Chervil 'Razzamatazz' Daylily
'Read's Blue' Blue Marguerite