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P - R
Common names to Botanical names - P to R• A to Br • Bu to C • D to Go • Gr to J • K to O • P to R • S • T to Z
| Pachysandra | Pachysandra | terminalis |
| Pacific crab apple | Malus | fusca |
| Pacific crab apple | Pyrus | fusca: |
| Pacific ninebark | Physocarpus | capitatus |
| Pacific rhododendron | Rhododendron | macrophyllum |
| Pacific willow | Salix | lasiandra: |
| Pacific willow | Salix | lucida ssp. lasiandra |
| Paddy River Box | Eucalyptus | mac-arthurii |
| Paeony | Paeonia | |
| Paeony | Paeonia | officinalis |
| Pagoda tree | Sophora | japonica |
| Pagoda tree | Styphnolobium | japonicum: |
| Paisley Flower | Salpiglossis | sinuata |
| Pajaro Bobo | Ipomoea | murucoides: |
| Pak Choi (Cantonese) | Brassica | chinensis |
| Pale Catechu | Catechu | pallidum |
| Pale Catechu | Uncaria | gambir |
| Pale Indian Plantain | Cacalia | atriplicifolia |
| Pale Jewelweed | Impatiens | aurea |
| Pale Purple Coneflower | Echinacea | pallida |
| Pale Yellow Mullein | Verbascum | phlomoides |
| Palmetto | Sabal | |
| Palo Verde | Cercidium | |
| Panic Grass | Panicum | violaceum |
| Panther Lily | Lilium | canadense |
| Papaloquelite | Porophyllum | ruderale ssp.macrocepha |
| Papaya | Carica | |
| Papaya | Carica | papaya |
| Papaya | Carica | papaya 'Hawaii Dark Pink' |
| Papaya | Carica | papaya 'Solo' |
| Paper Birch | Betula | papyrifera |
| Paper Mulberry | Broussonetia | |
| Paper Mulberry | Broussonetia | papyrifera |
| Paperbark Maple | Acer | griseum |
| Papyrus | Cyperus | papyrus |
| Para Rhatany | Krameria | argentea |
| Para Rubber | Hevea | .. |
| Paraguay Tea | Ilex | paraguariensis |
| Pareira | Chondrodendron | tomentosum |
| Parma violet | Viola | alba |
| Parrot's Bill | Clianthus | puniceus |
| Parsley | Petroselinum | crispum |
| Parsley Piert | Alchemilla | arvensis |
| Parsnip | Pastinaca | sativa |
| Parsnip Chervil | Chaerophyllum | bulbosum |
| Partridge-breasted Aloe | Aloë | variegata |
| Pasque Flower | Anemone | patens |
| Pasque Flower | Pulsatilla | vulgaris |
| Pasque Flower | Pulsatilla | vulgaris 'Mixed colors' |
| Passion Flower | Passiflora | |
| Passion Fruit | Passiflora | edulis |
| Patchouli | Pogostemon | |
| Patchouli | Pogostemon | cablin |
| Patchouli | Pogostemon | patchouli: |
| Pau d'arco | Tabebuia | impetiginosa |
| Pea Tree | Caragana | |
| Peach | Prunus | persica |
| Peach tree | Amygdalus | persica: |
| Peach tree | Persica | platycarpa: |
| Peach tree | Persica | vulgaris: |
| Peach-leaved Bellflower | Campanula | persicifolia |
| Peacock Ginger | Kaempferia | roscoeana |
| Peanut | Arachis | hypogaea |
| Peanut Cactus | Chamaecereus | silvestrii |
| Pear | Pyrus | communis |
| Pear Lemon | Citrus | limetta: |
| Pearl Everlasting | Anaphalis | margaritaceae var. yedoens |
| Pearl Everlasting | Anaphalis | nubigena |
| Pearl Everlasting | Anaphalis | triplinervis |
| Pearl Lemon | Citrus | margarita |
| Pearlflowered Life Everla | Antennaria | margaritaceum |
| Pearlwort | Sagina | |
| Pearly Everlasting | Anaphalis | margaritacea |
| Pears | Pyrus | |
| Peas | Pisum | sativum |
| Peavine | Lathyrus | |
| Pelargonium | Pelargonium | antidysentericum |
| Pelargoniums | Pelargonium | triste |
| Pellitory | Anacyclus | pyrethrum |
| Pellitory of The Wall | Parietaria | officinalis |
| Pellucoid-leaved Pepper | Piper | pellucidum |
| Pennsylvania Sedge | Carex | pennsylvanica |
| Pennycress | Thlaspi | arvense |
| Pennyroyal | Mentha | pulegium |
| Pennywort | Umbilicus | rupestris |
| Peppergrass | Lepidium | ruderale |
| Peppermint | Mentha | x piperita |
| Peppermint | Mentha | x piperita var. vulgaris |
| Peppermint Eucalyptus | Eucalyptus | nicholii |
| Peppermint Eucalyptus | Eucalyptus | radiata |
| Peppermint Geranium | Pelargonium | tomentosum |
| Peppermint Gum | Eucalyptus | dives |
| Peppermint Stringybark | Eucalyptus | piperita |
| Peppermint Willow Myrtle | Agonis | flexuosa |
| Pepperroot | Dentaria | laciniata |
| Peppers | Capsicum | annuum |
| Père David's Maple | Acer | davidii |
| Perennial Hollyhock | Alcea | ficifolia |
| Perennial Honesty | Lunaria | rediviva |
| Perennial Pea | Lathyrus | latifolius |
| Perennial Quaking Grass | Briza | media |
| Perennial Snapdragon | Linaria | purpurea |
| Perezii Statice | Limonium | perezii |
| Perfume Acacia | Acacia | farnesiana |
| Peri Peri | Cyperus | corymbosus |
| Periwinkle | Vinca | |
| Pernambuco Jaborandi | Pilocarpus | pennatifolius |
| Persian Pellitory | Chrysanthemum | carneum |
| Persian Pellitory | Chrysanthemum | roseum |
| Persian Pellitory | Tanacetum | coccineum |
| Persian Tobacco | Nicotiana | persica |
| Persian Zatar | Satureja | thymbra |
| Peruvian Bark | Cinchona | succirubra |
| Peruvian Basil | Ocimum | micranthemum |
| Peruvian Lily | Alstroemeria | |
| Peruvian Lily | Alstroemeria | aurea |
| Peruvian Lily | Alstroemeria | haemantha |
| Peruvian Lily | Alstroemeria | ligtu |
| Peruvian Lily | Alstroemeria | ligtu x haemantha |
| Peruvian Sage | Salvia | discolor |
| Pestle Lomatium | Lomatium | nudicaule |
| Pheasant's eye | Adonis | aestivalis |
| Pheasant's eye | Adonis | vernalis |
| Pichi | Fabiana | imbricata |
| Pig Squeak | Bergenia | purpurascens |
| Pigmy Sunflower | Actinella | grandiflora |
| Pig-nut | Conopodium | majus |
| Pig's Ears | Cotyledon | |
| Pill-bearing Spurge | Euphorbia | pilulifera |
| Pimpernel | Anagallis | |
| Pin Cherry | Prunus | pensylvanica |
| Pin Oak | Quercus | palustris |
| pincushion | Chaenactis | |
| Pine Apple | Bromelia | ananas: |
| Pine Geranium | Pelargonium | denticulatum |
| Pine Rosemary | Rosmarinus | angustifolia |
| Pineapple | Ananas | comosus |
| Pineapple Guava | Acca | selloviana |
| Pineapple Guava | Feijoa | |
| Pineapple Guava | Feijoa | sellowiana |
| Pineapple Mint | Mentha | citrata: |
| Pineapple Mint | Mentha | suaveolens |
| Pineapple Mint | Mentha | suaveolens 'Variegata' |
| Pineapple Sage | Salvia | elegans |
| Pineapple Sage | Salvia | rutilans |
| Pineapple Weed | Matricaria | matricarioides |
| Pinemat manzanita | Arctostaphylos | nevadensis |
| pines | Pinus | |
| Pink | Dianthus | |
| Pink And White Shower | Cassia | nodosa |
| Pink Baby's Breath | Gypsophila | pacifica |
| Pink Banana Passionfruit | Passiflora | mollissima |
| Pink Bear's Tail | Celsia | roripifolia |
| Pink Burning Bush | Dictamnus | albus var. rubra |
| Pink fawn lily | Erythronium | revolutum |
| Pink Gayfeather | Liatris | aspera |
| Pink Horse Chestnut | Aesculus | x carnea |
| Pink Japanese Anemone | Anemone | elegans |
| Pink Knapweed | Centaurea | pulcherrima |
| Pink Mallow | Malva | alcea |
| Pink mountain-heather | Phyllodoce | empetriformis |
| Pink Peppercorns | Schinus | |
| Pink Root | Spigelia | marylandica |
| Pink Shower | Cassia | grandis |
| Pipe-vine | Aristolochia | sipho |
| Pipissewa | Chimaphila | umbellata |
| Pipissewa | Chimophila | umbellata |
| Pipsissewa | Chimaphila | |
| Pistachio | Pistacia | vera |
| Pistolochia | Aristolochia | pistolochia |
| Pitcher Plant | Sarracenia | purpurea |
| Pitcher Sage | Salvia | spathacea |
| Plainleaf Parsley | Petroselinum | crispum var. neapolitanum |
| Plantain Lily | Funkia | sp.: |
| Plantain Lily | Hosta | |
| Pleurisy root | Asclepias | tuberosa |
| Ploughman's Spikenard | Inula | conyza |
| Plumbago | Ceratostigma | plumbaginoides |
| Plumbago | Ceratostigma | willmottianum |
| Plumbago | Plumbago | europaea |
| Plume Poppy | Macleaya | arborea |
| Plume Poppy | Macleaya | cordata |
| Plume Poppy | Macleaya | frutescens |
| Plume Poppy | Macleaya | integrifolia |
| Plumed cockscomb | Celosia | plumosa |
| Poached Egg Daisy | Myriocephalus | stuartii |
| Pocket-handkerchief Tree | Davidia | involucrata |
| Poele Bark | Alstonia | spectabilis |
| Poet's Narcissus | Narcissus | poeticus |
| Poinsettia | Euphorbia | pulcherrima |
| poison hemlock | Cicuta | douglasii |
| Poison Hemlock | Conium | maculatum |
| Poison Ivy | Rhus | toxicodendron |
| Poke Root | Phytolacca | americana |
| Pole Bean | Phaseolus | vulgaris var. vulgaris |
| Polyheaded Sunflower | Helianthus | debilis |
| Pomegranate | Punica | |
| Pomegranate | Punica | granatum |
| Pontic dragonhead | Dracocephalum | austriacum |
| Pony Bee Balm | Monarda | pectinata |
| Pony Tail | Nolina | recurvata |
| Popcorn Senna | Cassia | didymobotra |
| Poplar | Populus | |
| Poppy Anemone | Anemone | coronaria |
| Poppy Mallow | Callirhoe | triangulata |
| Portia Tree | Thespesia | populnea |
| Portland Arrowroot | Arum | maculatum |
| Portugal Laurel | Prunus | lusitanica |
| Portuguese Broom | Cytisus | albus |
| Portuguese Heath | Erica | lusitanica |
| Poscharsky's Bellflower | Campanula | poscharskyana |
| Possum Haw | Ilex | decidua |
| Pot Marigold | Calendula | officinalis |
| Pot Marjoram | Origanum | onites |
| Potato | Solanum | tuberosum |
| Potato Onion | Allium | cepa var. aggregatum |
| Powdered Primrose | Primula | pulverulenta |
| Prairie Apple | Psoralea | esculenta |
| Prairie Aster | Machaeranthera | tanacetifolia |
| Prairie Bergamot | Monarda | citriodora |
| Prairie Brome | Bromus | unioloides |
| Prairie Buttercup | Ranunculus | rhomboideus |
| Prairie Clover | Petalostemun | |
| Prairie Coneflower | Ratibida | |
| Prairie Coneflower | Ratibida | pinnata |
| Prairie Cordgrass | Spartina | pectinata |
| Prairie Dock | Silphium | terebinthinaceum |
| Prairie Dropseed | Sporobolus | heterolepis |
| Prairie Flax | Linum | lewisii |
| Prairie Flax | Linum | perenne subsp. lewisii |
| Prairie Gayfeather | Liatris | scariosa |
| Prairie Larkspur | Delphinium | virescens |
| Prairie Loosestrife | Lysimachia | quadrifolia |
| Prairie Onion | Allium | stellatum |
| Prairie Senna | Cassia | chamoecrista |
| Prairie Smoke | Geum | triflorum |
| Prickly Ash | Zanthoxylum | americanum |
| Prickly Ash | Zanthoxylum | clava-herculis |
| Prickly Box | Bursaria | |
| Prickly Cedar | Juniperus | oxycedrus |
| Prickly Comfrey | Symphytum | asperum |
| Prickly Elder | Aralia | spinosa |
| Prickly Glasswort | Salsola | kali |
| Prickly Lettuce | Lactuca | serriola |
| Prickly moses | Acacia | verticillata |
| Prickly Pear | Opuntia | humifusa |
| Prickly Pear | Opuntia | vulgaris |
| Prickly Pear Cactus | Opuntia | compressa |
| Prickly Pear Cactus | Opuntia | phaecantha var. major |
| Prickly Pears | Opuntia | |
| Prickly Poppy | Argemone | mexicana |
| Prickly Whorlflower | Morina | persica |
| Pricklytoothed Shield Fer | Dryopteris | spinulosa |
| Pride of Barbados | Poinciana | pulcherrima |
| Pride of De Kaap | Bauhinia | galpinii |
| Primrose | Primula | |
| Primrose | Primula | vulgaris |
| Prince of Orange Geranium | Pelargonium | citrosum |
| Prince Rupert Geranium | Pelargonium | crispum 'Prince Rupert' |
| Prince's Feather | Amaranthus | cruentus |
| Prince's Plume | Polygonum | orientale |
| Privet | Ligustrum | |
| Procumbent Speedwell | Veronica | agrestis |
| Prophet Flower | Arnebia | echioides |
| Provence Lavender | Lavandula | x intermedia |
| Prunella Loveliness | Prunella | grandiflora |
| Prunes | Prunus | domestica |
| Psyllium Plantain | Plantago | afra |
| Pumpkin | Cucurbita | pepo |
| Purging Cassia | Cassia | fistula |
| Purple Angel's Trumpet | Datura | metel flora pleno |
| Purple Bell Vine | Rhodochiton | atrosanguineum |
| Purple Boneset | Eupatorium | |
| Purple Common Perilla | Perilla | frutescens 'Nankinensis' |
| Purple Coneflower | Echinacea | purpurea |
| Purple Deadnettle | Lamium | purpureum |
| Purple Garden Sage | Salvia | officinalis 'Purpurascens' |
| Purple Gentian | Gentiana | purpurea |
| Purple Heliconia | Heliconia | bourgaeana |
| Purple Laburnum | Cytisus | purpurascens |
| Purple Loosestrife | Lythrum | salicaria |
| Purple Molinia | Molinia | varia |
| Purple Orchid Tree | Bauhinia | purpurea |
| Purple Prairie Clover | Petalostemun | purpureum |
| Purple Prunella | Prunella | Webbiana |
| Purple Rock Cress | Aubrieta | |
| Purple Sage | Salvia | officinalis 'Purpurea' |
| Purple silkweed | Asclepias | syriaca |
| Purple Stramonium | Datura | tatula |
| Purple Turk's Cap Lily | Lilium | martagon |
| Purple-blue Gayfeather | Liatris | ligulistylis |
| Purpleleaf Sand Cherry | Prunus | x cistena |
| Purple-leaved Cootamunda | Acacia | baileyana var. purpurea |
| Purplenet Toadflax | Linaria | reticulata |
| Pussy-toes | Antennaria | neglecta |
| Pyrethrum | Chrysanthemum | cinerariifolium |
| Quail Grass | Celosia | argentea |
| Quaking Aspen | Populus | tremuloides |
| Quaking Grass | Briza | maxima |
| Quaking Grass | Briza | minor |
| Quassia | Picraena | excelsa |
| Quassia | Picrasma | excelsa |
| Quebracho | Aspidosperma | quebracho-blanco |
| Quebracho Flojo | Iodina | rhombifolia |
| Quebracho Wood | Schinopsis | lorenzii |
| Queen Anne's Thimbles | Gilia | capitata |
| Queen of The Prairie | Filipendula | rubra |
| Queen's cup | Clintonia | uniflora |
| Queen's Delight | Stillinga | sylvatica |
| Queen's Tears USA | Billbergia | nutans |
| Queensland wattle | Acacia | podalyriifolia |
| Quercitron Bark | Quercus | tinctoria |
| Quince | Cydonia | oblonga |
| Quinine Flower | Sabatia | elliottii |
| Quinoa | Chenopodium | quinoa |
| Quinsy-wort | Asperula | cynanchica |
| Radish | Raphanus | sativus |
| Raffia Palm | Raphia | farinifera |
| Ragwort | Senecio | jacobaea |
| Ragwort | Senecio | triangularis |
| Rampion | Campanula | rapunculus |
| Ramsons | Allium | ursinum |
| Rangoon creeper | Quisqualis | grandiflora: |
| Rangoon creeper | Quisqualis | indica |
| Rangoon creeper | Quisqualis | longifolia: |
| Rangoon creeper | Quisqualis | loureiri: |
| Rangoon creeper | Quisqualis | pubescens |
| Rangoon creeper | Quisqualis | sinensis: |
| Rape | Brassica | napus |
| Rape | Brassica | napus subsp. oleifera |
| Raspberry | Rubus | cariensis |
| Raspberry | Rubus | idaeus |
| raspberry | Rubus | strigosus |
| Raspberry (Scottish) | Rubus | mucronotoides |
| Raspberry Jam Wood | Acacia | acuminata |
| Rattle Box | Crotalaria | |
| Rattlesnake Grass | Briza | |
| Rattlesnake Master | Eryngium | yuccifolium |
| Rattlesnake Master | Liatris | squarrosa |
| Rattlesnake Plantain | Peramium | ripens |
| Rattlesnake-plantain | Goodyera | oblongifolia |
| Rauwolfia | Rauvolfia | serpentina |
| Red alder | Alnus | rubra |
| Red American Osier | Cornus | amomum |
| Red Astrachan Apple | Pyrus | malus var. astracanica: |
| Red Bartsia | Bartsia | odontites |
| Red Beet | Beta | vulgaris var. conditiva |
| Red bidi-bidi | Acaena | novae-zealandiae |
| Red Box | Eucalyptus | polyanthemos |
| Red Buckeye | Aesculus | pavia |
| Red Cedar | Thuja | plicata |
| Red Clover | Trifolium | pratense |
| Red Comfrey | Symphytum | rubrum |
| Red Currant | Ribes | rubrum |
| Red Dock | Rumex | aquaticus |
| Red elderberry | Sambucus | racemosa ssp. pubens |
| Red Flowered Mallee | Eucalyptus | erythronema |
| Red Ginger | Alpinia | purpurata |
| Red Goosefoot | Chenopodium | rubrum |
| Red huckleberry | Vaccinium | parvifolium |
| Red Ironbark | Eucalyptus | sideroxylon |
| Red Jewelweed | Impatiens | glandulifera |
| Red Knotweed | Polygonum | macrophyllum |
| Red Leaved Hibiscus | Hibiscus | acetosella |
| Red Lobelia | Lobelia | cardinalis |
| Red Maple | Acer | rubrum |
| Red masterwort | Astrantia | carniolica |
| Red Mexican Hat | Rabitida | columnifera var. pulcherrima |
| Red Mulberry | Morus | rubra |
| Red Orach | Atriplex | hortensis 'Red' |
| Red Passionflower | Passiflora | cinnabarina |
| Red Pine Cone Ginger | Zingiber | fairchildii |
| Red Poppy | Papaver | rhoeas |
| Red Provins Rose | Rosa | gallica |
| Red Raripila | Mentha | x smithiana |
| Red Root | Ceanothus | americanus |
| Red Saunders | Pterocarpus | santalinus |
| Red Silk Cotton Tree | Bombax | malabaricum |
| Red Silver Fir | Abies | amabilis |
| Red swamp currant | Ribes | triste |
| Red Valerian | Centranthus | ruber |
| Red Yucca | Hesperaloe | parviflora |
| Red-barked Dogwood | Cornus | alba |
| Red-berried American Eld | Sambucus | melanocarpa |
| Red-berried American Eld | Sambucus | rubens |
| Red-berried Elder | Sambucus | racemosa |
| Redbud | Cercis | |
| Red-flowering currant | Ribes | sanguineum |
| Red-osier dogwood | Cornus | stolonifera |
| Red-spur Valerian | Kentranthus | ruber |
| Redstem | Acacia | rubida |
| Redstem ceanothus | Ceanothus | sanguineus |
| Red-tip Bay | Persea | borbonia |
| Red-topped Sage | Salvia | viridis |
| Red-veined Dock | Rumex | sanguineus var. sanguineus |
| Reed Canary Grass | Phalaris | arundinacea |
| Reed grass | Phragmites | communis |
| Reed Manna-grass | Glyceria | aquatica |
| Rehmannia | Rehmannia | glutinosa |
| Reishi Mushroom | Ganoderma | lucidum |
| Restharrow | Ononis | spinosa |
| Rest-harrow | Ononis | arvensis |
| Retamilia | Caesalpinia | mexicana |
| Rhatany | Krameria | triandra |
| Rhodanthe | Helipterum | manglesii |
| Rhododendron | Rhododendron | |
| Rhubarb | Rheum | rhabarbarum |
| Ribwort Plantain | Plantago | lanceolata |
| Rice Bean | Vigna | umbellata |
| Rice-grass | Oryzopsis | |
| Rice-paper tree | Aralia | papyrifera: |
| Rice-paper tree | Fatsia | papyrifera: |
| Rice-paper tree | Tetrapanax | papyrifera |
| Ridged Bromegrass | Bromus | sterilis |
| River Birch | Betula | nigra |
| River Red Gum | Eucalyptus | camaldulensis |
| River She-oak | Casuarina | cunninghamiana |
| Riverside Vine | Vitis | riparia |
| Rober's Lemon Rose Gerani | Pelargonium | graveolens 'Rober's Lemon Rose' |
| Rock Cress | Arabis | |
| Rock Purslane | Calandrinia | umbellata |
| Rock Rose | Cistus | |
| Rock Rose | Cistus | ladaniferus |
| Rock Rose | Cistus | x pulverulentus |
| Rock Rose | Cistus | x purpureus |
| Rock Rose | Helianthemum | nummularium mutabile |
| Rock Samphire | Crithmum | maritimum |
| Rock Soapwort | Saponaria | ocymoides |
| Rock Veronica | Veronica | saxatilis |
| Rocket Sallad | Eruca | sativa |
| Rock-rose | Helianthemum | vulgare |
| Rocky Mountain Beardtongu | Penstemon | strictus |
| Rocky Mountain juniper | Juniperus | scopulorum |
| Rocky Mountain Oregano | Brickellia | veronicifolia |
| Roebuck-berry | Rubus | saxatilis |
| Romaine Lettuce | Lactuca | sativa var. longifolia |
| Roman Chamomile | Anthemis | nobilis |
| Roman Chamomille | Chamaemelum | nobile |
| Roman Wormwood | Artemisia | pontica |
| Rosa Mundi | Rosa | gallica 'Versicolor' |
| Rose | Rosa | |
| Rose Apple | Eugenia | jambos |
| Rose Beauty Everlasting | Helichrysum | cassinianum |
| Rose Campion | Lychnis | coronaria |
| Rose De Mai | Rosa | gallica x centifolia |
| Rose Mallow | Hibiscus | |
| Rose of Sharon | Hibiscus | chinensis: |
| Rose of Sharon | Hibiscus | rhombifolius: |
| Rose of Sharon | Hibiscus | syriacus |
| Rose Root | Rhodiola | rosea |
| Rose Verbena | Verbena | canadensis |
| Rosea Lavender | Lavandula | angustifolia 'Rosea' |
| Rose-flowered Tea Tree | Leptospermum | scoparium |
| Roseleaf Sage | Salvia | involucrata |
| Roselle | Hibiscus | sabdariffa |
| Rosemary | Rosmarinus | |
| Rosemary | Rosmarinus | officinalis |
| Rosemary Santolina | Santolina | rosmarinifolia |
| Rosemary-mint | Poliomintha | longiflora |
| Rosette Pak Choi | Brassica | rapa var. rosularis |
| Rosin Weed | Silphium | ginniferum |
| Rosinweed | Silphium | integrifolium |
| Rosin-weed | Silphium | paciniatum |
| Rosinwood | Chrysopsis | camporum |
| Rosy twistedstalk | Streptopus | roseus |
| Rottnest Is. Pine | Callitris | preissii |
| Rough Hawkbit | Leontodon | hispidus |
| Rough-barked maple | Acer | triflorum |
| Rough-leaved Pepper | Piper | amalago |
| Round cardamom | Amomum | compactum |
| Roundheaded Bushclover | Lespedeza | capitata |
| Round-headed Mud-rush | Scirpus | holoschoeuus |
| Round-leaved Dock | Rumex | obtusifolius |
| Round-leaved Pennycress | Thlaspi | rotundifolium |
| Rowan | Sorbus | aucuparia var. moravica |
| Royal Catchfly | Silene | regia |
| Royal Fern | Osmunda | regalis |
| Royal Lily | Lilium | regale |
| Royal Poinciana | Delonix | regia |
| Rue | Ruta | graveolens |
| Ruffled Red Eggplant | Solanum | integrifolium |
| Runner Beans | Phaseolus | coccineus |
| Rupturewort | Herniaria | glabra |
| Russian Comfrey | Symphytum | x uplandicum |
| Russian Edelweiss | Leontopodium | palibianum |
| Russian False Lupin | Thermopsis | fabacea |
| Russian Globe Thistle | Echinops | exaltatus |
| Russian Henbane | Hyoscyamus | albus |
| Russian Knotgrass | Polygonum | erectum |
| Russian Licorice | Glycyrrhiza | echinata |
| Russian Liquorice | Glycyrrhiza | glandulifera |
| Russian Mallow | Althaea | armeniaca |
| Russian Olive | Elaeagnus | angustifolia |
| Russian Sage | Perovskia | artemisioides |
| Russian Sage | Perovskia | atriplicifolia |
| Russian Sage | Perovskia | atriplicifolia x P.abrotanoides |
| Russian Statice | Limonium | suworowii |
| Russian Tarragon | Artemisia | dracunculus var. inodora |
| Rusty Foxglove | Digitalis | ferruginea |
| rutabaga | Brassica | napobrassica |
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