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Common Names—R
Rabassam Pelargonium sidoides
Radial Narcissus Narcissus radiiflorus
Radish Raphanus sativus
Radish, Black Spanish Raphanus sativus var.
Ragged Fringed Orchid Platanthera lacera
Ragged Robin Lychnis flos-cuculi
Ragweed Ambrosia artemisifolia
Ragweed, Annual Ambrosia artemisifolia
Ragweed, Common Ambrosia artemisifolia
Ragweed, Giant Ambrosia trifida
Ragweed, Peruvian Ambrosia peruviana
Ragwort, Golden Senecio aureus, Packera aurea
Ragwort, Roundleaf Senecio obovatus, Packera obovata
Ragwort, Tall Senecio serra
Ragwort, Tansy Jacobaea vulgaris (Senecio vulgaris)
Railroad Vine Ipomoea pes-caprae
Rain Lily, Evening Cooperia drummondii
Rainbow Eucalyptus Eucaluptus deglupta
Ram's Head Lady's Slipper Cypripedium arietinum
Ramanas Rose Rosa rugosa
Rambler, Rose Rosa multiflora
Ramie Boehmeria nivea
Ramps Allium tricoccum
Ram's Head Lady's Slipper Cypripedium arietinum
Ram's Head Orchid Cypripedium arietinum
Raspberry Rubus idaeus
Raspberry, Black Rubus occidentalis
Raspberry, Purpleflowered Rubus odoratus
Rattan Berchemia scandens
Rattlesnake Fern Botrychium virginianum
Rattlesnake Master Eryngium yuccifolium
Rattlesnake Plantain, Downy Goodyera pubescens
Rattlesnake Root Prenanthes altissima
Rattlesnake Weed Euphorbia albomarginata
Rauwolfia Rauvolfia serpentina
Rauwolfia Rauvolfia vomitoria
Red Balmony Chelone obliqua
Red Baneberry Actaea rubra
Red Bay Persea borbonia
Red Bird-of-Paradise Caesalpinia pulcherrima
Red Buckeye Aesculus pavia
Red Cedar Juniperus virginiana
Red Chinese Rice Monascus purpurea
Red Clover Trifolium pratense
Red Columbine Aquilegia formosa
Red Elderberry Sambucus racemosa
Red Frangipani Plumeria rubra
Red Ginger Alpinia purpurata
Red Hibiscus Hibiscus coccineus
Red Maple Acer rubrum
Red Monkeyflower Mimulus puniceus
Red Mulberry Morus rubra
Red Osier Dogwood Cornus sericea
Red Peony Paeonia lactiflora
Red Sage; Dan-shen Salvia miltiorrhiza
Red Squill Urginea maritima; U. scilla; Scilla maritima
Red Spruce Picea rubens
Red Torch Ginger Etlingera elatior
Red Trillium Trillium sessile
Red Turtlehead Chelone obliqua
Red Yeast Rice Monascus purpureus
Red Yeast Rice, Chinese Monascus purpureus
Redbay Persea borbonia
Redbud Cercis canadensis
Redbud, Western Cercis occidentalis
Reddening Lepiota Lepiota americana or Leucoagaricus americanus
Redroot Pigweed Amaranthus retroflexus
Reed, Paper Cyperus papyrus
Rehmannia Rehmannia glutinosa
Reina de la Noche Epiphyllum oxypetalum
Reishi Mushroom Ganoderma lucidum
Reishi Mushroom, Hemlock Ganoderma tsugae
Restharrow Ononis spinosa
Restharrow, Common Ononis repens
Restharrow, Spiny Ononis spinosa
Resurrection Fern Pleopeltis polypodioides
Rhatany Krameria lanceolata
Rhatany, Texas Krameria lanceolata
Rhattany Krameria lanceolata
Rhodiola Rhodiola rosea
Rhododendron, Greater Rhododendron maximum
Rhubarb Rheum x hybridum
Rhubarb, Garden Rheum x hybridum
Rhubarb, Chinese Rheum officinale
Rhubarb, Chinese Rheum palmatum
Rhubarb, Palmate Rheum palmatum
Rhubarb, Turkey Rheum officinale
Rice Oryza sativa
Rice, Wild Zizania palustris
Richweed Collinsonia canadensis
Rickback Banksia Banksia speciosa
Robert, Herb Geranium robertianum
Robert's Geranium Geranium robertianum
Robin's Fleabane Erigeron pulchellus
Rock Cress, Missouri Arabis misouriensis
Rock Rose Cistus ladanifer
Rock Samphire Crithmum maritinum
Rocket, Dames Hesperis matronalis
Rocket Larkspur Consolida ajacis
Rocket Larkspur Consolida orientalis
Rocket, Yellow Barbarea vulgaris
Rocketcress, Green Arabis missouriensis
Rockrose Cistus ladanifer
Rockrose, Crimson Cistus ladanifer
Rocky Mountain Iris Iris missouriensis
Rocky Mountain Zinnia Zinnia grandiflora
Roman Chamomile Chamaemelum nobile
Roman Wormwood Artemisia pontica
Root, Adam and Eve Aplectrum hyemale
Root, Bowman's Porteranthus stipulatus (Gillenia stipulata)
Bowman's Root Porteranthus trifoliatus (Gillenia trifoliata)
Root, Chinese Culver's Veronicastrum sibericum
Root, Culver's Veronicastrum virginicum
Root, Gully Petiveria alliacea
Root, Putty Aplectrum hyemale
Root, Rattlesnake Prenanthes altissima
Root, Siberian Culver's Veronicastrum sibericum
Root, Skunk Petiveria alliacea
Rosa mundi Rosa gallica
Rosary Pea Abrus precatorius
Rose Rosa gallica
Rose Rosa spp.
Rose, Apothecary Rosa gallica
Rose, Baby Rosa multiflora
Rose, Bramble Rosa multiflora
Rose, Carolina Rosa carolina
Rose, Cherokee Rosa laevigata
Rose, Climbing Rosa setigera
Rose, Christmas Helleborus orientalis
Rose, Dog (in flower and fruit)

Rosa canina

Rose, Florists Rosa spp.
Rose, French Rosa canina
Rose Gentian Sabatia angularis
Rose Hips Rosa canina
Rose, Japanese Rosa rugosa
Rose, Kartoffel Rosa rugosa
Rose, Lenten Helleborus orientalis
Rose-Mallow Hibiscus moscheutos
Rose, Multiflora Rosa multiflora
Rose Pogonia Pogonia ophioglossoides
Rose, Prairie Rosa setigera
Rose, Ramanas Rosa rugosa
Rose, Rambler Rosa multiflora
Rose, Rock Cistus ladanifer
Rose, Rugose Rosa rugosa
Rose, Turkestan Rosa rugosa
Rose-Acacia Robinia hispida
Rose-Campion Lychnis coronaria
Rose-Locust Robinia hispida
Rose-Periwinkle Catharanthus roseus
Rose-Pink Sabatia angularis
Rose-Pogonia Pogonia ophioglossoides
Rose-Verbena Glandularia canadensis, Verbena canadensis
Rose-Vervain Glandularia canadensis, Verbena canadensis
Rose-Yarrow Achillea millefolium 'Rosea'
Rose-of-Sharon Hibiscus rosa-sinensis
Rose-of-Sharon Hibiscus syriacus
Roselle Hibiscus sabdariffa
Rosehips Rosa canina
Rosemallow, Scarlet Hibiscus coccineus
Rosemary Rosmarinus officinalis
Rosemary, Bog Andromeda polifolia (A. glaucophylla)
Rosemary, Wild American Trichostema lantanum
Rosepink Sabatia angularis
Rosier du Japon Rosa rugosa
Rosinweed Silphium terebinthinaceum
Rosinweed, Prairie Silphium terebinthinaceum
Rough Blazing Star Liatris aspera
Rough Cocklebur Xanthium strumarium
Rough Coneflower Rudbeckia grandiflora
Round-leaf Campanula; Bellflower Campanula rotundifolia
Round-leaved Ragwort Senecio obovatus, Packera obovata
Round-leaved Sundew Drosera rotundifolia
Round-lobed Hepatica Hepatica americana
Round-lobed Liverleaf Hepatica americana
Roundseed St. John's Wort Hypericum spharocarpum
Royal Fern Osmunda regalis
Royal Jelly Royal Jelly
Royen's Tree Cactus Pilosocereus royenii (Cephalocerus royenii) 
Ru-Xiang Boswellia sacra
Ru-Xiang-Shu Boswellia sacra
Rubber Tree Ficus elastica
Rubber-tree, Hardy Eucommia ulmoides
Ruda Ruta chalepensis
Rue Ruta graveolens
Rue, Fringed Ruta chalepensis
Rue, Goat's Galega officinalis
Rue, Goat's Tephrosia virginiana
Rue Anemone Thalictrum thalictroides
Rue Anemone, False Enemion biternatum
Ruellia Ruellia humilis
Rugosa Rose Rosa rugosa
Rusby's Milkweed Asclepias rusbyi
Rush Juncus effusus
Rush, Braun's Scouring Equisetum laevigatum
Rush, Scouring Equisetum hyemale
Rush, Soft Juncus effusus
Russel's Beebalm Monarda russeliana
Russian Thistle Salsola iberica
Russian Wormwood Artemisia gmelinii
Rusty Foxglove Digitalis ferruginea
Ryania Ryania speciosa
Rye Secale cereale