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| Common Names—O |
| Common Name |
Scientific Name |
| Radial Narcissus |
Narcissus radiiflorus |
| Radish |
Raphanus sativus |
| Radish, Black Spanish |
Raphanus sativus var. |
| Ragged Fringed Orchid |
Platanthera lacera |
| Ragweed |
Ambrosia artemisifolia |
| Ragweed, Giant |
Ambrosia trifida |
| Railroad Vine |
Ipomoea pes-caprae |
| Rainbow Eucalyptus |
Eucaluptus deglupta |
| Ram's Head Lady's Slipper |
Cypripedium arietinum |
| Ramie |
Boehmeria nivea |
| Ramps |
Allium tricoccum |
| Raspberry |
Rubus idaeus |
| Rattlesnake Master |
Eryngium yuccifolium |
| Rattlesnake Root |
Prenanthes altissima |
| Rattlesnake Weed |
Euphorbia albomarginata |
| Rauwolfia |
Rauvolfia serpentina |
| Red Baneberry |
Actaea rubra |
| Red Buckeye |
Aesculus pavia |
| Red Cedar |
Juniperus virginiana |
| Red Chinese Rice |
Monascus purpurea |
| Red Clover |
Trifolium pratense |
| Red Hibiscus |
Hibiscus coccineus |
| Red Maple |
Acer rubrum |
| Red Monkeyflower |
Mimulus puniceus |
| Red Mulberry |
Morus rubra |
| Red Osier Dogwood |
Cornus sericea |
| Red Sage; Dan-shen |
Salvia miltiorrhiza |
| Red Spruce |
Picea rubens |
| Red Trillium |
Trillium Sessile |
| Redbud |
Cercis canadensis |
| Redbud, Western |
Cercis occidentalis |
| Redroot Pigweed |
Amaranthus retroflexus |
| Redwood |
Sequoia spp. |
| Rehmannia |
Rehmannia glutinosa |
| Reishi Mushroom |
Ganoderma lucidum |
| Reishi Mushroom, Hemlock |
Ganoderma lucidum |
| Rhattany |
Krameria lanceolata |
| Rhubarb, Chinese |
Rheum officinale |
| Rhubarb, Palmate |
Rheum palmatum |
| Rice |
Oryza sativa |
| Rickback Banksia |
Banksia speciosa |
| Rock Cress, Missouri |
Arabis misouriensis |
| Rock Rose |
Cistus labdanum |
| Rocky Mountain Iris |
Iris missouriensis |
| Roman Wormwood |
Artemisia pontica |
| Rose |
Rosa spp. |
| Rose, Apothecary |
Rosa gallica |
| Rose, Arkansas |
Rosa arkansana |
| Rose, Dog |
Rosa canina |
| Rose, Rugose |
Rosa rugosa |
| Rose Campion |
Lychnis coronaria |
| Rose geranium |
Pelargonium roseum |
| Rose Pink |
Sabatia angularis |
| Rose Pogonia |
Pogonia ophioglossoides |
| Rose Verbena |
Verbena canadensis |
| Rose Vervain |
Verbena canadensis |
| Rose Yarrow (see yarrow) |
See under Achillea millefolium |
| Rose-of-Sharon |
Hibiscus syriacus |
| Roselle |
Hibiscus sabdariffa |
| Rosemary |
Rosmarinus officinalis |
| Rough Blazing Star |
Liatris aspera |
| Round-leaf Campanula; Bellflower |
Campanula rotundifolia |
| Round-leaved Ragwort |
Senecio obovatus |
| Royal Jelly |
Royal Jelly |
| Rubber Tree |
Ficus elastica |
| Rue |
Ruta graveolens |
| Rue Anemone |
Anemonella thalictroides |
| Ruellia |
Ruellia humilis |
| Rugosa Rose |
Rosa rugosa |
| Rusby's Milkweed |
Asclepias rusbyi |
| Rush |
Juncus effusus |
| Russian Comfrey |
Symphytum x uplandicum |
| Russian Olive |
Elaeagnus angustifolia |
| Russian Thistle |
Salsola iberica |
| Ryania |
Ryania speciosa |
| Rye |
Secale cereale |
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