Ragweed, Common Ambrosia artemisiifolia No Obvious Symmetry
Ragweed, Giant (see Ragweed, Great/ Giant Ragweed)
Ragweed, Great/ Giant Ragweed Ambrosia trifida No Obvious Symmetry
Ragwort, Golden/ Squaw-Weed Senecio aureus Sunflower-Like
Raisin, wild (see Nannyberry)
Ramps (see Leek, Wild/ Ramps)
Raspberry, Black Rubus occidentalis Rose
Raspberry, Flowering (see Raspberry, Purple-Flowering)
Raspberry, Purple-Flowering Rubus odoratus Rose
Rattlesnake Root (see Lettuce, Tall White/ Rattlesnake Root)
Rattlesnake-Weed Hieracium venosum Dandelion-Like
Red fruited pyxie cup lichen Cladonia pleurota Lichen
Red fruited pyzie cup lichen Cladonia pleurota Lichen
Red gilled cort Cortinarius semisanguineus Gilled Mushrooms
Redgum (see Sweetgum)
Redleg (see Lady's-Thumb/ Redleg)
Rhododendron, Great/ Great Laurel Rhododendron maximum Heath
Rimosus decay (see Polypore, cracked-cap)
Rock Cress, Lyre-Leaved Arabis lyrata Dandelion-Like
Rock tripe, smooth Umbilicaria mammulata Lichen
Root rot, armillaria Armillaria gallica Gilled Mushrooms
Rose of Sharon Hibiscus syriacus Mallow
Rose, Memorial Rosa wichuraiana Rose
Rose, Multiflora Rosa multiflora Rose
Rose, Pasture Rosa carolina Rose
Rose, Swamp Rosa palustris Rose
Rose-Mallow, Crimson-Eyed Hibiscus palustris, forma peckii Mallow
Rose-Mallow, Swamp Hibiscus palustris Mallow
Rosinweed, Whorled Silphium trifoliatum Sunflower-Like
Rough speckled shield lichen Punctelia rudecta Lichen
Rough-speckled shield lichen Punctella rudecta Lichen
Ruddy panus (see Hairy panus)
Rue-Anemone/ Windflower Anemonella thalictroides Buttercup
Rush, Common Juncus effusus Rush
Rush, scouring Equisitum hyemale Horsetail
Rush, thread Juncus filiformis Rush
Russet toughshank (see Collybia, oak-loving)
Agrimonia griposepala
Agrimonia parviflora
Geum virginianum
Geum canadense
Rubus allegheniensis
Gillenia trifoliata
Prunus serotina
Prunus avium
Prunus virginiana
Potentilla simplex
Potentilla canadensis
Potentilla norvegica
Potentilla recta
Potentilla fruticosa
Malus coronaria
Rubus hispidus
Rubus flagellaris
Aruncus dioicus
Crataegus
Spiraea latifolia
Spiraea alba
Physocarpus opulifolius
Rubus occidentalis
Rubus odoratus
Rosa wichuraiana
Rosa multiflora
Rosa carolina
Rosa palustris
Amelanchier arborea
Spirea tomentosa
Duchesnia indica
Fragaria virginiana
Fragaria vesca
Juncus effusus
Juncus filiformis