Ribes rubrum
Red Currant
Ribes sanguineum
Flowering Currant
Ribes uva-crispa
Gooseberry
Riccia beyrichiana
Purple Crystalwort
Riccia flutians
Floating Crystalwort
Riccia nigrella
Black Crystalwort
Riccia subbifurca
Least Crystalwort
Ricinus communis
Castor-oil-plant
Rivini humilis
Bloodberry
Robinia pseudoacacia
False-acacia
Romulea columnae
Sand Crocus
Rorippa islandica
Northern Yellow-cress
Rorippa palustris
Marsh Yellow-cress
Rorippa sylvestris
Creeping Yellow-cress
Rosa arvensis
Field-rose
Rosa caesia
Hairy Dog-rose
Rosa canina
Dog-rose
Rosa canina agg
Dog-rose
Rosa multiflora
Many-flowered Rose
Rosa rubiginosa
Sweet-briar
Rosa rugosa
Japanese Rose
Rosa sherardii
Sherard's Downy-rose
Rosa sp.
Rosa spinosissima
Burnet Rose
Rosa stylosa
Short-styled Field-rose
Rose, Albertine
Albertine Rose
Rosmarinus officinalis
Rosemary
Rubia peregrina
Wild Madder
Rubus aquarum
Rubus ariconiensis
Rubus biloensis
Rubus caesius
Dewberry
Rubus dasyphyllus
Rubus fraxinifolius
Mountain Raspberry
Rubus fruticosus agg.
Blackberry
Rubus fuscicortex
Rubus idaeus
Raspberry
Rubus incurvatus
Rubus iscanus
Rubus nemoralis
Rubus nessensis
Rubus ordovicum
Rubus pedemontanus
Rubus saxatilis
Stone Bramble
Rubus scissus
Rubus sp
Rubus spectabilis
Salmonberry
Rubus tricolor
Chinese Bramble
Rubus troiensis
Rubus tuberculatus
Rubus ulmifolius
Elmleaf Blackberry
Rubus vestitus
Ruella simplex
Mexican Petunia
Ruellia simplex
Mexican Petunia
Ruellia tuberosa
Minnieroot
Rumex acetosa
Common Sorrel
Rumex acetosella
Sheep's Sorrel
Rumex confertus
Russian Dock
Rumex crispus
Curled Dock
Rumex cristatus
Greek Dock
Rumex hydrolapathum
Water Dock
Rumex maritimus
Golden Dock
Rumex obtusifolius
Broad-leaved Dock
Rumex palustris
Marsh Dock
Rumex pulcher
Fiddle Dock
Rumex rupestris
Shore Dock
Rumex sanguineus
Wood Dock
Rumex scutatus
French Sorrel
Ruppia maritima
Beaked Tasselweed
Ruscus aculeatus
Butcher's-broom