Ranunculus acris
Meadow Buttercup
Ranunculus aquatilis
Common Water-crowfoot
Ranunculus auricomus
Goldilocks Buttercup
Ranunculus bulbosus
Bulbous Buttercup
Ranunculus peltatus
Pond Water-crowfoot
Ranunculus repens
Creeping Buttercup
Ranunculus sardous
Hairy Buttercup
Ranunculus sceleratus
Celery-leaved Buttercup
Raphanus raphanistrum
Radish
Raphanus sativus
Garden Radish
Reseda lutea
Wild Mignonette
Reseda luteola
Weld
Reynoutria japonica
Japanese Knotweed
Rhinanthus angustifolius
Greater Yellow-rattle
Rhinanthus minor
Yellow-rattle
Rhodiola rosea
Roseroot
Rhododendron loderi
Rhynchospora alba
White Beak-sedge
Rhynchospora fusca
Brown Beak-sedge
Ribes rubrum
Red Currant
Ribes sanguineum
Flowering Currant
Rivini humilis
Bloodberry
Rorippa islandica
Northern Yellow-cress
Rorippa palustris
Marsh Yellow-cress
Rosa canina
Dog-rose
Rosa multiflora
Many-flowered Rose
Rubia peregrina
Wild Madder
Rubus aquarum
Rubus ariconiensis
Rubus biloensis
Rubus caesius
Dewberry
Rubus fruticosus agg.
Rubus iscanus
Rubus nemoralis
Rubus pedemontanus
Rubus saxatilis
Stone Bramble
Rubus scissus
Rubus sp
Rubus troiensis
Rubus tuberculatus
Rubus ulmifolius
Elmleaf Blackberry
Rubus vestitus
Ruella simplex
Mexican Petunia
Ruellia chartaceae
Red Shrimp Plant
Rumex acetosa
Common Sorrel
Rumex acetosella
Sheep's Sorrel
Rumex crispus
Curled Dock
Rumex cristatus
Greek Dock
Rumex maritimus
Golden Dock
Rumex palustris
Marsh Dock
Rumex sanguineus
Wood Dock
Russelia equisetiformis
Firecracker Plant
Sabulina verna
Spring Sandwort
Sagina apetala
Annual Pearlwort
Sagina nodosa
Knotted Pearlwort
Sagina procumbens
Procumbent Pearlwort
Sagittaria sagittifolia
Arrowhead
Salicornia dolichostachya
Long-spiked Glasswort
Salicornia emerici
Shiny Glasswort
Salicornia europaea
Common Glasswort
Salicornia fragilis
Yellow Glasswort
Salicornia ramosissima
Purple Glasswort
Salix cinerea
Grey Willow
Salix herbacea
Dwarf Willow
Salix pentandra
Bay Willow
Salix repens
Creeping Willow
Salix x fragilis
Crack-willow
Salix x meyeriana
Shiny-leaved Willow
Salsola kali
Prickly Saltwort
Salvia farinacea
Mealy Sage