Pulsatilla alpina
Alpine Pasque#Flower
Pulsatilla pratensis
Small Pasque#Flower
Pyrola minor
Common Wintergreen
Pyrola rotundifolia
Round-leaved Wintergreen
Pyrus cordata
Plymouth Pear
Radermachera yunnanensis
Ramalina fastigiata
Rhinanthus alectorolophus
European Yellow-rattle
Rhodiola rosea
Roseroot
Ricinus communis
Castor-oil-plant
Rosa rubiginosa
Sweet-briar
Rubia peregrina
Wild Madder
Ruella simplex
Mexican Petunia
Rumex confertus
Russian Dock
Sabulina verna
Spring Sandwort
Sagina procumbens
Procumbent Pearlwort
Sagittaria sagittifolia
Arrowhead
Salix herbacea
Dwarf Willow
Salpichroa origanifolia
Cock's-eggs
Salvia involucrata
Rosy-leaf sage
Salvia leucanthe
Mexican Bush Sage
Salvia pratensis
Meadow Clary
Salvia splendens
Bonfire Salvia
Sambucus canadensis
American Elderberry