Pseudofumaria alba
Pale Corydalis
Pseudotsuga menziesii
Douglas Fir
Pyracantha coccinea
Firethorn
Pyrola minor
Common Wintergreen
Pyrus cordata
Plymouth Pear
Quercus rubra
Red Oak
Quercus spp.
Oak
Ramonda myconi
Pyrenean-violet
Ranunculus acris
Meadow Buttercup
Rhamnus cathartica
Buckthorn
Rheum officinale
Tibetan Rhubarb
Rhipsalis salicornioides
Spice Cactus
Rhodiola rosea
Roseroot
Rhododendron cinnibarinum
Rhododendron lindleyi
Rhododendron loderi
Rhododendron racemosum
Rhododendron (racemosum)
Rorippa islandica
Northern Yellow-cress
Rosa rubiginosa
Sweet-briar
Rosa sp.
Rose, Albertine
Albertine Rose
Rosmarinus officinalis
Rosemary
Rubus ariconiensis
Rubus biloensis
Rubus iscanus
Rubus pedemontanus
Rubus troiensis
Rumex scutatus
French Sorrel
Salvia elegans
Pineapple sage
Salvia microphylla
Blackcurrant Sage
Salvia officinalis
Sage
Satureja montana
Winter Savory
Saxifraga
Saxifrage
Saxifraga cernua
Drooping Saxifrage
Saxifraga cespitosa
Tufted Saxifrage
Saxifraga paniculata
Livelong Saxifrage
Saxifraga tridactylites
Rue-leaved Saxifrage
Saxifraga umbrosa
Pyrenean Saxifrage
Schizostylis coccinea
Kaffir Lily
Schlumbergera bridgesii
Christmas cactus
Scilla luciliae
Boissier's Glory-of-the-snow
Scilla peruviana
Portuguese Squill
Scilla siberica
Siberian Squill
Sedum acre
Biting Stonecrop
Sempervivum arachnoideum
Cobweb House-leek
Senecio cambrensis
Welsh Groundsel
Sequoia sempervirens
Coastal Redwood
Sequoiadendron giganteum
Wellingtonia
Silene chalcedonica
Maltese-Cross
Silene flos-cuculi
Ragged-Robin
Silene noctiflora
Night-flowering Catchfly
Silene nutans
Nottingham Catchfly
Sisyrinchium bermudiana
Blue-eyed-grass
Smyrnium perfoliatum
Perfoliate Alexanders
Sorbus x motleyi
Sparmannia sp.
African Hemp
Stachys alpina
Limestone Woundwort
Stachys byzantina
Lamb's-ear
Stachys germanica
Downy Woundwort
Stapelia variegata
Sternbergia lutea
Winter Daffodil
Tanacetum parthenium
Feverfew
Taraxacum 'iscanum'
Taraxacum porteri
Thuja plicata
Western Red-cedar
Thymus drucei
Wild Thyme
Tilia platyphyllos
Large-leaved Lime
Tilia sp.
Lime
Trachycarpus fortunei
Chusan Palm
Tragopogon porrifolius
Salsify