Scutellaria galericulata
Skullcap
Scutellaria minor
Lesser Skullcap
Secale cereale
Rye
Sedum acre
Biting Stonecrop
Sedum album
White Stonecrop
Sedum anglicum
English Stonecrop
Sedum sexangulare
Tasteless Stonecrop
Seemannia sylvatica
Bolivian Sunset Gloxinia
Selaginella martensii
Variegated Spikemoss
Selaginella selaginoides
Lesser Clubmoss
Selaginella willdenowii
Peacock Fern
Selenicereus undatus
Pitahaya
Senecio cambrensis
Welsh Groundsel
Senecio inaequidens
Narrow-leaved Ragwort
Senecio sarracenicus
Broad-leaved Ragwort
Senecio squalidus
Oxford Ragwort
Senecio sylvaticus
Heath Groundsel
Senecio viscosus
Sticky Groundsel
Senecio vulgaris
Groundsel
Senna obtusifolia
Sicklepod
Sequoia sempervirens
Coastal Redwood
Sequoiadendron giganteum
Wellingtonia
Serratula tinctoria
Saw-wort
Setaria viridis
Green Bristle-grass