Scirpoides holoschoenus
Round-headed Club-rush
Scirpus sylvaticus
Wood Club-rush
Secale cereale
Rye
Setaria viridis
Green Bristle-grass
Simethis mattiazzii
Kerry Lily
Sisyrinchium bermudiana
Blue-eyed-grass
Sisyrinchium montanum
American Blue-eyed-grass
Sparganium angustifolium
Floating Bur-reed
Sparganium erectum
Branched Bur-reed
Sparganium natans
Least Bur-reed
Spartina anglica
Common Cord-grass
Spathiphyllum blandum
Pleasant Peace Lily
Spiranthes romanzoffiana
Irish Lady's-tresses
Spiranthes spiralis
Autumn Lady's-tresses
Spirodela polyrhiza
Greater Duckweed
Sternbergia lutea
Winter Daffodil
Stromanthe thalia
Stuckenia pectinata
Fennel Pondweed
Tamus communis
Black Bryony
Thysanolaena latifolia
Tiger Grass
Tofieldia pusilla
Scottish Asphodel
Trachycarpus fortunei
Chusan Palm
Tradescantia pallida
Purple Heart
Tradescantia spathacea
Oyster Plant