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
Spathoglottis plicata
Philippine Ground Orchid
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
Syngonium auritum
Arrowhead Vine
Tamus communis
Black Bryony
Thysanolaena latifolia
Tiger Grass
Tofieldia pusilla
Scottish Asphodel
Trachycarpus fortunei
Chusan Palm
Tradescantia pallida
Purple Heart
Tradescantia spathacea
Oyster Plant
Trichophorum germanicum
Deergrass
Triglochin maritima
Sea Arrowgrass
Triglochin palustris
Marsh Arrowgrass