Salvia
Sabi Star
Sand_Verbena
Sarracenia
Satin_Poppy
Scarlet_Plume
Scorpion_Senna
Sea_Lavender
Shaddock
Shamrocks
Shasta_Daisy
Snap_Dragons
Snow_Drop
Snow_Flower
Sowbread
Spear_Lily
Spider_Lily
Spoon_Lily
Spurge
Star_of_the_Veldt
Summer_Hyacinth
Sunflower
Swamp_Daisy
Swamp_Hibiscus
Swamp_Lily
Sweet_Mary
Sweet_Sultan
Sweet_William
Syringa
Snapdragon, Soldaster and Sweet Pea are flowers. They begin with the letter S.
Umbrella plant, urginea and ursinia are flowers. They begin with the letter U.
Bird of Paradise and Bluebells are flowers. They begin with the letter b.
Daffodil.
Daisey's
Iris.
Nightshade
Carnation
impatients and iris
Sweet pea, sunflower, salvia, snowball and snapdragon are flowers. They begin with the letter S.
Magnolia, marigold, morning glory and mums are flowers. They begin with the letter M.
Perhaps a Tulip?