| Common name (English) | |
|---|---|
| Schinus terebinthifolia | Brazilian pepper-tree |
| Scilla bifolia | Alpine Squill |
| Senegalia greggii | Texas-mimosa |
| Sequoia sempervirens | Coastal redwood |
| Sequoiadendron giganteum | |
| Setaria italica | |
| Silene noctiflora | |
| Solanum laciniatum | New Zealand nightshade |
| Spartium junceum | Spanish broom |
| Stenotaphrum secundatum | St. Augustine grass |
| Styphnolobium japonicum | Chinese scholartree, Japanese Pagoda Tree |
| Syringa vulgaris | Common lilac |
| Taxodium distichum | Bald cypress, Swamp cypress, Deciduous cypress |
| Taxus baccata | Common Yew, Ebglish Yew |
| Tecoma capensis | Cape honeysuckle |
| Tecoma stans | Yellow trumpetbush |
| Tilia tomentosa | Hungarian silver linden |
| Tradescantia fluminensis | |
| Tripleurospermum inodorum | |
| Tulipa agenensis |