| Threatened |
|---|
| Sarracenia minor | Hooded pitcherplant |
| Sarracenia psittacina | Parrot pitcherplant |
| Sarracenia purpurea | Decumbant pitcherplant |
| Sarracenia rubra | Red-flowered (=sweet) pitcherplant |
| Scaevola plumieri | Inkberry |
| Spiranthes laciniata | Lace-lip ladies' tresses |
| Spiranthes longilabris | Long-lip ladies' tresses |
| Spiranthes tuberosa | Little ladies' tresses; little pearl twist |
| Stenorrhynchos lanceolata | Leafless beak orchid |
| Tectaria heracleifolia | Broad halberd fern |
| Tetrazygia bicolor | Tetrazygia |
| Thelypteris augescens | Abrupt-tipped maiden fern |
| Tillandsia balbisiana | Inflated (=reflexed) wild pine |
| Tillandsia valenzuelana | Soft-leaved wild pine |
| Tipularia discolor | Crane-fly orchid |
| Triphora trianthophora | Three-birds orchid |
| Endangered |
|---|
| Sachsia bahamensis | Bahama sachsia |
| Salix eriocephala | Heart-leaved willow |
| Salix floridana | Florida willow |
| Salvia urticifolia | Nettle-leaved sage |
| Sarracenia leucophylla | White-top pitcherplant |
| Schisandra coccinea | Bay star vine |
| Schizaea germanii | Ray (=tropical curly-grass) fern |
| Schwalbaea americana | American chaffseed |
| Scutellaria floridana | Florida skullcap; helmet-flowers |
| Selaginella eatonii | Pygmy spikemoss |
| Silene polypetala | Fringed campion; fringed catchfly |
| Sphenomeris clavata | Parsley (=wedgelet) fern |
| Sphenostigma coelestina | Bartram's ixia |
| Spigelia gentianoides | Gentian (=panhandle) pinkroot |
| Spigelia loganioides | Florida (=Levy) pinkroot |
| Spiranthes adnata | Pelexia |
| Spiranthes brevilabris | Florida ladies' tresses |
| Spiranthes costaricensis | Costa Rican ladies' tresses |
| Spiranthes elata | Tall neottia |
| Spiranthes ovalis | Oval ladies' tresses |
| Spiranthes polyantha | Florida Keys (=green) ladies' tresses |
| Spiranthes torta | Southern ladies' tresses |
| Stachydeoma araveolens | Mock pennyroyal |
| Stachys crenata | Shade betony |
| Stachys tenuifolia | Narrow-leaved betony |
| Staphylea trifolia | Bladdernut |
| Stewartia malacodendron | Silky camellia |
| Strumpfia maritima | Pride-of-big-pine |
| Stylisma abdita | Hidden stylisma |
| Suriana maritima | Bay cedar |
| Swietenia mahogani | West Indian mahogany |
| Taxus floridana | Florida yew |
| Tectaria coriandrifolia | Hairy (=Hattie Bauer) halberd fern |
| Tectaria fimbriata (=lobata) | Least halberd fern |
| Tephrosia angustissima | Narrow-leaved (=coastal) hoary pea |
| Thalictrum cooleyi | Cooley's meadowrue |
| Thalictrum thalictroides | Rue anemone |
| Thalypteris grandis | Collier County maiden fern |
| Thelypteris patens | Grid-scale maiden fern |
| Thelypteris reptans | Creeping star-hair fern |
| Thelypteris reticulata | Lattice-vein (=cypress) fern |
| Thelypteris sclerophylla | Stiff star-hair fern |
| Thelypteris serrata | Dentate lattice vein fern |
| Thrinax morrissi | Brittle thatch palm |
| Thrinax radiata | Florida thatch palm |
| Tillandsia fasciculata | Common (=stiff-leaved) wild pine |
| Tillandsia flexuosa | Twisted and banded air plant |
| Tillandsia pruinosa | Fuzzy-wuzzy (=hoary) air plant |
| Tillandsia utriculata | Giant wild pine; giant air plant |
| Torreya taxifolia | Florida torreya |
| Tournefortia gnaphalodes | Sea lavender |
| Tragia saxicola | Florida keys (=rocklands) noseburn |
| Trichomanes holopterum | Entire winged bristle fern |
| Trichomanes krausii | Krause's bristle fern |
| Trichomanes lineolatum | Lined bristle fern |
| Trichomanes punctatum | Florida bristle fern |
| Trillium lancifolium | Lance-leaved wake-robin |
| Triphora craigheadii | Craighead's nodding-caps |
| Triphora latifolia | Broad-leaved nodding-caps |
| Tripsacum floridanum | Florida tripsacum |
| Tropidia polystachya | Young-palm orchid |
Protected Plants: S-T