Index
- Sabal etonia, scrub palmetto
- Sabal minor, dwarf palmetto
- Sabal palmetto, cabbage palm
- Sabatia angularis, rose-pink
- Sabatia bartramii, Bartram's marsh-pink
- Sabatia brevifolia, white marsh-pink
- Sabatia calycina, short-leaved marsh-pink
- Sabatia dodecandra, ten-petal marsh-pink
- Sabatia grandiflora, large-flowered marsh-pink
- Sabatia macrophylla, marsh-pink
- Sabatia quadrangula, four-angle rose-gentian
- Sabatia stellaris, star marsh-pink
- Saccharum giganteum, sugarcane plumegrass
- Saccharum officinarum, sugarcane
- Sacciolepis striata, American cupscale
- Sacoila lanceolata, scarlet ladies' tresses
- Sageretia minutiflora, tiny-leaved buckthorn
- Sagittaria filiformis, arrowhead
- Sagittaria graminea, grassy arrowhead, slender arrowhead
- Sagittaria isoetiformis, slender arrowhead
- Sagittaria kurziana, springtape
- Sagittaria lancifolia, lance-leaved arrowhead
- Sagittaria latifolia, wapato, common arrowhead
- Sagittaria subulata, awl-leaf arrowhead
- Salicornia perennis, perennial glasswort
- Salix babylonica, weeping willow
- Salix caroliniana, Carolina willow
- Salix eriocephala, heart-leaved willow
- Salix floridana, Florida willow
- Salix nigra, black willow
- Salsola kali subsp. pontica, Russian thistle
- Salvia azurea, blue sage
- Salvia coccinea, scarlet sage, tropical sage
- Salvia lyrata, lyre-leaved sage
- Salvia misella, creeping sage
- Salvia urticifolia, nettleleaved sage
- Salvinia minima, water spangles
- Sambucus nigra var. canadensis, elderberry
- Samolus ebracteatus, water pimpernel
- Samolus valerandi subsp. parviflorus, pineland pimpernel
- Sanguinaria canadensis, bloodroot
- Sansevieria hyacinthoides, African bowstring hemp, mother-in-law's tongue
- Sapindus saponaria, wingleaf soapberry
- Sapium sebiferum, Chinese tallowtree, popcorn tree
- Saponaria officinalis, bouncing bet
- Sarcostemma clausum, white-vine
- Sarracenia flava, trumpet-leaf pitcher plant
- Sarracenia leucophylla, white-top pitcher plant
- Sarracenia minor, hooded pitcher plant
- Sarracenia psittacina, parrot pitcher plant
- Sarracenia rosea, gulf purple pitcher plant
- Sarracenia rubra, sweet (=red-flowered) pitcher plant
- sarracinia x naczii, S. flava x S. rosea
- Sassafras albidum, sassafras
- Saururus cernuus, lizard's-tail
- Scaevola plumieri, beachberry
- Scaevola sericea var. taccada, naupka
- Scaevola taccada var. sericea, beach naupka
- Schefflera actinophylla, schlefflera
- Schinus terebinthifolius, Brazilian-pepper
- Schizachyrium niveum, scrub autumngrass
- Schizachyrium scoparium, little bluestem
- Schoenolirion albiflorum, white sunny-bells
- Schoenoplectus americanus, Olney's bulrush, three-square bulrush
- Schoenus nigricans, black-sedge
- Schoepfia chrysophylloides, graytwig, whitewood
- Schwalbea americana, chaff-seed
- Scirpus californicus, giant bulrush
- Scirpus cubensis, Cuban bulrush
- Scirpus cyperinus, woolgrass
- Scirpus etuberculatus, swamp bulrush
- Scirpus lineatus, bulrush
- Scirpus pungens, swordgrass
- Scirpus tabernaemontani, great bulrush, soft-stem bulrush
- Scleria baldwinii, Baldwin's nutrush
- Scleria ciliata, fringed fringed nutrush
- Scleria oligantha, little-head nutrush
- Scleria reticularis, netted nutrush
- Scleria triglomerata, tall nutrush
- Scoparia dulcis, sweetbroom
- Scutellaria arenicola, Florida scrub skullcap
- Scutellaria elliptica, hairy skullcap
- Scutellaria havanensis, Havana skullcap
- Scutellaria integrifolia, rough skullcap, helmet skullcap
- Scutellaria multiglandulosa, Small's skullcap
- Sebastiania fruticosa, gulf sebastian bush
- Selaginella apoda var. ludoviciana, Gulf spikemoss
- Selaginella arenicola, sand sand spikemoss
- Selenicereus pteranthus, princess-of-the-night
- Senecio aureus, golden ragwort
- Senecio obovatus, ragwort
- Senna alata, candlebush, candlestick plant
- Senna marilandica, wild senna
- Senna mexicana var. chapmanii, Bahama senna, Chapman's sensitive plant
- Senna obtusifolia, sicklepod, coffeeweed
- Senna occidentalis, coffee senna
- Serenoa repens, saw palmetto
- Sericocarpus tortifolius, white-topped aster
- Sesbania herbacea, hemp sesban
- Sesbania punicea, daubentonia, purple sesban
- Sesbania vesicaria, bladderpod, bagpod
- Sesbania virgata, wand riverhemp
- Sesuvium portulacastrum, sea-purslane
- Setaria corrugata, coastal foxtail
- Setaria macrosperma, coral foxtail
- Setaria magna, giant bristlegrass
- Setaria parviflora, yellow foxtail, knotroot foxtail
- Setaria sphacelata, African bristlegrass
- Seymeria cassioides, yaupon blacksenna, cassia seymeria
- Seymeria pectinata, piedmont blacksenna
- Sida acuta, broomweed
- Sida cordifolia, heartleaf sida
- Sida rhombifolia, Indian hemp
- Sida santaremensis, moth fanpetals
- Sida spinosa, prickly mallow
- Sideroxylon alachuense, silver buckthorn
- Sideroxylon celastrinum, saffron-plum
- Sideroxylon foetidissimum, mastic, false mastic, wild olive
- Sideroxylon lanuginosum, gum bumelia
- Sideroxylon reclinatum, smooth buckthorn
- Sideroxylon rufohirtum, rufous Florida bully
- Sideroxylon salicifolium, willow-bustic
- Sideroxylon tenax, buckthorn
- Silene caroliniana, catchfly
- Silphium asteriscus, starry rosinweed
- Silphium compositum, kidneyleaf rosinweed
- Simarouba glauca, paradise tree, bitterwood.
- Sinapis arvensis, charlock mustard
- Sisyrinchium angustifolium, pointed blue-eyed-grass
- Sisyrinchium nashii, sandhill blue-eyed-grass
- Sisyrinchium rosulatum, yellow blue-eyed grass, annual blue-eyed-grass
- Sisyrinchium xerophyllum, scrub blue-eyed-grass
- Sium suave, water parsnip
- Smilax auriculata, greenbrier, wild-bamboo
- Smilax bona-nox, saw greenbrier
- Smilax ecirrhata, carrionflower greenbrier
- Smilax glauca, cat greenbrier, wild sarsaparilla
- Smilax havanensis, Everglades greenbrier
- Smilax laurifolia, laurel greenbriar
- Smilax pumila, sarsaparilla vine, wild sarsaparilla
- Smilax walteri, coral greenbrier
- Solanum americanum, common nightshade
- Solanum bahamense, Key West cankerberry
- Solanum capsicoides, soda-apple, cockroachberry
- Solanum carolinense, horse-nettle, Carolina nettle
- Solanum carolinense var. floridanum, Florida horsenettle
- Solanum diphyllum, twoleaf nightshade
- Solanum donianum, mullein nightshade
- Solanum dulcamara, climbing nightshade
- Solanum erianthum, potatotree, mullein nightshade, shrub nightshade
- Solanum seaforthianum, climbing nightshade, Brazilian nightshade.
- Solanum sisymbriifolium, sticky nightshade
- Solanum viarum, tropical soda-apple
- Solidago caesia, bluestem goldenrod
- Solidago canadensis var. scabra, goldenrod
- Solidago fistulosa, pinebarren goldenrod, hollow goldenrod
- Solidago latissimifolia, goldenrod
- Solidago odora, sweet goldenrod
- Solidago odora var. chapmanii, sweet goldenrod
- Solidago rugosa subsp. aspera, roughleaf goldenrod
- Solidago sempervirens, seaside goldenrod
- Solidago stricta, slender goldenrod, smooth goldenrod
- Solidago tortifolia, twisted-leaf goldenrod
- Sonchus asper, spiny-leaved sow thistle
- Sonchus oleraceus, common annual sow thistle
- Sophora tomentosa var. truncata, yellow necklacepod
- Sorghastrum elliottii, slender Indiangrass
- Sorghastrum nutans, yellow Indiangrass
- Sorghastrum secundum, lopsided Indiangrass
- Sparganium americanum, American bur-reed
- Spartina alterniflora var. glabra, saltmarsh cordgrass
- Spartina bakeri, sand cordgrass
- Spartina cynosuroides, big cordgrass
- Spartina patens, marshhay cordgrass
- Spermacoce prostrata, buttonweed
- Spermacoce verticillata, spermacoce
- Sphagneticola trilobata, wedelia
- Sphenopholis pensylvanica, swamp wedgescale
- Spigelia gentianoides, gentian pinkroot
- Spigelia loganioides, Florida pink-root, Levy pinkroot
- Spigelia marilandica, Indian pink
- Spiranthes brevilabris, Florida ladies'-tresses
- Spiranthes cernua, nodding autumn ladies'-tresses
- Spiranthes odorata, fragrant ladies'-tresses
- Spiranthes praecox, grass-leaf ladies'-tresses
- Spiranthes sylvatica, woodland ladies' tresses
- Spiranthes torta, southern ladies'-tresses
- Spiranthes vernalis, spring ladies'-tresses
- Spondias purpurea, hog plum
- Sporobolus indicus, smutgrass
- Sporobolus junceus, pineywoods dropseed
- Sporobolus vaginiflorus, poverty dropseed
- Sporobolus virginicus, seashore dropseed
- Stachys floridana, Florida hedgenettle, Florida betony
- Stachytarpheta jamaicensis, blue porterweed
- Stachytarpheta urticifolia, blue porterweed
- Staphylea trifolia, American bladdernut
- Stellaria media, common chickweed
- Stenandrium dulce, stenandrium, sweet shaggytuff
- Stenaria nigricans var. floridana, pineland innocence
- Stenotaphrum secundatum, St. Augustine grass
- Stillingia aquatica, corkwood
- Stillingia sylvatica, queen's delight
- Stipulicida setacea, wireweed
- Stokesia laevis, stokesia
- Striga gesnerioides, witchweed
- Stylisma abdita, scrub stylisma
- Stylisma humistrata, stylisma
- Stylisma patens, coastalplain stylisma
- Stylisma villosa, hairy stylisma
- Stylosanthes biflora, pencilflower
- Stylosanthes hamata, southern pencilflower
- Styrax americanus, American snowbell, mock-orange
- Styrax grandifolius, snowbell
- Suaeda linearis, sea blite, seepweed
- Suriana maritima, bay-cedar
- Swietenia mahagoni, West Indian mahogany
- Symphyotrichum adnatum, tight-leaved aster, scaleleaf aster
- Symphyotrichum carolinianum, climbing aster
- Symphyotrichum chapmanii, southern aster, Chapman's aster
- Symphyotrichum concolor, eastern silver aster
- Symphyotrichum dumosum, bush aster
- Symphyotrichum elliottii, Elliott's aster
- Symphyotrichum lateriflorum, calico aster
- Symphyotrichum patens, late fall aster, clasping-leaf aster
- Symphyotrichum tenuifolium, perennial saltmarsh aster
- Symplocos tinctoria, sweetleaf, horse-sugar
- Syngonanthus flavidulus, bantam-buttons
- Syngonium podophyllum, arrowhead vine
- Syzygium cumini, jambolan, Java-plum
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