S
- Sabatia angularis (N)
- Saccharum alopecuroides (N)
- Saccharum ravennae (I)
- Sagina decumbens ssp. decumbens (N)
- Sagina japonica (I)
- Sagina procumbens (I)
- Sagina procumbens (N)
- Sagittaria australis (N)
- Sagittaria brevirostra (N)
- Sagittaria calycina var. calycina (N)
- Sagittaria cuneata (N)
- Sagittaria graminea var. graminea (N)
- Sagittaria latifolia (N)
- Sagittaria platyphylla (N)
- Sagittaria rigida (N)
- Salicornia depressa (N)
- Salix alba (I)
- Salix amygdaloides (N)
- Salix bebbiana (N)
- Salix candida (N)
- Salix caprea (I)
- Salix caroliniana (N)
- Salix cinerea (I)
- Salix discolor (N)
- Salix × ehrhartiana (I)
- Salix × ehrhartiana (N)
- Salix eriocephala (N)
- Salix fragilis (I)
- Salix × glatfelteri (N)
- Salix humilis var. humilis (N)
- Salix humilis var. tristis (N)
- Salix interior (N)
- Salix lucida ssp. lucida (N)
- Salix matsudana (I)
- Salix myricoides var. albovestita (N)
- Salix myricoides var. myricoides (N)
- Salix nigra (N)
- Salix pedicellaris (N)
- Salix × pendulina (I)
- Salix pentandra (I)
- Salix petiolaris (N)
- Salix purpurea (I)
- Salix × rubens (I)
- Salix sericea (N)
- Salix serissima (N)
- Salix viminalis (I)
- Salsola collina (I)
- Salsola tragus (I)
- Salvia azurea var. grandiflora (N)
- Salvia coccinea (N)
- Salvia farinacea (N)
- Salvia lyrata (N)
- Salvia officinalis (I)
- Salvia pratensis (I)
- Salvia reflexa (N)
- Salvia splendens (I)
- Salvia × superba (I)
- Salvia × sylvestris (I)
- Sambucus nigra (I)
- Sambucus nigra ssp. canadensis (N)
- Sambucus racemosa var. racemosa (N)
- Samolus valerandi (I)
- Samolus valerandi ssp. parviflorus (N)
- Sanguinaria canadensis (N)
- Sanguisorba canadensis (N)
- Sanguisorba minor ssp. balearica (I)
- Sanicula canadensis var. canadensis (N)
- Sanicula canadensis var. grandis (N)
- Sanicula marilandica (N)
- Sanicula odorata (N)
- Sanicula smallii (N)
- Sanicula trifoliata (N)
- Saponaria officinalis (I)
- Sarracenia purpurea ssp. purpurea (N)
- Sassafras albidum (N)
- Satureja hortensis (I)
- Saururus cernuus (N)
- Saxifraga pensylvanica (N)
- Saxifraga virginiensis var. virginiensis (N)
- Scabiosa columbaria (I)
- Scandix pecten-veneris (I)
- Schedonorus phoenix (I)
- Schedonorus pratensis (I)
- Scheuchzeria palustris ssp. americana (N)
- Schizachne purpurascens (N)
- Schizachyrium littorale (N)
- Schizachyrium scoparium var. scoparium (N)
- Schoenoplectus acutus var. acutus (N)
- Schoenoplectus fluviatilis (N)
- Schoenoplectus pungens var. pungens (N)
- Schoenoplectus purshianus (N)
- Schoenoplectus saximontanus (N)
- Schoenoplectus smithii (N)
- Schoenoplectus subterminalis (N)
- Schoenoplectus tabernaemontani (N)
- Schoenoplectus torreyi (N)
- Scilla siberica (I)
- Scirpus atrovirens (N)
- Scirpus cyperinus (N)
- Scirpus expansus (N)
- Scirpus georgianus (N)
- Scirpus hattorianus (N)
- Scirpus pedicellatus (N)
- Scirpus pendulus (N)
- Scirpus polyphyllus (N)
- Scleranthus annuus (I)
- Scleria oligantha (N)
- Scleria pauciflora var. caroliniana (N)
- Scleria pauciflora var. pauciflora (N)
- Scleria triglomerata (N)
- Scleria verticillata (N)
- Sclerochloa dura (I)
- Sclerochloa dura (N)
- Scrophularia lanceolata (N)
- Scrophularia marilandica (N)
- Scutellaria elliptica var. elliptica (N)
- Scutellaria elliptica var. hirsuta (N)
- Scutellaria galericulata (N)
- Scutellaria incana var. incana (N)
- Scutellaria integrifolia (N)
- Scutellaria lateriflora var. lateriflora (N)
- Scutellaria nervosa (N)
- Scutellaria ovata ssp. ovata (N)
- Scutellaria parvula var. missouriensis (N)
- Scutellaria parvula var. parvula (N)
- Scutellaria saxatilis (N)
- Scutellaria serrata (N)
- Secale cereale (I)
- Securigera varia (I)
- Sedum acre (I)
- Sedum album (I)
- Sedum dendroideum (I)
- Sedum pulchellum (N)
- Sedum reflexum (I)
- Sedum sarmentosum (I)
- Sedum sexangulare (I)
- Sedum ternatum (N)
- Selaginella apoda (N)
- Selaginella eclipes (N)
- Selaginella rupestris (N)
- Senecio sylvaticus (I)
- Senecio vulgaris (I)
- Senna hebecarpa (N)
- Senna marilandica (N)
- Sericocarpus asteroides (N)
- Sericocarpus linifolius (N)
- Sesamum orientale (I)
- Setaria faberi (I)
- Setaria italica (I)
- Setaria parviflora (N)
- Setaria pumila ssp. pumila (I)
- Setaria verticillata (I)
- Setaria viridis var. viridis (I)
- Shepherdia canadensis (N)
- Sherardia arvensis (I)
- Sibara virginica (N)
- Sicyos angulatus (N)
- Sida hermaphrodita (N)
- Sida spinosa (N)
- Silene antirrhina (N)
- Silene armeria (I)
- Silene caroliniana ssp. pensylvanica (N)
- Silene caroliniana ssp. wherryi (N)
- Silene conica (I)
- Silene csereii (I)
- Silene dichotoma (I)
- Silene dioica (I)
- Silene latifolia ssp. alba (I)
- Silene nivea (N)
- Silene noctiflora (I)
- Silene nutans (I)
- Silene regia (N)
- Silene rotundifolia (N)
- Silene stellata (N)
- Silene virginica var. virginica (N)
- Silene vulgaris (I)
- Silphium laciniatum var. laciniatum (N)
- Silphium perfoliatum var. perfoliatum (N)
- Silphium terebinthinaceum var. luciae-brauniae (N)
- Silphium terebinthinaceum var. terebinthinaceum (N)
- Silphium trifoliatum var. latifolium (N)
- Silphium trifoliatum var. trifoliatum (N)
- Silybum marianum (I)
- Sinapis alba (I)
- Sinapis arvensis ssp. arvensis (I)
- Sisymbrium altissimum (I)
- Sisymbrium irio (I)
- Sisymbrium loeselii (I)
- Sisymbrium officinale (I)
- Sisyrinchium albidum (N)
- Sisyrinchium angustifolium (N)
- Sisyrinchium atlanticum (N)
- Sisyrinchium montanum var. crebrum (N)
- Sisyrinchium mucronatum (N)
- Sium suave (N)
- Smallanthus uvedalius (N)
- Smilax ecirrhata (N)
- Smilax glauca (N)
- Smilax herbacea (N)
- Smilax illinoensis (N)
- Smilax lasioneura (N)
- Smilax pulverulenta (N)
- Smilax rotundifolia (N)
- Smilax tamnoides (N)
- Solanum carolinense var. carolinense (N)
- Solanum dulcamara var. dulcamara (I)
- Solanum lycopersicum var. lycopersicum (I)
- Solanum physalifolium (I)
- Solanum ptycanthum (N)
- Solanum rostratum (N)
- Solanum triflorum (N)
- Solanum tuberosum (I)
- Solidago altissima (N)
- Solidago arguta var. arguta (N)
- Solidago bicolor (N)
- Solidago caesia (N)
- Solidago canadensis var. canadensis (N)
- Solidago canadensis var. gilvocanescens (N)
- Solidago canadensis var. hargeri (N)
- Solidago erecta (N)
- Solidago flexicaulis (N)
- Solidago gigantea (N)
- Solidago hispida var. hispida (N)
- Solidago juncea (N)
- Solidago nemoralis var. nemoralis (N)
- Solidago odora var. odora (N)
- Solidago patula var. patula (N)
- Solidago puberula var. puberula (N)
- Solidago rugosa ssp. aspera (N)
- Solidago rugosa ssp. rugosa var. rugosa (N)
- Solidago rugosa ssp. rugosa var. villosa (N)
- Solidago rugosa ssp. rugosa (N)
- Solidago rupestris (N)
- Solidago sempervirens var. sempervirens (N)
- Solidago speciosa var. rigidiuscula (N)
- Solidago speciosa var. speciosa (N)
- Solidago sphacelata (N)
- Solidago squarrosa (N)
- Solidago uliginosa var. linoides (N)
- Solidago uliginosa var. uliginosa (N)
- Solidago ulmifolia var. ulmifolia (N)
- Sonchus arvensis ssp. arvensis (I)
- Sonchus arvensis ssp. uliginosus (I)
- Sonchus asper (I)
- Sonchus oleraceus (I)
- Sorbaria sorbifolia (I)
- Sorbus aucuparia (I)
- Sorbus decora (N)
- Sorghastrum nutans (N)
- Sorghum bicolor ssp. bicolor (I)
- Sorghum halepense (I)
- Sparganium americanum (N)
- Sparganium androcladum (N)
- Sparganium emersum (I)
- Sparganium emersum (N)
- Sparganium eurycarpum (N)
- Spartina pectinata (N)
- Spergula arvensis (I)
- Spergularia maritima (I)
- Spergularia rubra (I)
- Spergularia salina (N)
- Spermacoce glabra (N)
- Sphenopholis intermedia (N)
- Sphenopholis nitida (N)
- Sphenopholis obtusata (N)
- Sphenopholis × pallens (N)
- Sphenopholis pensylvanica (N)
- Spinacia oleracea (I)
- Spiraea alba var. alba (N)
- Spiraea alba var. latifolia (N)
- Spiraea japonica var. fortunei (I)
- Spiraea prunifolia (I)
- Spiraea tomentosa (N)
- Spiraea × vanhouttei (I)
- Spiraea virginiana (N)
- Spiranthes cernua (N)
- Spiranthes lacera var. gracilis (N)
- Spiranthes lacera var. lacera (N)
- Spiranthes lucida (N)
- Spiranthes magnicamporum (N)
- Spiranthes ochroleuca (N)
- Spiranthes ovalis var. erostellata (N)
- Spiranthes romanzoffiana (N)
- Spiranthes tuberosa (N)
- Spiranthes vernalis (N)
- Spirodela polyrrhiza (N)
- Sporobolus compositus var. compositus (N)
- Sporobolus cryptandrus (N)
- Sporobolus heterolepis (N)
- Sporobolus neglectus (N)
- Sporobolus vaginiflorus var. ozarkanus (N)
- Sporobolus vaginiflorus var. vaginiflorus (N)
- Stachys aspera (N)
- Stachys cordata (N)
- Stachys germanica (I)
- Stachys palustris (N)
- Stachys pilosa var. arenicola (N)
- Stachys sylvatica (I)
- Stachys tenuifolia (N)
- Staphylea trifolia (N)
- Stellaria alsine (N)
- Stellaria corei (N)
- Stellaria graminea (I)
- Stellaria holostea (I)
- Stellaria longifolia var. longifolia (N)
- Stellaria media ssp. media (I)
- Stellaria media ssp. pallida (I)
- Stellaria pubera (N)
- Stenanthium gramineum var. gramineum (N)
- Stenanthium gramineum var. robustum (N)
- Stenaria nigricans var. nigricans (N)
- Stenosiphon linifolius (N)
- Streptopus lanceolatus var. lanceolatus (N)
- Streptopus lanceolatus var. roseus (N)
- Strophostyles helvola (N)
- Strophostyles leiosperma (N)
- Strophostyles umbellata (N)
- Stuckenia filiformis ssp. alpina (N)
- Stuckenia pectinata (N)
- Stuckenia vaginata (N)
- Stylophorum diphyllum (N)
- Stylosanthes biflora (N)
- Styphnolobium japonicum (I)
- Styrax americanus (N)
- Styrax grandifolius (N)
- Suaeda calceoliformis (N)
- Sullivantia sullivantii (N)
- Symphoricarpos albus var. albus (N)
- Symphoricarpos albus var. laevigatus (N)
- Symphoricarpos occidentalis (N)
- Symphoricarpos orbiculatus (N)
- Symphyotrichum boreale (N)
- Symphyotrichum ciliatum (N)
- Symphyotrichum cordifolium (N)
- Symphyotrichum drummondii var. drummondii (N)
- Symphyotrichum dumosum var. strictior (N)
- Symphyotrichum ericoides var. ericoides (N)
- Symphyotrichum laeve var. laeve (N)
- Symphyotrichum lanceolatum ssp. lanceolatum var. hirsuticaule (N)
- Symphyotrichum lanceolatum ssp. lanceolatum var. interior (N)
- Symphyotrichum lanceolatum ssp. lanceolatum var. lanceolatum (N)
- Symphyotrichum lanceolatum ssp. lanceolatum var. latifolium (N)
- Symphyotrichum lanceolatum ssp. lanceolatum (N)
- Symphyotrichum lateriflorum var. lateriflorum (N)
- Symphyotrichum lowrieanum (N)
- Symphyotrichum novae-angliae (N)
- Symphyotrichum oblongifolium (N)
- Symphyotrichum ontarionis (N)
- Symphyotrichum oolentangiense var. oolentangiense (N)
- Symphyotrichum patens var. patens (N)
- Symphyotrichum phlogifolium (N)
- Symphyotrichum pilosum var. pilosum (N)
- Symphyotrichum pilosum var. pringlei (N)
- Symphyotrichum praealtum var. praealtum (N)
- Symphyotrichum prenanthoides (N)
- Symphyotrichum puniceum var. puniceum (N)
- Symphyotrichum racemosum (N)
- Symphyotrichum sericeum (N)
- Symphyotrichum shortii (N)
- Symphyotrichum subulatum (N)
- Symphyotrichum undulatum (N)
- Symphyotrichum urophyllum (N)
- Symphytum asperum (I)
- Symphytum officinale (I)
- Symplocarpus foetidus (N)
- Synandra hispidula (N)
- Syringa vulgaris (I)
Read more about this topic: Flora Of Ohio