| Family |
Taxon |
Common Name | Photographs |
| Salicaceae |
Salix bebbiana Sarg. |
beaked willow, Bebb's willow |
|
| Salicaceae |
Salix candida Fluggé ex Willd. |
hoary willow, sage-leaved willow |
|
| Salicaceae |
Salix discolor Muhl. |
pussy willow |
|
| Salicaceae |
Salix eriocephala Michx. |
diamond willow, Missouri River willow |
|
| Salicaceae |
Salix exigua Nutt. subsp. interior (Rowlee) Cronquist |
sandbar willow |
|
| Salicaceae |
Salix lucida Muhl. subsp. lucida |
shining willow |
|
| Salicaceae |
Salix nigra Marshall |
black willow |
|
| Salicaceae |
Salix petiolaris Sm. |
meadow willow, slender willow |
|
| Caprifoliaceae |
Sambucus canadensis L. var. canadensis |
American elder, elderberry |
|
| Apiaceae |
Sanicula marilandica L. |
black snakeroot, Maryland sanicle |
|
| Caryophyllaceae |
Saponaria officinalis L. |
bouncing-bet, soapwort |
|
| Sarraceniaceae |
Sarracenia purpurea L. subsp. purpurea |
purple pitcher-plant |
|
| Poaceae |
Schizachyrium scoparium (Michx.) Nash |
broom beard grass, little blue-stem, prairie beard grass |
|
| Poaceae |
Schizachyrium scoparium (Michx.) Nash var. scoparium |
broom beard grass, broom blue-stem, little blue-stem |
|
| Cyperaceae |
Schoenoplectus acutus (Muhl. ex Bigelow) A.Löve & D.Löve var. acutus |
hard-stem bulrush |
|
| Cyperaceae |
Schoenoplectus tabernaemontani (C.C.Gmel.) Palla |
great bulrush, soft-stem bulrush |
|
| Cyperaceae |
Scirpus atrocinctus Fernald |
black-girdled wool-grass |
|
| Cyperaceae |
Scirpus atrovirens Willd. |
black bulrush, dark-green bulrush |
|
| Lamiaceae |
Scutellaria galericulata L. |
common skullcap, marsh skullcap |
|
| Lamiaceae |
Scutellaria lateriflora L. |
blue skullcap, mad-dog skullcap |
|
| Poaceae |
Setaria pumila (Poir.) Roem. & Schult. subsp. pumila |
pigeon grass, yellow foxtail |
|
| Poaceae |
Setaria viridis (L.) P.Beauv. |
green bristle grass, green foxtail |
|
| Caryophyllaceae |
Silene latifolia Poir. |
bladder campion, white campion, white cockle |
|
| Solanaceae |
Solanum dulcamara L. |
bittersweet nightshade, climbing nightshade, deadly nightshade |
|
| Solanaceae |
Solanum ptychanthum Dunal |
eastern black nightshade, West Indian nightshade |
|
| Asteraceae |
Solidago canadensis L. |
Canadian goldenrod, common goldenrod |
|
| Asteraceae |
Solidago canadensis L. var. scabra Torr. & A.Gray |
Canadian goldenrod, common goldenrod, tall goldenrod |
|
| Asteraceae |
Solidago gigantea Aiton |
giant goldenrod, late goldenrod, smooth goldenrod |
|
| Asteraceae |
Solidago uliginosa Nutt. |
northern bog goldenrod |
|
| Asteraceae |
Sonchus arvensis L. |
field sow-thistle, perennial sow-thistle |
|
| Asteraceae |
Sonchus arvensis L. var. glabrescens Günther, Grab. & Wimm. |
marsh sow-thistle |
|
| Sparganiaceae |
Sparganium americanum Nutt. |
American bur-reed |
|
| Sparganiaceae |
Sparganium eurycarpum Engelm. |
broad-fruit bur-reed, common bur-reed, giant bur-reed |
|
| Poaceae |
Sphenopholis intermedia (Rydb.) Rydb. |
slender wedge grass |
|
| Poaceae |
Sphenopholis obtusata (Michx.) Scribn. |
prairie wedge grass, prairie wedge scale |
|
| Rosaceae |
Spiraea alba Du Roi var. alba |
white meadowsweet |
|
| Orchidaceae |
Spiranthes lacera (Raf.) Raf. |
northern slender lady's-tresses |
|
| Orchidaceae |
Spiranthes lacera (Raf.) Raf. var. lacera |
northern slender lady's-tresses |
|
| Orchidaceae |
Spiranthes romanzoffiana Cham. |
hooded lady's-tresses |
|
| Lamiaceae |
Stachys palustris L. |
hedge-nettle, marsh hedge-nettle, woundwort |
|
| Lamiaceae |
Stachys tenuifolia Willd. var. tenuifolia |
narrow-leaved hedge-nettle, smooth hedge-nettle |
|
| Potamogetonaceae |
Stuckenia filiformis (Pers.) Börner |
fine-leaved pondweed, thread-leaf pondweed, thread-leaved pondweed |
|
| Potamogetonaceae |
Stuckenia pectinata (L.) Börner |
comb pondweed, sago pondweed |
|
| Taxaceae |
Taxus canadensis Marshall |
American yew, Canadian yew, ground-hemlock |
|
| Ranunculaceae |
Thalictrum dasycarpum Fisch. & Avé-Lall. |
purple meadow-rue, tall meadow-rue |
|
| Cupressaceae |
Thuja occidentalis L. |
eastern arborvitae, northern white-cedar |
|
| Hypericaceae |
Triadenum fraseri (Spach) Gleason |
bog St. John's-wort, Fraser's marsh St. John's-wort |
|
| Primulaceae |
Trientalis borealis Raf. subsp. borealis |
American starflower |
|
| Fabaceae |
Trifolium hybridum L. |
alsike clover |
|
| Liliaceae |
Trillium grandiflorum (Michx.) Salisb. |
big white trillium, great white trillium, large-flowered trillium, snow trillium, white trillium, white wake-robin |
|