| Scientific Name | Common Name | Global Rank | State Rank | State Status | Proposed State Status | Federal Status |
| Acalypha deamii | Three-seeded Mercury | G4? | SX | N | PX | |
| Aconitum reclinatum | White Monkshood | G3 | S1 | PE | PE | |
| Aconitum uncinatum | Blue Monkshood | G4 | S2 | PT | PT | |
| Acorus americanus | Sweet Flag | G5 | S1 | PE | PE | |
| Adiantum aleuticum | Aleutian Maidenhair Fern | G5? | SNR | TU | TU | |
| Aeschynomene virginica | Sensitive Joint-vetch | G2 | SX | PX | PX | |
| Agalinis auriculata | Eared False-foxglove | G3 | S1 | PE | PE | |
| Agalinis decemloba | Blue-ridge False-foxglove | G4Q | SX | PX | PX | |
| Agalinis paupercula | Small-flowered False-foxglove | G5 | S1 | PE | PE | |
| Ageratina aromatica | Small White-snakeroot | G5 | S3 | N | PR | |
| Agrostis altissima | Tall Bentgrass | G4 | SX | PX | PX | |
| Aletris farinosa | Colic-root | G5 | S1 | TU | PE | |
| Alisma triviale | Northern Water-plantain | G5 | S1 | PE | PE | |
| Alnus viridis | Mountain Alder | G5 | S1 | PE | PE | |
| Alopecurus aequalis | Short-awn Foxtail | G5 | S3 | N | PT | |
| Amaranthus cannabinus | Waterhemp Ragweed | G5 | S3 | PR | PR | |
| Amelanchier bartramiana | Oblong-fruited Serviceberry | G5 | S1 | PE | PE | |
| Amelanchier canadensis | Serviceberry | G5 | S1 | N | PE | |
| Amelanchier humilis | Serviceberry | G5 | S1 | TU | PE | |
| Amelanchier obovalis | Coastal Juneberry | G4G5 | S1 | TU | PE | |
| Amelanchier sanguinea | Roundleaf Serviceberry | G5 | S2 | TU | PE | |
| Ammannia coccinea | Scarlet Ammannia | G5 | S2 | PE | PT | |
| Ammophila breviligulata | American Beachgrass | G5 | S2 | PT | PT | |
| Andromeda polifolia | Bog-rosemary | G5 | S3 | PR | PR | |
| Andropogon glomeratus | Bushy Bluestem | G5 | S3 | TU | PR | |
| Andropogon gyrans | Elliott's Beardgrass | G5 | S3 | N | PR | |
| Anemone cylindrica | Long-fruited Anemone | G5 | S1 | PE | PE | |
| Antennaria solitaria | Single-headed Pussy-toes | G5 | S1 | TU | PE | |
| Antennaria virginica | Shale Barren Pussytoes | G4 | S3 | N | PR | |
| Aplectrum hyemale | Puttyroot | G5 | S3 | PR | PR | |
| Arabis hirsuta | Western Hairy Rock-cress | G5 | S1 | TU | PE | |
| Arabis missouriensis | Missouri Rock-cress | G5?Q | S1 | PE | PE | |
| Arabis patens | Spreading Rockcress | G3 | S2 | N | PT | |
| Arceuthobium pusillum | Dwarf Mistletoe | G5 | S2 | PT | PT | |
| Arctostaphylos uva-ursi | Bearberry Manzanita | G5 | SX | PX | PX | |
| Arethusa bulbosa | Swamp-pink | G4 | S1 | PE | PE | |
| Aristida dichotoma var. curtissii | Three-awned Grass | G5T5 | S1S2 | TU | PE | |
| Aristida longespica | | G5 | S4 | N | WATCH | |
| Aristida longespica var. geniculata | Spiked Needlegrass | G5T5? | SU | TU | WATCH | |
| Aristida purpurascens | Arrow-feathered Three Awned | G5 | S2 | PT | PT | |
| Arnica acaulis | Leopard's-bane | G4 | S1 | PE | PE | |
| Artemisia campestris ssp. caudata | Beach Wormwood | G5T5 | S1 | PE | PE | |
| Asclepias rubra | Red Milkweed | G4G5 | SX | PX | PX | |
| Asclepias variegata | White Milkweed | G5 | S1 | TU | PE | |
| Asplenium bradleyi | Bradley's Spleenwort | G4 | S1 | PT | PE | |
| Asplenium pinnatifidum | Lobed Spleenwort | G4 | S3 | N | PR | |
| Asplenium resiliens | Black-stemmed Spleenwort | G5 | S1 | PE | PE | |
| Astragalus canadensis | Canadian Milkvetch | G5 | S2 | N | TU | |
| Astragalus neglectus | Cooper's Milk-vetch | G4 | S1 | PE | PE | |
| Baccharis halimifolia | Eastern Baccharis | G5 | S3 | PR | PR | |
| Baptisia australis | Blue False-indigo | G5 | S2 | N | PT | |
| Bartonia paniculata | Screw-stem | G5 | S3 | N | PR | |
| Berberis canadensis | American Barberry | G3 | SX | PX | PX | |
| Bidens bidentoides | Swamp Beggar-ticks | G3G4 | S1 | PT | PE | |
| Bidens discoidea | Small Beggar-ticks | G5 | S3 | N | PR | |
| Bidens laevis | Beggar-ticks | G5 | S1 | N | PE | |
| Boltonia asteroides | Aster-like Boltonia | G5 | S1 | PE | PE | |
| Bouteloua curtipendula | Tall Gramma | G5 | S2 | PT | PT | |
| Bromus kalmii | Brome Grass | G5 | S3 | N | PT | |
| Buchnera americana | Bluehearts | G5? | SX | PX | PX | |
| Cacalia muehlenbergii | Great Indian-plantain | G4 | S1 | N | PE | |
| Cakile edentula | American Sea-rocket | G5 | S3 | PR | PR | |
| Camassia scilloides | Wild Hyacinth | G4G5 | S1 | PT | PE | |
| Cardamine maxima | Large Toothwort | G5 | S2 | N | PT | |
| Cardamine pratensis var. palustris | Cuckooflower | G5T5 | S1 | PE | PE | |
| Carex adusta | Crowded Sedge | G5 | SX | PX | PX | |
| Carex alata | Broad-winged Sedge | G5 | S2 | PT | PT | |
| Carex aquatilis | Water Sedge | G5 | S2 | PT | PT | |
| Carex atherodes | Awned Sedge | G5 | S1 | PE | PE | |
| Carex aurea | Golden-fruited Sedge | G5 | S1 | PE | PE | |
| Carex backii | Rocky Mountain Sedge | G4 | SX | PX | PX | |
| Carex barrattii | Barratt's Sedge | G4 | SX | PX | PX | |
| Carex bebbii | Bebb's Sedge | G5 | S1 | PE | PE | |
| Carex bicknellii | Bicknell's Sedge | G5 | S1 | PE | PE | |
| Carex brevior | A Sedge | G5? | S2? | N | PT | |
| Carex bullata | Bull Sedge | G5 | S1 | PE | PE | |
| Carex buxbaumii | Brown Sedge | G5 | S3 | TU | PR | |
| Carex careyana | Carey's Sedge | G4G5 | S1 | PE | PE | |
| Carex chordorrhiza | Creeping Sedge | G5 | SX | PX | PX | |
| Carex collinsii | Collin's Sedge | G4 | S2 | PE | PT | |
| Carex conjuncta | | G4G5 | S4 | | WATCH | |
| Carex crawfordii | Crawford's Sedge | G5 | S1 | TU | PE | |
| Carex crinita var. brevicrinis | Short Hair Sedge | G5T5 | S1 | PE | PE | |
| Carex cryptolepis | Northeastern Sedge | G4 | S1 | PT | PE | |
| Carex cumberlandensis | Cumberland Sedge | GNR | SH | | TU | |
| Carex diandra | Lesser Panicled Sedge | G5 | S2 | PT | PT | |
| Carex disperma | Soft-leaved Sedge | G5 | S3 | PR | PR | |
| Carex eburnea | Ebony Sedge | G5 | S1 | PE | PE | |
| Carex flava | Yellow Sedge | G5 | S2 | PT | PT | |
| Carex foenea | A Sedge | G5 | S1 | PE | PE | |
| Carex formosa | Handsome Sedge | G4 | S1 | PE | PE | |
| Carex garberi | Elk Sedge | G5 | S1 | PE | PE | |
| Carex geyeri | Geyer's Sedge | G5 | S1 | PE | PE | |
| Carex haydenii | Cloud Sedge | G5 | S1S2 | TU | PT | |
| Carex hyalinolepis | Shore-line Sedge | G4G5 | SX | PX | PX | |
| Carex lasiocarpa | Slender Sedge | G5 | S3 | PR | PR | |
| Carex limosa | Mud Sedge | G5 | S2 | TU | PT | |
| Carex longii | Long's Sedge | G5 | S2S3 | TU | PT | |
| Carex lupuliformis | False Hop Sedge | G4 | S1 | TU | PE | |
| Carex meadii | Mead's Sedge | G4G5 | S1 | TU | PE | |
| Carex mitchelliana | Mitchell's Sedge | G4 | S1 | PE | PE | |
| Carex oligosperma | Few-seeded Sedge | G5? | S2 | PT | PT | |
| Carex ormostachya | Spike Sedge | G4 | S2 | N | PT | |
| Carex pauciflora | Few-flowered Sedge | G5 | S1 | PE | PE | |
| Carex paupercula | Bog Sedge | G5 | S3 | PT | PR | |
| Carex polymorpha | Variable Sedge | G3 | S2 | PE | PT | |
| Carex prairea | Prairie Sedge | G5? | S2 | PT | PT | |
| Carex pseudocyperus | Cyperus-like Sedge | G5 | S1 | PE | PE | |
| Carex retrorsa | Backward Sedge | G5 | S1 | PE | PE | |
| Carex richardsonii | Richardson's Sedge | G4 | S1 | N | PE | |
| Carex roanensis | Roan Mountain Sedge | G3 | S1 | | TU | |
| Carex sartwellii | Sartwell's Sedge | G4G5 | SX | PX | PX | |
| Carex schweinitzii | Schweinitz's Sedge | G3G4 | S1 | PT | PE | |
| Carex shortiana | Sedge | G5 | S3 | N | PR | |
| Carex siccata | A Sedge | G5 | S2 | N | PE | |
| Carex sprengelii | Sedge | G5? | S3 | N | PR | |
| Carex sterilis | Sterile Sedge | G4 | S1 | PT | PE | |
| Carex styloflexa | | G4G5 | S4 | | WATCH | |
| Carex tetanica | A Sedge | G4G5 | S2 | PT | PT | |
| Carex tonsa | | G5T4T5 | S4 | | WATCH | |
| Carex typhina | Cattail Sedge | G5 | S2 | PE | PT | |
| Carex viridula | Green Sedge | G5 | S1 | PE | PE | |
| Carex wiegandii | Wiegands Sedge | G4 | S1 | PT | PT | |
| Carya laciniosa | Shellbark Hickory | G5 | S3S4 | N | WATCH | |
| Castilleja coccinea | Scarlet Indian-paintbrush | G5 | S2 | TU | PT | |
| Cerastium arvense var. villosissimum | Serpentine Chickweed | G5T1Q | S1 | PE | PE | |
| Chamaecyparis thyoides | Atlantic White Cedar | G4 | SX | PX | PX | |
| Chamaesyce polygonifolia | Small Sea-side Spurge | G5? | S2 | PT | PT | |
| Chasmanthium latifolium | Wild Oat | G5 | S1 | TU | PE | |
| Chasmanthium laxum | Slender Sea-oats | G5 | S1 | PE | PE | |
| Chenopodium capitatum | Strawberry Goosefoot | G5 | SH | TU | PE | |
| Chenopodium foggii | Fogg's Goosefoot | G3Q | S1 | PE | PE | |
| Chionanthus virginicus | Fringe-tree | G5 | S3 | N | PT | |
| Chrysogonum virginianum | Green-and-gold | G5 | S1 | PE | PE | |
| Chrysopsis mariana | Maryland Golden-aster | G5 | S1 | PT | PE | |
| Cimicifuga americana | Mountain Bugbane | G4 | S3 | PT | PR | |
| Cirsium horridulum | Horrible Thistle | G5 | S1 | PE | PE | |
| Cladium mariscoides | Twig Rush | G5 | S2 | PE | PE | |
| Clematis viorna | Vase-vine Leather-flower | G5 | S1 | PE | PE | |
| Clethra acuminata | Mountain Pepper-bush | G4 | S1 | PE | PE | |
| Clitoria mariana | Butterfly-pea | G5 | S1 | PE | PE | |
| Coeloglossum viride | Long-bracted Green Orchid | G5 | SH | TU | PE | |
| Collinsia verna | Spring Blue-eyed Mary | G5 | S4 | PR | WATCH | |
| Commelina erecta | Slender Day-flower | G5 | SX | PX | PX | |
| Commelina virginica | Virginia Day-flower | G5 | SX | PX | PX | |
| Conioselinum chinense | Hemlock-parsley | G5 | S1 | PE | PE | |
| Conoclinium coelestinum | Mistflower | G5 | S4 | N | WATCH | |
| Corallorhiza wisteriana | Spring Coral-root | G5 | S1 | TU | PE | |
| Coreopsis rosea | Pink Tickseed | G3 | SX | PX | PX | |
| Corydalis aurea | Golden Corydalis | G5 | S1 | N | PE | |
| Crassula aquatica | Water Pigmy-weed | G5 | SX | PX | PX | |
| Crataegus brainerdii | Brainerd's Hawthorne | G5 | SU | TU | TU | |
| Crataegus dilatata | A Hawthorn | G4 | SU | N | TU | |
| Crataegus mollis | Downy Hawthorne | G5 | SU | TU | TU | |
| Crataegus pennsylvanica | Red-fruited Hawthorn | G3Q | S2S3 | N | TU | |
| Critesion pusillum | Little Barley | G5 | SH | PX | PX | |
| Crotonopsis elliptica | Elliptical Rushfoil | G5 | SX | PX | PX | |
| Cryptogramma stelleri | Slender Rock-brake | G5 | S1 | PE | PE | |
| Cuscuta campestris | Dodder | G5 | S2 | N | PT | |
| Cuscuta cephalanthi | Button-bush Dodder | G5 | S2 | TU | PT | |
| Cuscuta compacta | Dodder | G5 | S2 | N | PT | |
| Cuscuta coryli | Hazel Dodder | G5? | SH | TU | PT | |
| Cuscuta pentagona | Field Dodder | G5 | S2 | N | PT | |
| Cuscuta polygonorum | Smartweed Dodder | G5 | S2 | TU | PT | |
| Cymophyllus fraserianus | Fraser's Sedge | G4 | S1 | PE | PE | |
| Cynanchum laeve | Smooth Swallow-wort | G5 | S1 | PE | PE | |
| Cynoglossum boreale | Northern Hound's-tongue | G5T4T5 | SH | PX | PX | |
| Cyperus diandrus | Umbrella Flatsedge | G5 | S2 | PE | PE | |
| Cyperus houghtonii | Houghton's Flatsedge | G4? | S1 | PE | PE | |
| Cyperus lancastriensis | Many-flowered Umbrella Sedge | G5 | S2 | N | PT | |
| Cyperus refractus | Reflexed Flatsedge | G5 | S1 | PE | PE | |
| Cyperus retrorsus | Retrorse Flatsedge | G5 | SH | PE | PX | |
| Cyperus schweinitzii | Schweinitz's Flatsedge | G5 | S2 | PR | PR | |
| Cypripedium calceolus var. parviflorum | Small Yellow Lady's-slipper | G5 | S1 | PE | PE | |
| Cypripedium candidum | Small White Lady's-slipper | G4 | SX | PX | PX | |
| Cypripedium reginae | Showy Lady's-slipper | G4 | S2 | PT | PT | |
| Cystopteris laurentiana | Laurentian Bladder-fern | G3 | S1 | TU | PE | |
| Cystopteris tennesseensis | Bladder Fern | G5 | S1 | N | TU | |
| Delphinium exaltatum | Tall Larkspur | G3 | S1 | PE | PE | |
| Deschampsia cespitosa | Tufted Hairgrass | G5 | S3 | N | PT | |
| Desmodium glabellum | Tall Tick-trefoil | G5 | SU | TU | TU | |
| Desmodium laevigatum | Smooth Tick-trefoil | G5 | SU | N | TU | |
| Desmodium nuttallii | Nuttalls' Tick-trefoil | G5 | S2 | TU | TU | |
| Desmodium obtusum | Stiff Tick-trefoil | G4G5 | SU | N | TU | |
| Desmodium sessilifolium | Sessile-leaved Tick-trefoil | G5 | SX | PX | PX | |
| Desmodium viridiflorum | Velvety Tick-trefoil | G5? | SU | N | TU | |
| Diarrhena americana | American Beakgrain | G4G5 | S1 | N | PE | |
| Dicentra eximia | Wild Bleeding-hearts | G4 | S1 | PE | PE | |
| Diphasiastrum sabinifolium | Fir Clubmoss | G4 | SX | PX | PX | |
| Dodecatheon meadia | Common Shooting-star | G5 | S1 | PE | PE | |
| Dodecatheon radicatum | Jeweled Shooting-star | GNR | S2 | PT | PT | |
| Draba reptans | Carolina Whitlow-grass | G5 | SH | PX | PX | |
| Dryopteris campyloptera | Mountain Wood Fern | G5 | S1 | PE | PE | |
| Dryopteris celsa | Log Fern | G4 | S1 | N | PE | |
| Dryopteris clintoniana | Clinton's Wood Fern | G5 | S2 | N | PT | |
| Echinacea laevigata | Smooth Coneflower | G2G3 | SX | PX | PX | |
| Echinochloa walteri | Walter's Barnyard-grass | G5 | S1 | PE | PE | |
| Elatine americana | Long-stemmed Water-wort | G4 | SU | PX | PE | |
| Eleocharis caribaea | Capitate Spike-rush | G4G5 | S1 | PE | PE | |
| Eleocharis compressa | Flat-stemmed Spike-rush | G4 | S1 | PE | PE | |
| Eleocharis elliptica | Slender Spike-rush | G5 | S2 | PE | PE | |
| Eleocharis intermedia | Matted Spike-rush | G5 | S2 | PT | PT | |
| Eleocharis obtusa var. peasei | Wrights Spike Rush | G5TNR | S1 | PE | PE | |
| Eleocharis olivacea | Capitate Spike-rush | G5 | S4 | PR | WATCH | |
| Eleocharis parvula | Little-spike Spike-rush | G5 | S1 | PE | PE | |
| Eleocharis pauciflora var. fernaldii | Few-flowered Spike-rush | G5TNRQ | S1 | PE | PE | |
| Eleocharis quadrangulata | Four-angled Spike-rush | G4 | S1 | PE | PE | |
| Eleocharis robbinsii | Robbins' Spike-rush | G4G5 | S2 | PT | PT | |
| Eleocharis rostellata | Beaked Spike-rush | G5 | S1 | PE | PE | |
| Eleocharis tenuis var. verrucosa | Slender Spike-rush | G5T3T5 | S1 | PE | PE | |
| Eleocharis tricostata | Three-ribbed Spike-rush | G4 | SX | PX | PX | |
| Eleocharis tuberculosa | Long-tubercled Spike-rush | G5 | S1 | PX | PE | |
| Elephantopus carolinianus | Elephant's Foot | G5 | S3 | PE | PR | |
| Ellisia nyctelea | Ellisia | G5 | S2 | PT | PT | |
| Elodea schweinitzii | Schweinitz's Waterweed | GHQ | SH | PX | UXT | |
| Elymus trachycaulus | Slender Wheatgrass | G5 | S3 | N | TU | |
| Epilobium palustre | Marsh Willow-herb | G5 | S1 | TU | TU | |
| Epilobium strictum | Downy Willow-herb | G5? | S3 | PE | PR | |
| Equisetum variegatum | Variegated Horsetail | G5 | S1 | PE | PE | |
| Equisetum x ferrissii | Scouring-rush | GNA | S1 | N | PE | |
| Erianthus giganteus | Sugar Cane Plumegrass | G5 | SX | PX | PX | |
| Erigenia bulbosa | Harbinger-of-spring | G5 | S4 | PT | PR | |
| Eriocaulon decangulare | Ten-angle Pipewort | G5 | SX | PX | PX | |
| Eriocaulon parkeri | Parker's Pipewort | G3 | SX | PX | PX | |
| Eriophorum gracile | Slender Cotton-grass | G5 | S1 | PE | PE | |
| Eriophorum tenellum | Rough Cotton-grass | G5 | S1 | PE | PE | |
| Eriophorum viridicarinatum | Thin-leaved Cotton-grass | G5 | S2 | PT | PT | |
| Eryngium aquaticum | Marsh Eryngo | G4 | SX | PX | PX | |
| Erythronium albidum | White Trout-lily | G5 | S3 | N | TU | |
| Eupatorium album | White Thoroughwort | G5 | SH | PX | PX | |
| Eupatorium godfreyanum | Vasey's Eupatorium | G4 | S1S2 | N | PT | |
| Eupatorium leucolepis | White-bracted Thoroughwort | G5 | SX | PX | PX | |
| Eupatorium rotundifolium | A Eupatorium | G5 | S3 | TU | TU | |
| Euphorbia ipecacuanhae | Wild Ipecac | G5? | S1 | PE | PE | |
| Euphorbia obtusata | Blunt-leaved Spurge | G5 | S1 | PX | PE | |
| Euphorbia purpurea | Glade Spurge | G3 | S1 | PE | PE | |
| Eurybia radula | Rough-leaved Aster | G5 | S2 | N | PT | |
| Eurybia spectabilis | Low Showy Aster | G5 | S1 | PE | PE | |
| Euthamia tenuifolia | Grass-leaved Goldenrod | G5 | S1 | PT | PT | |
| Festuca paradoxa | Cluster Fescue | G5 | S1 | PE | PE | |
| Filipendula rubra | Queen-of-the-prairie | G4G5 | S1S2 | TU | TU | |
| Fimbristylis annua | Annual Fimbry | G5 | S2 | PT | PT | |
| Fimbristylis puberula | Hairy Fimbry | G5 | SX | PX | PX | |
| Fraxinus profunda | Pumpkin Ash | G4 | S1 | N | PE | |
| Fraxinus quadrangulata | Blue Ash | G5 | S1 | N | PE | |
| Galactia regularis | Eastern Milk-pea | G5 | SX | PX | PX | |
| Galactia volubilis | Downy Milk-pea | G5 | SX | PX | PX | |
| Galium labradoricum | Labrador Marsh Bedstraw | G5 | S1 | PE | PE | |
| Galium latifolium | Purple Bedstraw | G5 | S3 | N | TU | |
| Galium trifidum | Marsh Bedstraw | G5 | S2 | N | PR | |
| Gaultheria hispidula | Creeping Snowberry | G5 | S3 | PR | PR | |
| Gaylussacia brachycera | Box Huckleberry | G3 | S1 | PT | PE | |
| Gaylussacia dumosa | Dwarf Huckleberry | G5 | SH | PE | PE | |
| Gentiana alba | Yellow Gentian | G4 | SH | TU | PX | |
| Gentiana catesbaei | Elliott's Gentian | G5 | SX | PX | PX | |
| Gentiana saponaria | Soapwort Gentian | G5 | S1S2 | TU | PE | |
| Gentiana villosa | Striped Gentian | G4 | S1 | TU | PE | |
| Gentianopsis virgata | Lesser Fringed Gentian | G5 | SX | PX | PX | |
| Geranium bicknellii | Cranesbill | G5 | S1 | PE | PE | |
| Glyceria obtusa | Blunt Manna-grass | G5 | S1 | PE | PE | |
| Gnaphalium sylvaticum | Cudweed | G4 | SH | N | TU | |
| Goodyera repens | Lesser Rattlesnake-plantain | G5 | S2 | N | PX | |
| Goodyera tesselata | Checkered Rattlesnake-plantain | G5 | S1 | TU | PT | |
| Gratiola aurea | Golden Hedge-hyssop | G5 | S1 | TU | PE | |
| Gymnocarpium appalachianum | Appalachian Oak Fern | G3 | S1 | TU | PE | |
| Gymnocarpium x heterosporum | A Fern Hybrid (Sterile Triploid) | GNA | SX | N | PX | |
| Gymnopogon ambiguus | Broad-leaved Beardgrass | G4 | SX | PE | PX | |
| Helianthemum bicknellii | Bicknell's Hoary Rockrose | G5 | S2 | PE | PE | |
| Helianthemum propinquum | Low Rockrose | G4 | S1S3 | N | TU | |
| Helianthus angustifolius | Swamp Sunflower | G5 | SX | PX | PX | |
| Helianthus hirsutus | Sunflower | G5 | S2 | N | TU | |
| Helianthus microcephalus | Small Wood Sunflower | G5 | S4 | N | WATCH | |
| Helianthus occidentalis | Sunflower | G5 | SH | N | PX | |
| Heteranthera multiflora | Multiflowered Mud-plantain | G4 | S1 | PE | PE | |
| Hieracium traillii | Maryland Hawkweed | G4 | S1 | PE | PE | |
| Hieracium umbellatum | Umbellate Hawkweed | G5 | S1 | N | PE | |
| Hierochloe hirta ssp. arctica | Common Northern Sweet Grass | G5T5 | S1 | N | PE | |
| Hierochloe odorata | Vanilla Sweet-grass | G4G5 | SX | PE | PX | |
| Hottonia inflata | American Featherfoil | G4 | SX | PX | PX | |
| Houstonia purpurea var. purpurea | Purple Bluets | G5T5 | S1 | TU | TU | |
| Houstonia serpyllifolia | Creeping Bluets | G4? | S1 | N | PE | |
| Huperzia porophila | Rock Clubmoss | G4 | S1 | PE | PE | |
| Hydrastis canadensis | Golden-seal | G4 | S4 | PV | PV | |
| Hydrocotyle umbellata | Many-flowered Pennywort | G5 | SH | PX | PX | |
| Hydrophyllum macrophyllum | Large-leaved Waterleaf | G5 | S4 | PE | WATCH | |
| Hypericum adpressum | Creeping St. John's-wort | G3 | SX | PX | PX | |
| Hypericum crux-andreae | St Peter's-wort | G5 | SX | PX | PX | |
| Hypericum densiflorum | Bushy St. John's-wort | G5 | S3 | PT | PR | |
| Hypericum denticulatum | Coppery St. John's-wort | G5 | SX | PX | PX | |
| Hypericum drummondii | Nits-and-lice | G5 | SX | TU | PX | |
| Hypericum gymnanthum | Clasping-leaved St. John's-wort | G4 | S1 | PX | PE | |
| Hypericum majus | Larger Canadian St. John's-wort | G5 | S2 | PT | PT | |
| Hypericum stragulum | St Andrew's-cross | G4 | S2 | N | PT | |
| Ilex glabra | Ink-berry | G5 | SX | PX | PX | |
| Ilex opaca | American Holly | G5 | S2 | PT | PT | |
| Iodanthus pinnatifidus | Purple Rocket | G5 | S1 | PE | PE | |
| Iris cristata | Crested Dwarf Iris | G5 | S1 | PE | PE | |
| Iris prismatica | Slender Blue Iris | G4G5 | S1 | PE | PE | |
| Iris verna | Dwarf Iris | G5 | S1 | PE | PE | |
| Iris virginica | Virginia Blue Flag | G5 | S2 | N | PE | |
| Isoetes valida | Quillwort | G4? | S1S3 | N | PR | |
| Isoetes x brittonii | Quillwort | GNA | S1S2 | N | TU | |
| Isotria medeoloides | Small-whorled Pogonia | G2 | S1 | PE | PE | LT |
| Itea virginica | Virginia Willow | G4 | S1 | PX | PE | |
| Juncus alpinoarticulatus ssp. nodulosus | Richardson's Rush | G5T5? | S2 | PT | PT | |
| Juncus arcticus var. littoralis | Baltic Rush | G5T5 | S2 | PT | PT | |
| Juncus biflorus | Grass-leaved Rush | G5 | S2 | TU | PT | |
| Juncus brachycarpus | Short-fruited Rush | G4G5 | S1 | PE | PE | |
| Juncus brachycephalus | Small-headed Rush | G5 | S2 | PT | PT | |
| Juncus debilis | Weak Rush | G5 | S3 | N | PT | |
| Juncus dichotomus | Forked Rush | G5 | S1 | PE | PE | |
| Juncus filiformis | Thread Rush | G5 | S3 | PR | PR | |
| Juncus greenei | Greene's Rush | G5 | SX | PX | PX | |
| Juncus gymnocarpus | Coville's Rush | G4 | S4 | PR | WATCH | |
| Juncus militaris | Bayonet Rush | G4 | S1 | PE | PE | |
| Juncus scirpoides | Scirpus-like Rush | G5 | S1 | PE | PE | |
| Juncus torreyi | Torrey's Rush | G5 | S2S4 | PT | PE | |
| Juniperus communis | Common Juniper | G5 | S2 | N | TU | |
| Koeleria macrantha | Junegrass | G5 | SX | PX | PX | |
| Lactuca hirsuta | Downy Lettuce | G5? | S3 | N | TU | |
| Lathyrus japonicus | Beach Peavine | G5 | S2 | PT | PT | |
| Lathyrus ochroleucus | Wild-pea | G4G5 | S1 | PT | PT | |
| Lathyrus palustris | Vetchling | G5 | S1 | TU | PE | |
| Lathyrus venosus | Veiny Pea | G5 | S2 | N | PE | |
| Lechea minor | Thyme-leaved Pinweed | G5 | S1S3 | N | PE | |
| Lechea villosa | | G5 | S3S4 | | WATCH | |
| Ledum groenlandicum | Common Labrador-tea | G5 | S3 | PR | PR | |
| Leiophyllum buxifolium | Sand-myrtle | G4 | SX | PX | PX | |
| Lemna obscura | Little Water Duckweed | G5 | SX | PX | PX | |
| Lemna perpusilla | Minute Duckweed | G5 | S1S3 | N | TU | |
| Lemna turionifera | A Duckweed | G5 | S1S3 | TU | TU | |
| Lemna valdiviana | Pale Duckweed | G5 | SH | PX | PX | |
| Lespedeza angustifolia | Narrowleaf Bushclover | G5 | S1 | PE | PE | |
| Lespedeza stuevei | Tall Bush Clover | G4? | SX | PX | PX | |
| Leucothoe racemosa | Swamp Dog-hobble | G5 | S2S3 | TU | PT | |
| Liatris scariosa | Round-head Gayfeather | G5? | S2 | N | PT | |
| Ligusticum canadense | Nondo Lovage | G4 | SH | PE | PE | |
| Limosella australis | Awl-shaped Mudwort | G4G5 | SX | PX | PX | |
| Linnaea borealis | Twinflower | G5 | S1 | PT | PE | |
| Linum intercursum | Sandplain Wild Flax | G4 | S1 | PE | PE | |
| Linum sulcatum | Grooved Yellow Flax | G5 | S1 | PE | PE | |
| Lipocarpha micrantha | Common Hemicarpa | G5 | S1 | PE | PE | |
| Listera australis | Southern Twayblade | G4 | S1 | PE | PE | |
| Listera cordata | Heart-leaved Twayblade | G5 | S1 | PE | PE | |
| Listera smallii | Kidney-leaved Twayblade | G4 | S1 | PE | PE | |
| Lithospermum canescens | Hoary Puccoon | G5 | S2 | N | TU | |
| Lithospermum caroliniense | Hispid Gromwell | G4G5 | S1 | PE | PE | |
| Lithospermum latifolium | American Gromwell | G4 | S4 | PE | WATCH | |
| Lobelia dortmanna | Water Lobelia | G4G5 | S2 | PT | PT | |
| Lobelia kalmii | Brook Lobelia | G5 | S1 | PE | PE | |
| Lobelia nuttallii | Nuttall's Lobelia | G4G5 | SX | PX | PX | |
| Lobelia puberula | Downy Lobelia | G5 | S1 | PE | PE | |
| Lonicera hirsuta | Hairy Honeysuckle | G4G5 | S1 | TU | PE | |
| Lonicera oblongifolia | Swamp Fly Honeysuckle | G4 | S1 | PE | PE | |
| Lonicera villosa | Mountain Fly Honeysuckle | G5 | S1 | PE | PE | |
| Ludwigia decurrens | Upright Primrose-willow | G5 | S1 | PE | PE | |
| Ludwigia polycarpa | False Loosestrife Seedbox | G4 | S1 | PE | PE | |
| Ludwigia sphaerocarpa | Spherical-fruited Seedbox | G5 | SX | PX | PX | |
| Lupinus perennis | Lupine | G5 | S3 | PR | PR | |
| Luzula bulbosa | Southern Wood-rush | G5 | S1 | TU | PE | |
| Lycopodiella alopecuroides | Foxtail Clubmoss | G5 | S1 | PE | PE | |
| Lycopodiella appressa | Southern Bog Clubmoss | G5 | S2 | PT | PT | |
| Lycopodiella margueritae | A Clubmoss | G2 | S1 | N | PE | |
| Lycopodiella x copelandii | | GNA | S1 | N | WATCH | |
| Lycopus rubellus | Bugleweed | G5 | S1 | PE | PE | |
| Lyonia mariana | Stagger-bush | G5 | S1 | PE | PE | |
| Lysimachia hybrida | Lance-leaf Loosestrife | G5 | S1 | N | PT | |
| Lythrum alatum | Winged-loosestrife | G5 | S1 | TU | PE | |
| Magnolia tripetala | Umbrella Magnolia | G5 | S2 | PT | PR | |
| Magnolia virginiana | Sweet Bay Magnolia | G5 | S2 | PT | PT | |
| Malaxis bayardii | Bayard's Malaxis | G1G2 | S1 | PR | PE | |
| Malaxis monophyllos var. brachypoda | White Adder's-mouth | G4Q | S1 | TU | PE | |
| Marshallia grandiflora | Large-flowered Marshallia | G2 | S1 | PE | PE | |
| Matelea obliqua | Oblique Milkvine | G4? | S1 | PE | PE | |
| Meehania cordata | Heartleaf Meehania | G5 | S1 | TU | PE | |
| Megalodonta beckii | Beck's Water-marigold | G4G5 | S1 | PE | PE | |
| Melica nitens | Three-flowered Melic-grass | G5 | S2 | PT | PT | |
| Menziesia pilosa | Minniebush | G4G5 | S3 | PR | PR | |
| Micranthemum micranthemoides | Nuttall's Mud-flower | GH | SX | PX | PX | |
| Minuartia glabra | Appalachian Sandwort | G4 | S2 | PT | PT | |
| Mitella nuda | Naked Bishop's-cap | G5 | S1 | PE | PE | |
| Monarda punctata | Spotted Bee-balm | G5 | SH | PE | PE | |
| Montia chamissoi | Chamisso's Miner's-lettuce | G5 | S1 | PE | PE | |
| Muhlenbergia capillaris | Short Muhly | G5 | SX | PX | PX | |
| Muhlenbergia uniflora | Fall Dropseed Muhly | G5 | S2 | PE | PT | |
| Myrica gale | Sweet-gale | G5 | S2 | PT | PT | |
| Myriophyllum farwellii | Farwell's Water-milfoil | G5 | S3 | PE | PR | |
| Myriophyllum heterophyllum | Broad-leaved Water-milfoil | G5 | S4 | PE | SP | |
| Myriophyllum sibiricum | Northern Water-milfoil | G5 | S1 | PE | PE | |
| Myriophyllum tenellum | Slender Water-milfoil | G5 | S2 | PT | PT | |
| Myriophyllum verticillatum | Whorled Water-milfoil | G5 | S1 | PE | PE | |
| Nuphar microphylla | Yellow Cowlily | G5T4T5 | S1 | TU | PE | |
| Nymphoides cordata | Floating-heart | G5 | S2 | PT | PT | |
| Oclemena nemoralis | Bog Aster | G5 | S1 | PE | PE | |
| Oenothera argillicola | Shale-barren Evening-primrose | G3G4 | S2 | PT | PT | |
| Oenothera oakesiana | Evening-primrose | G4G5Q | S2 | N | PT | |
| Onosmodium molle var. hispidissimum | False Gromwell | G4G5T4 | S1 | PE | PE | |
| Onosmodium virginianum | Virginia False-gromwell | G4 | SH | PX | PX | |
| Ophioglossum engelmannii | Limestone Adder's-tongue | G5 | S1 | PE | PE | |
| Ophioglossum vulgatum | Adder's Tongue | G5 | S4 | PX | WATCH | |
| Opuntia humifusa | Prickly-pear Cactus | G5 | S3 | PR | PR | |
| Orontium aquaticum | Golden Club | G5 | S4 | PR | WATCH | |
| Oryzopsis pungens | Slender Mountain-ricegrass | G5 | S2 | PE | PE | |
| Oxydendrum arboreum | Sourwood | G5 | S3S4 | TU | PR | |
| Oxypolis rigidior | Stiff Cowbane | G5 | S2 | TU | PT | |
| Panicum amarum var. amarulum | Southern Sea-beach Panic-grass | G5T3T5 | SH | PE | PE | |
| Panicum annulum | Serpentine Panic-grass | GNR | S2 | TU | PT | |
| Panicum bicknellii | Bicknell's Panic Grass | G4?Q | S1S3 | TU | TU | |
| Panicum boreale | Panic-grass | G5 | SH | TU | TU | |
| Panicum commonsianum var. commonsianum | Commons' Panic-grass | G5TNR | SH | TU | PX | |
| Panicum commonsianum var. euchlamydeum | Cloaked Panic-grass | G5TNR | S2 | PR | PE | |
| Panicum flexile | Wiry Witchgrass | G5 | S2S3 | TU | PT | |
| Panicum laxiflorum | Lax-flower Witchgrass | G5 | S1 | N | PE | |
| Panicum leibergii | Leiberg's Panic-grass | G5 | SX | PX | PX | |
| Panicum longifolium | Long-leaf Panic-grass | G4 | S1 | TU | PE | |
| Panicum lucidum | Shining Panic-grass | GNR | S1 | TU | PE | |
| Panicum oligosanthes | Heller's Witchgrass | G5 | S3 | N | PT | |
| Panicum polyanthes | Panic-grass | GNR | S4 | N | WATCH | |
| Panicum recognitum | Fernald's Panic-grass | G4 | SH | TU | TU | |
| Panicum scoparium | Velvety Panic-grass | G5 | S1 | PE | PE | |
| Panicum spretum | Eaton's Witchgrass | G5 | S1 | PX | PE | |
| Panicum tuckermanii | Tuckerman's Panic-grass | G3G5 | S2 | PT | PT | |
| Panicum villosissimum var. villosissimum | Long-haired Panic-grass | G5T5 | SH | TU | PE | |
| Panicum xanthophysum | Slender Panic-grass | G5 | S1 | PE | PE | |
| Panicum yadkinense | Yadkin River Panic-grass | G4Q | S1S3 | TU | PT | |
| Parnassia glauca | Carolina Grass-of-parnassus | G5 | S2 | PE | PE | |
| Paronychia fastigiata var. nuttallii | Forked-chickweed | G5T3T5 | S1S2 | TU | PE | |
| Parthenium integrifolium | American Fever-few | G5 | S1 | TU | PE | |
| Passiflora lutea | Passion-flower | G5 | S2 | PE | PT | |
| Paxistima canbyi | Canby's Mountain-lover | G2 | S1 | PE | PE | |
| Pedicularis lanceolata | Swamp Lousewort | G5 | S1S2 | N | PE | |
| Penstemon canescens | Beard-tongue | G4 | S3 | N | TU | |
| Penstemon laevigatus | Beard-tongue | G5 | S3 | N | TU | |
| Phaseolus polystachios | Wild Kidney Bean | G5 | S1S2 | N | PE | |
| Phemeranthus teretifolius | Round-leaved Fame-flower | G4 | S2 | PT | PT | |
| Phlox ovata | Mountain Phlox | G4 | S1 | PE | PE | |
| Phlox pilosa | Downy Phlox | G5 | S1S2 | TU | PE | |
| Phlox subulata ssp. brittonii | Moss Pink | G5T4? | S1 | PE | PE | |
| Phoradendron leucarpum | Christmas Mistletoe | G5 | SX | PX | PX | |
| Phragmites australis ssp. americanus | | G5T4 | S1 | | PE | |
| Phyllanthus caroliniensis | Carolina Leaf-flower | G5 | S1 | PE | PE | |
| Physalis virginiana | Virginia Ground-cherry | G5 | S1S2 | TU | PE | |
| Pinus echinata | Short-leaf Pine | G5 | S1S2 | N | PT | |
| Piptochaetium avenaceum | Blackseed Needlegrass | G5 | S1 | N | PE | |
| Platanthera blephariglottis | White Fringed-orchid | G4G5 | S2S3 | N | PE | |
| Platanthera ciliaris | Yellow-fringed Orchid | G5 | S2 | TU | PT | |
| Platanthera cristata | Crested Yellow Orchid | G5 | SX | PX | PX | |
| Platanthera dilatata | Leafy White Orchid | G5 | S1 | PE | PE | |
| Platanthera hookeri | Hooker's Orchid | G4 | S1 | TU | PE | |
| Platanthera hyperborea | Leafy Northern Green Orchid | G5 | S1 | PE | PE | |
| Platanthera leucophaea | Prairie White-fringed Orchid | G3 | SX | PX | PX | |
| Platanthera peramoena | Purple-fringeless Orchid | G5 | S2 | TU | PT | |
| Pluchea odorata | Shrubby Camphor-weed | G5 | S1 | TU | PE | |
| Poa autumnalis | Autumn Bluegrass | G5 | S1 | PE | PE | |
| Poa languida | Drooping Bluegrass | G3G4Q | S2 | TU | PT | |
| Poa paludigena | Bog Bluegrass | G3 | S3 | PT | PR | |
| Polemonium vanbruntiae | Jacob's-ladder | G3G4 | S1 | PE | PE | |
| Polygala cruciata | Cross-leaved Milkwort | G5 | S1 | PE | PE | |
| Polygala curtissii | Curtis's Milkwort | G5 | S1 | PE | PE | |
| Polygala incarnata | Pink Milkwort | G5 | SH | PE | PE | |
| Polygala lutea | Yellow Milkwort | G5 | SX | PX | PX | |
| Polygala nuttallii | Nuttall's Milkwort | G5 | S3 | N | PE | |
| Polygala polygama | Racemed Milkwort | G5 | S1S2 | TU | PE | |
| Polygonella articulata | Eastern Jointweed | G5 | S1 | TU | PE | |
| Polygonum careyi | Carey's Smartweed | G4 | S1 | PE | PE | |
| Polygonum ramosissimum | Bushy Knotweed | G5 | SH | TU | PX | |
| Polygonum setaceum var. interjectum | A Swamp Smartweed | G5T4 | S2 | PE | PE | |
| Polymnia uvedalia | Leaf-cup | G4G5 | S3 | N | PR | |
| Polystichum braunii | Braun's Holly Fern | G5 | S1 | PE | PE | |
| Populus balsamifera | Balsam Poplar | G5 | S1 | PE | PE | |
| Populus heterophylla | Swamp Cottonwood | G5 | SH | PX | PX | |
| Potamogeton confervoides | Tuckerman's Pondweed | G4 | S2 | PT | PT | |
| Potamogeton filiformis | Slender Pondweed | G5 | SH | TU | PX | |
| Potamogeton friesii | Fries' Pondweed | G4 | S1 | PE | PE | |
| Potamogeton gramineus | Grassy Pondweed | G5 | S1 | PE | PE | |
| Potamogeton hillii | Hill's Pondweed | G3 | S1 | PE | PE | |
| Potamogeton oakesianus | Oakes' Pondweed | G4 | S1S2 | TU | PE | |
| Potamogeton obtusifolius | Blunt-leaved Pondweed | G5 | S1 | PE | PE | |
| Potamogeton praelongus | White-stemmed Pondweed | G5 | S1 | PX | PE | |
| Potamogeton pulcher | Spotted Pondweed | G5 | S1 | PE | PE | |
| Potamogeton richardsonii | Red-head Pondweed | G5 | S3 | PT | PR | |
| Potamogeton strictifolius | Narrow-leaved Pondweed | G5 | SH | PE | PE | |
| Potamogeton tennesseensis | Tennessee Pondweed | G2 | S1 | PE | PE | |
| Potamogeton vaseyi | Vasey's Pondweed | G4 | S1 | PE | PE | |
| Potamogeton zosteriformis | Flat-stem Pondweed | G5 | S2S3 | PR | PR | |
| Potentilla anserina | Silverweed | G5 | S3 | PT | PR | |
| Potentilla fruticosa | Shrubby Cinquefoil | G5 | S1 | PE | PE | |
| Potentilla paradoxa | Bushy Cinquefoil | G5 | S1 | PE | PE | |
| Potentilla tridentata | Three-toothed Cinquefoil | G5 | S1 | PE | PE | |
| Prenanthes racemosa | Glaucous Rattlesnake-root | G5 | SH | PX | PX | |
| Prenanthes serpentaria | Lion's-foot | G5 | S3 | N | PT | |
| Proserpinaca pectinata | Comb-leaved Mermaid-weed | G5 | SX | PX | PX | |
| Prunus alleghaniensis | Alleghany Plum | G4 | S2S3 | N | PT | |
| Prunus maritima | Beach Plum | G4 | S1 | PE | PE | |
| Prunus pumila var. depressa | | G5T5 | S1 | | PE | |
| Prunus pumila var. susquehanae | | G5T4 | S2 | | PT | |
| Ptelea trifoliata | Common Hop-tree | G5 | S2 | PT | PT | |
| Ptilimnium capillaceum | Mock Bishop-weed | G5 | SX | PE | PX | |
| Pycnanthemum clinopodioides | Mountain-mint | G2 | S1S2 | N | PX | |
| Pycnanthemum torrei | Torrey's Mountain-mint | G2 | S1 | PE | PE | |
| Pycnanthemum verticillatum var. pilosum | Hairy Mountain-mint | G5T5 | SH | TU | PX | |
| Pyrola chlorantha | | G5 | S1 | N | PE | |
| Pyrularia pubera | Buffalo-nut | G5 | S3 | PR | PR | |
| Quercus falcata | Southern Red Oak | G5 | S1 | PE | PE | |
| Quercus michauxii | Swamp Chestnut Oak | G5 | S1 | N | PE | |
| Quercus phellos | Willow Oak | G5 | S2 | PE | PE | |
| Quercus shumardii | Shumard's Oak | G5 | S2 | PE | PE | |
| Ranunculus ambigens | | G4 | S3 | N | TU | |
| Ranunculus aquatilis var. diffusus | White Water-crowfoot | G5T5 | S3 | | PR | |
| Ranunculus fascicularis | Tufted Buttercup | G5 | S1S2 | PE | PE | |
| Ranunculus flabellaris | Yellow Water-crowfoot | G5 | S2 | N | PT | |
| Ranunculus flammula | Lesser Spearwort | G5 | SH | TU | PX | |
| Ranunculus hederaceus | Long-stalked Crowfoot | G5 | S1 | PX | PE | |
| Ranunculus pusillus | Spearwort | G5 | S1 | N | PE | |
| Ratibida pinnata | Gray-headed Prairie Coneflower | G5 | S1 | TU | PE | |
| Rhamnus alnifolia | Alder-leaved Buckthorn | G5 | S4 | TU | DL | |
| Rhamnus lanceolata | Lance-leaved Buckthorn | G5 | S1 | PE | PE | |
| Rhexia mariana | Maryland Meadow-beauty | G5 | S1 | PE | PE | |
| Rhododendron atlanticum | Dwarf Azalea | G4G5 | S1 | PE | PE | |
| Rhododendron calendulaceum | Flame Azalea | G5 | SX | PX | PX | |
| Rhynchospora capillacea | Capillary Beaked-rush | G4 | S1 | PE | PE | |
| Rhynchospora fusca | Brown Beaked-rush | G4G5 | SX | PX | PX | |
| Rhynchospora gracilenta | Beaked-rush | G5 | SX | PX | PX | |
| Rhynchospora recognita | Small Globe Beaked-rush | G5? | S1 | TU | PE | |
| Ribes lacustre | Swamp Currant | G5 | S1 | TU | PE | |
| Ribes missouriense | Missouri Gooseberry | G5 | S1 | PE | PE | |
| Ribes triste | Red Currant | G5 | S2 | PT | PT | |
| Rosa blanda | Meadow Rose | G5 | SU | N | TU | |
| Rosa setigera | Prairie Rose | G5 | S1 | N | TU | |
| Rosa virginiana | Virginia Rose | G5 | S1 | TU | TU | |
| Rotala ramosior | Tooth-cup | G5 | S3 | PR | PR | |
| Rubus cuneifolius | Sand Blackberry | G5 | S1 | TU | PE | |
| Rubus setosus | Small Bristleberry | G5 | SH | TU | PE | |
| Rudbeckia fulgida | Eastern Coneflower | G5 | S3 | N | PT | |
| Ruellia caroliniensis | Carolina Petunia | G5 | SX | PX | PX | |
| Ruellia humilis | Fringed-leaved Petunia | G5 | S1 | PE | PE | |
| Ruellia pedunculata | Stalked Wild-petunia | G5 | S1 | N | TU | |
| Ruellia strepens | Limestone Petunia | G4G5 | S2 | PT | PT | |
| Rumex hastatulus | Heart-winged Sorrell | G5 | SX | TU | PX | |
| Sabatia campanulata | Slender Marsh Pink | G5 | SX | PX | PX | |
| Sagittaria calycina var. spongiosa | Long-lobed Arrow-head | G5T4 | S1 | PE | PE | |
| Sagittaria cuneata | Wapatum Arrowhead | G5 | S1 | N | PE | |
| Sagittaria filiformis | An Arrow-head | G4G5 | SX | PX | PX | |
| Sagittaria subulata | Subulate Arrowhead | G4 | S3 | PR | PR | |
| Salix candida | Hoary Willow | G5 | S1 | PT | PE | |
| Salix caroliniana | Carolina Willow | G5 | S1 | N | PE | |
| Salix myricoides | Broad-leaved Willow | G4 | S2 | N | PE | |
| Salix pedicellaris | Bog Willow | G5 | S1 | N | PE | |
| Salix petiolaris | Meadow Willow | G5 | S4 | TU | WATCH | |
| Salix serissima | Autumn Willow | G4 | S2 | PT | PT | |
| Samolus parviflorus | Pineland Pimpernel | G5T5 | S3 | TU | PR | |
| Saxifraga micranthidifolia | Lettuce Saxifrage | G5 | S4 | TU | WATCH | |
| Scheuchzeria palustris | Pod-grass | G5 | S1 | PE | PE | |
| Schizachyrium scoparium var. littorale | Seaside Bluestem | G5T5 | S3 | PR | PR | |
| Schoenoplectus acutus | Hard-stemmed Bulrush | G5 | S2 | PE | PE | |
| Schoenoplectus fluviatilis | River Bulrush | G5 | S3 | PR | PR | |
| Schoenoplectus heterochaetus | Slender Bulrush | G5 | SX | PX | PX | |
| Schoenoplectus smithii | Smith's Bulrush | G5? | S1 | PE | PE | |
| Schoenoplectus subterminalis | Water Bulrush | G4G5 | S3 | N | PR | |
| Schoenoplectus torreyi | Torrey's Bulrush | G5? | S1 | PE | PE | |
| Scirpus ancistrochaetus | Northeastern Bulrush | G3 | S3 | PE | PT | LE |
| Scirpus pedicellatus | Stalked Bulrush | G4 | S1 | PT | PT | |
| Scleria minor | Minor Nutrush | G4 | SH | PE | PE | |
| Scleria muehlenbergii | Reticulated Nutrush | G5 | S1 | PE | PE | |
| Scleria pauciflora | Few Flowered Nutrush | G5 | S2 | PT | PT | |
| Scleria triglomerata | Whip Nutrush | G5 | SH | TU | PE | |
| Scleria verticillata | Whorled Nutrush | G5 | S1 | PE | PE | |
| Scutellaria saxatilis | Rock Skullcap | G3 | S1 | TU | PE | |
| Scutellaria serrata | Showy Skullcap | G4G5 | S1 | PX | PE | |
| Sedum rosea | Roseroot Stonecrop | G5 | S1 | PE | PE | |
| Sedum telephioides | Allegheny Stonecrop | G4 | S3 | PR | PR | |
| Senecio anonymus | Plain Ragwort | G5 | S2 | PR | PR | |
| Senecio antennariifolius | Cat's-paw Ragwort | G4 | S1 | PE | PE | |
| Senecio plattensis | Prairie Ragwort | G5 | SH | TU | PX | |
| Senna marilandica | Wild Senna | G5 | S3 | TU | PR | |
| Sericocarpus linifolius | Narrow-leaved White-topped Aster | G5 | S1 | PE | PE | |
| Shepherdia canadensis | Canada Buffalo-berry | G5 | S1 | PE | PE | |
| Sida hermaphrodita | Sida | G3 | S2 | PE | PE | |
| Sisyrinchium albidum | Blue-eyed Grass | G5? | SH | TU | PX | |
| Sisyrinchium atlanticum | Eastern Blue-eyed Grass | G5 | S1 | PE | PE | |
| Sisyrinchium fuscatum | Sand Blue-eyed Grass | G5? | SH | PX | PX | |
| Smilax pseudochina | Long-stalked Greenbrier | G4G5 | SH | PX | PX | |
| Solidago arguta var. harrisii | Harris' Golden-rod | G5T4 | S1 | PE | PE | |
| Solidago curtisii | Curtis' Golden-rod | G4G5 | S1 | PE | PE | |
| Solidago rigida | Hard-leaved Goldenrod | G5 | S1 | TU | PE | |
| Solidago roanensis | Tenessee Golden-rod | G4G5 | S2 | PR | PR | |
| Solidago simplex ssp. randii var. racemosa | Sticky Golden-rod | G5T3? | S1 | PE | PE | |
| Solidago speciosa var. erecta | Slender Golden-rod | G5 | S1 | PE | PE | |
| Solidago speciosa var. speciosa | Showy Goldenrod | G5T5? | S2 | N | PT | |
| Solidago uliginosa | Bog Goldenrod | G4G5 | S2 | N | PT | |
| Sorbus decora | Showy Mountain-ash | G4G5 | S1 | PE | PE | |
| Sparganium androcladum | Branching Bur-reed | G4G5 | S1 | PE | PE | |
| Sparganium angustifolium | Bur-reed | G5 | S2 | N | PT | |
| Sparganium minimum | Small Bur-reed | G5 | SX | PX | PX | |
| Spiraea betulifolia | Dwarf Spiraea | G5 | S1 | PT | PE | |
| Spiraea virginiana | Virginia Spiraea | G2 | SX | PX | PX | |
| Spiranthes casei | Case's Ladies'-tresses | G4 | S1 | PE | PE | |
| Spiranthes lucida | Shining Ladies'-tresses | G5 | S3 | N | PT | |
| Spiranthes magnicamporum | Ladies'-tresses | G4 | SX | PX | PX | |
| Spiranthes ovalis | October Ladies'-tresses | G5? | S1 | PE | PE | |
| Spiranthes romanzoffiana | Hooded Ladies'-tresses | G5 | S1 | PE | PE | |
| Spiranthes tuberosa | Little Ladies'-tresses | G5 | S1 | TU | PE | |
| Spiranthes vernalis | Spring Ladies'-tresses | G5 | S1 | PE | PE | |
| Sporobolus clandestinus | Rough Dropseed | G5 | S1 | PE | PE | |
| Sporobolus heterolepis | Prairie Dropseed | G5 | S1 | PE | PE | |
| Stachys cordata | Nuttall's Hedge-nettle | G5? | S1 | PE | PE | |
| Stachys hyssopifolia | Hyssop Hedge-nettle | G5 | SH | TU | PX | |
| Stellaria borealis | Mountain Starwort | G5 | S1S2 | N | TU | |
| Stenanthium gramineum | Featherbells | G4G5 | S1S2 | N | TU | |
| Streptopus amplexifolius | White Twisted-stalk | G5 | S1 | PT | PE | |
| Strophostyles umbellata | Wild Bean | G5 | S2 | N | PE | |
| Stylosanthes biflora | Pencilflower | G5 | S2 | TU | PE | |
| Swertia caroliniensis | American Columbo | G5 | S1 | PE | PE | |
| Symphyotrichum boreale | Rush Aster | G5 | S1 | PE | PE | |
| Symphyotrichum depauperatum | Serpentine Aster | G2 | S2 | PT | PT | |
| Symphyotrichum drummondii | Hairy Heart-leaved Aster | G5 | SH | N | PE | |
| Symphyotrichum dumosum | Bushy Aster | G5 | S1 | TU | PE | |
| Symphyotrichum ericoides | White Heath Aster | G5 | S3 | TU | PT | |
| Symphyotrichum novi-belgii | New York Aster | G5 | S2 | PT | PT | |
| Symphyotrichum praealtum | Veiny-lined Aster | G5 | S3 | N | TU | |
| Taenidia montana | Mountain Pimpernel | G3 | S1 | PE | PE | |
| Taxus canadensis | American Yew | G5 | S3S4 | TU | WATCH | |
| Thalictrum coriaceum | Thick-leaved Meadow-rue | G4 | S2 | PE | PT | |
| Thalictrum dasycarpum | Purple Meadow-rue | G5 | S1 | N | TU | |
| Tipularia discolor | Cranefly Orchid | G4G5 | S3 | PR | PR | |
| Toxicodendron rydbergii | Giant Poison-ivy | G5 | S1 | N | PE | |
| Trautvetteria caroliniensis | Carolina Tassel-rue | G5 | S3 | PR | PR | |
| Trichostema setaceum | Blue-curls | G5 | S1 | PE | PE | |
| Trifolium reflexum | Buffalo Clover | G3G4 | SX | PX | PX | |
| Trifolium virginicum | Kate's Mountain Clover | G3 | S1 | PE | PE | |
| Triglochin palustris | Marsh Arrowgrass | G5 | SX | PX | PX | |
| Trillium cernuum | | G5 | S2 | N | PT | |
| Trillium erectum x flexipes | | GNR | S2 | | PT | |
| Trillium flexipes | Declined Trillium | G5 | S2 | TU | PT | |
| Trillium nivale | Snow Trillium | G4 | S3 | PR | PR | |
| Triosteum angustifolium | Horse-gentian | G5 | S1 | TU | PE | |
| Triphora trianthophora | Nodding Pogonia | G3G4 | SH | PE | PE | |
| Triplasis purpurea | Purple Sandgrass | G4G5 | S1 | PE | PE | |
| Tripsacum dactyloides | Eastern Gamma-grass | G5 | S1 | TU | PE | |
| Trisetum spicatum | Narrow False Oats | G5 | S1 | N | PE | |
| Trollius laxus | Spreading Globeflower | G4T3 | S1 | PE | |