| Equisetum arvense | Common Horsetail | Polypodiopsida | Equisetaceae | C |
| Equisetum fluviatile | Swamp Horsetail | Polypodiopsida | Equisetaceae | C |
| Equisetum hyemale affine | Tall Scouring-Rush, Western Scouringrush | Polypodiopsida | Equisetaceae | C |
| Equisetum laevigatum | Smooth Scouring-Rush | Polypodiopsida | Equisetaceae | C |
| Equisetum palustre | Marsh Horsetail | Polypodiopsida | Equisetaceae | C |
| Equisetum pratense | Meadow Horsetail | Polypodiopsida | Equisetaceae | C |
| Equisetum scirpoides | Dwarf Scouring-Rush | Polypodiopsida | Equisetaceae | C |
| Equisetum sylvaticum | Wood Horsetail | Polypodiopsida | Equisetaceae | C |
| Equisetum telmateia braunii | Giant Horsetail | Polypodiopsida | Equisetaceae | TBD |
| Equisetum variegatum | Northern Scouring-Rush | Polypodiopsida | Equisetaceae | C |
| Equisetum x ferrissii | Ferriss's Scouring-Rush, Ferriss's Horsetail | Polypodiopsida | Equisetaceae | C |
| Botrychium ascendens | Upswept Moonwort | Polypodiopsida | Ophioglossaceae | TBD |
| Botrychium crenulatum | Dainty Moonwort | Polypodiopsida | Ophioglossaceae | C |
| Botrychium hesperium | Western Moonwort | Polypodiopsida | Ophioglossaceae | C |
| Botrychium lanceolatum lanceolatum | Triangle Moonwort, Lanceleaf Moonwort | Polypodiopsida | Ophioglossaceae | C |
| Botrychium michiganense | Michigan Moonwort | Polypodiopsida | Ophioglossaceae | C |
| Botrychium minganense | Mingan Moonwort | Polypodiopsida | Ophioglossaceae | C |
| Botrychium montanum | Mountain Moonwort, Western Goblin | Polypodiopsida | Ophioglossaceae | TBD |
| Botrychium neolunaria | Common Moonwort | Polypodiopsida | Ophioglossaceae | C |
| Botrychium pinnatum | Northwestern Moonwort | Polypodiopsida | Ophioglossaceae | C |
| Botrypus virginianus | Rattlesnake Fern | Polypodiopsida | Ophioglossaceae | C |
| Ophioglossum pusillum | Northern Adder's-Tongue | Polypodiopsida | Ophioglossaceae | TBD |
| Sceptridium multifidum | Leathery Grape Fern, Leathery Grapefern | Polypodiopsida | Ophioglossaceae | C |
| Asplenium trichomanes | Maidenhair Spleenwort | Polypodiopsida | Aspleniaceae | TBD |
| Asplenium viride | Green Spleenwort | Polypodiopsida | Aspleniaceae | TBD |
| Athyrium distentifolium | Alpine Lady Fern, Alpine Lady-Fern | Polypodiopsida | Athyriaceae | C |
| Athyrium filix-femina cyclosporum | Lady Fern | Polypodiopsida | Athyriaceae | C |
| Cystopteris fragilis | Fragile Fern | Polypodiopsida | Cystopteridaceae | C |
| Gymnocarpium disjunctum | Western Oak Fern, Pacific Oak Fern | Polypodiopsida | Cystopteridaceae | C |
| Gymnocarpium dryopteris | Oak Fern | Polypodiopsida | Cystopteridaceae | C |
| Pteridium aquilinum | Bracken Fern | Polypodiopsida | Dennstaedtiaceae | C |
| Dryopteris carthusiana | Toothed Wood Fern | Polypodiopsida | Dryopteridaceae | C |
| Dryopteris cristata | Crested Wood Fern | Polypodiopsida | Dryopteridaceae | C |
| Dryopteris expansa | Spiny Wood Fern, Spreading Wood Fern | Polypodiopsida | Dryopteridaceae | C |
| Dryopteris filix-mas | Male Fern | Polypodiopsida | Dryopteridaceae | C |
| Polystichum braunii | Braun's Holly Fern, Braun's Hollyfern | Polypodiopsida | Dryopteridaceae | P |
| Polystichum kruckebergii | Kruckeberg's Hollyfern | Polypodiopsida | Dryopteridaceae | TBD |
| Polystichum lonchitis | Northern Holly Fern | Polypodiopsida | Dryopteridaceae | C |
| Polystichum munitum | Western Sword Fern | Polypodiopsida | Dryopteridaceae | C |
| Matteuccia struthiopteris | Ostrich Fern | Polypodiopsida | Onocleaceae | TBD |
| Polypodium hesperium | Western Polypody | Polypodiopsida | Polypodiaceae | C |
| Adiantum aleuticum | Northern Maiden-Hair, Western Maidenhair Fern | Polypodiopsida | Pteridaceae | TBD |
| Aspidotis densa | Dense Lace Fern | Polypodiopsida | Pteridaceae | TBD |
| Cryptogramma acrostichoides | Parsley Fern, American Parsley Fern | Polypodiopsida | Pteridaceae | C |
| Cryptogramma stelleri | Slender Rock-Brake, Steller's Rock-Brake | Polypodiopsida | Pteridaceae | P |
| Pellaea glabella simplex | Simple Cliff-Brake, Simple Cliffbrake | Polypodiopsida | Pteridaceae | P |
| Woodsia oregana oregana | Western Cliff Fern, Oregon Woodsia | Polypodiopsida | Woodsiaceae | C |
| Woodsia scopulina | Mountain Cliff Fern | Polypodiopsida | Woodsiaceae | C |
| Marsilea vestita | Hairy Water-Clover | Polypodiopsida | Marsileaceae | C |
| Azolla filiculoides | Large Mosquito Fern, Water Fern | Polypodiopsida | Salviniaceae | C |
| Azolla microphylla | Mexican Mosquito Fern | Polypodiopsida | Salviniaceae | C |
| Isoetes howellii | Howell's Quillwort | Lycopodiopsida | Isoetaceae | P |
| Isoetes maritima | Coastal Quillwort, Maritime Quillwort | Lycopodiopsida | Isoetaceae | TBD |
| Isoetes nuttallii | Nuttall's Quillwort | Lycopodiopsida | Isoetaceae | C |
| Isoetes occidentalis | Western Quillwort | Lycopodiopsida | Isoetaceae | P |
| Isoetes tenella | Spiny-spore Quillwort | Lycopodiopsida | Isoetaceae | TBD |
| Isoetes x marensis | Mara Lake Quillwort | Lycopodiopsida | Isoetaceae | P |
| Dendrolycopodium dendroideum | Ground-Pine, Prickly Tree-Clubmoss | Lycopodiopsida | Lycopodiaceae | C |
| Diphasiastrum alpinum | Alpine Club-Moss, Alpine Clubmoss | Lycopodiopsida | Lycopodiaceae | TBD |
| Diphasiastrum complanatum | Ground-Cedar | Lycopodiopsida | Lycopodiaceae | C |
| Huperzia sp. | Temperate firmoss | Lycopodiopsida | Lycopodiaceae | TBD |
| Lycopodiella inundata | Bog Clubmoss | Lycopodiopsida | Lycopodiaceae | C |
| Lycopodium clavatum | Running Clubmoss, Stag's-Horn Clubmoss | Lycopodiopsida | Lycopodiaceae | C |
| Lycopodium lagopus | Ptarmigan Club-Moss, One-cone Clubmoss | Lycopodiopsida | Lycopodiaceae | C |
| Spinulum annotinum | Stiff Clubmoss, Interrupted Clubmoss | Lycopodiopsida | Lycopodiaceae | C |
| Selaginella densa | Compact Selaginella, Dense Spikemoss | Lycopodiopsida | Selaginellaceae | C |
| Selaginella wallacei | Wallace's Selaginella | Lycopodiopsida | Selaginellaceae | C |