Rare Species by County: Plymouth
Last Updated on 3/1/2003
| Taxonomic Group | Scientific Name | Common Name | State Rank | Federal Rank | Most Recent Obs |
| Fish | Notropis bifrenatus | Bridle Shiner | SC | 1999 | |
| Amphibian | Ambystoma laterale | Blue-Spotted Salamander | SC | 1999 | |
| Amphibian | Ambystoma opacum | Marbled Salamander | T | 1986 | |
| Amphibian | Hemidactylium scutatum | Four-Toed Salamander | SC | 2000 | |
| Amphibian | Scaphiopus holbrookii | Eastern Spadefoot | T | 1979 | |
| Reptile | Clemmys guttata | Spotted Turtle | SC | 2001 | |
| Reptile | Clemmys insculpta | Wood Turtle | SC | 1995 | |
| Reptile | Emydoidea blandingii | Blanding's Turtle | T | 1994 | |
| Reptile | Malaclemys terrapin | Diamondback Terrapin | T | 2000 | |
| Reptile | Pseudemys rubriventris pop 1 | Northern Red-Bellied Cooter | E | LE | 2000 |
| Reptile | Terrapene carolina | Eastern Box Turtle | SC | 2001 | |
| Bird | Accipiter striatus | Sharp-Shinned Hawk | SC | (PS) | 1988 |
| Bird | Ammodramus savannarum | Grasshopper Sparrow | T | (PS) | 1997 |
| Bird | Asio otus | Long-Eared Owl | SC | 1978 | |
| Bird | Bartramia longicauda | Upland Sandpiper | E | 1994 | |
| Bird | Botaurus lentiginosus | American Bittern | E | 1993 | |
| Bird | Charadrius melodus | Piping Plover | T | (LE,LT) | 1996 |
| Bird | Circus cyaneus | Northern Harrier | T | 1898 | |
| Bird | Gallinula chloropus | Common Moorhen | SC | (PS) | 1992 |
| Bird | Gavia immer | Common Loon | SC | 1872 | |
| Bird | Haliaeetus leucocephalus | Bald Eagle | E | (PS:LT,PDL) | 1999 |
| Bird | Ixobrychus exilis | Least Bittern | E | 1990 | |
| Bird | Parula americana | Northern Parula | T | 1995 | |
| Bird | Podilymbus podiceps | Pied-Billed Grebe | E | 1992 | |
| Bird | Rallus elegans | King Rail | T | 1995 | |
| Bird | Sterna antillarum | Least Tern | SC | (PS:LE) | 1998 |
| Bird | Sterna dougallii | Roseate Tern | E | (PS:LE,LT) | 1998 |
| Bird | Sterna hirundo | Common Tern | SC | 1998 | |
| Bird | Sterna paradisaea | Arctic Tern | SC | 1998 | |
| Bird | Tyto alba | Barn Owl | SC | 1985 | |
| Mammal | Synaptomys cooperi | Southern Bog Lemming | SC | 1894 | |
| Mussel | Alasmidonta heterodon | Dwarf Wedgemussel | E | LE | 1866 |
| Mussel | Alasmidonta undulata | Triangle Floater | SC | 1999 | |
| Mussel | Lampsilis cariosa | Yellow Lampmussel | E | 1841 | |
| Mussel | Leptodea ochracea | Tidewater Mucket | SC | 1999 | |
| Mussel | Ligumia nasuta | Eastern Pondmussel | SC | 2001 | |
| Mussel | Strophitus undulatus | Creeper | SC | 1995 | |
| Mussel | Vertigo perryi | Olive Vertigo | SC | 1912 | |
| Crustacean | Crangonyx aberrans | Mystic Valley Amphipod | SC | 1997 | |
| Dragonfly/Damselfly | Anax longipes | Comet Darner | SC | 1999 | |
| Dragonfly/Damselfly | Boyeria grafiana | Ocellated Darner | SC | 1912 | |
| Dragonfly/Damselfly | Enallagma daeckii | Attenuated Bluet | SC | 1994 | |
| Dragonfly/Damselfly | Enallagma laterale | New England Bluet | SC | 1999 | |
| Dragonfly/Damselfly | Enallagma recurvatum | Pine Barrens Bluet | T | 1999 | |
| Dragonfly/Damselfly | Neurocordulia obsoleta | Umber Shadowdragon | SC | 1998 | |
| Dragonfly/Damselfly | Somatochlora kennedyi | Kennedy's Emerald | E | 1989 | |
| Beetle | Cicindela duodecimguttata | Twelve-Spotted Tiger Beetle | SC | 1915 | |
| Beetle | Cicindela purpurea | Purple Tiger Beetle | SC | 1999 | |
| Butterfly/Moth | Abagrotis nefascia benjamini | Coastal Heathland Cutworm | SC | 1991 | |
| Butterfly/Moth | Acronicta albarufa | Barrens Daggermoth | T | 2001 | |
| Butterfly/Moth | Anisota stigma | Spiny Oakworm | SC | 2001 | |
| Butterfly/Moth | Apamea mixta | Coastal Plain Apamea Moth | SC | 1975 | |
| Butterfly/Moth | Callophrys hesseli | Hessel's Hairstreak | SC | 1992 | |
| Butterfly/Moth | Catocala herodias gerhardi | Gerhard's Underwing Moth | SC | 2001 | |
| Butterfly/Moth | Cicinnus melsheimeri | Melsheimer's Sack Bearer | T | 2001 | |
| Butterfly/Moth | Cingilia catenaria | Chain Dot Geometer | SC | 1977 | |
| Butterfly/Moth | Erynnis persius persius | Persius Duskywing | E | 2001 | |
| Butterfly/Moth | Hemaris gracilis | Slender Clearwing Sphinx Moth | SC | 2001 | |
| Butterfly/Moth | Hemileuca maia | Barrens Buckmoth | SC | 2001 | |
| Butterfly/Moth | Hypomecis buchholzaria | Buchholz's Gray | E | 2001 | |
| Butterfly/Moth | Itame sp 1 nr inextricata | Pine Barrens Itame | SC | 1999 | |
| Butterfly/Moth | Lithophane viridipallens | Pale Green Pinion Moth | SC | 1985 | |
| Butterfly/Moth | Metarranthis apiciaria | Barrens Metarranthis Moth | E | 1909 | |
| Butterfly/Moth | Metarranthis pilosaria | Coastal Swamp Metarranthis Moth | SC | 2001 | |
| Butterfly/Moth | Papaipema appassionata | Pitcher Plant Borer Moth | T | 1971 | |
| Butterfly/Moth | Papaipema stenocelis | Chain Fern Borer Moth | T | 2001 | |
| Butterfly/Moth | Papaipema sulphurata | Water-Willow Stem Borer | T | 2001 | |
| Butterfly/Moth | Psectraglaea carnosa | Pink Sallow | SC | 2001 | |
| Butterfly/Moth | Spartiniphaga inops | Spartina Borer Moth | SC | 1977 | |
| Butterfly/Moth | Zale sp 1 nr lunifera | Pine Barrens Zale | SC | 1999 | |
| Butterfly/Moth | Zanclognatha martha | Pine Barrens Zanclognatha | T | 1999 | |
| Vascular Plant | Aristida purpurascens | Purple Needlegrass | T | 1987 | |
| Vascular Plant | Aristida tuberculosa | Seabeach Needlegrass | T | 1987 | |
| Vascular Plant | Asclepias verticillata | Linear-Leaved Milkweed | T | 1914 | |
| Vascular Plant | Bidens hyperborea var colpophila | Estuary Beggar-Ticks | E | 1987 | |
| Vascular Plant | Calamagrostis pickeringii | Reed Bentgrass | E | 2001 | |
| Vascular Plant | Cardamine longii | Long's Bitter-Cress | E | 2000 | |
| Vascular Plant | Carex polymorpha | Variable Sedge | E | 2000 | |
| Vascular Plant | Carex striata var brevis | Walter's Sedge | E | 1995 | |
| Vascular Plant | Conioselinum chinense | Hemlock Parsley | SC | 1988 | |
| Vascular Plant | Corema conradii | Broom Crowberry | SC | 2000 | |
| Vascular Plant | Crassula aquatica | Pygmyweed | T | 1998 | |
| Vascular Plant | Cyperus houghtonii | Houghton's Flatsedge | E | 1890 | |
| Vascular Plant | Dichanthelium mattamuskeetense | Mattamuskeet Panic-Grass | E | 1990 | |
| Vascular Plant | Dichanthelium wrightianum | Wright's Panic-Grass | SC | 1990 | |
| Vascular Plant | Elatine americana | American Waterwort | E | 1980 | |
| Vascular Plant | Eriocaulon parkeri | Estuary Pipewort | E | 1998 | |
| Vascular Plant | Eupatorium aromaticum | Lesser Snakeroot | E | 1935 | |
| Vascular Plant | Eupatorium leucolepis var novae-angliae | New England Boneset | E | 1999 | |
| Vascular Plant | Helianthemum dumosum | Bushy Rockrose | SC | 1983 | |
| Vascular Plant | Isoetes acadiensis | Acadian Quillwort | E | 1989 | |
| Vascular Plant | Lachnanthes caroliana | Redroot | SC | 1993 | |
| Vascular Plant | Liatris borealis | New England Blazing Star | SC | 2001 | |
| Vascular Plant | Linum medium var texanum | Rigid Flax | T | 2000 | |
| Vascular Plant | Lipocarpha micrantha | T | 1999 | ||
| Vascular Plant | Ludwigia sphaerocarpa | Round-Fruited False-Loosestrife | E | 1999 | |
| Vascular Plant | Lycopus rubellus | Gypsywort | E | 2000 | |
| Vascular Plant | Lygodium palmatum | Climbing Fern | SC | 1986 | |
| Vascular Plant | Mertensia maritima | Oysterleaf | E | 1857 | |
| Vascular Plant | Myriophyllum pinnatum | Pinnate Water-Milfoil | SC | 1910 | |
| Vascular Plant | Ophioglossum pusillum | Adder's-Tongue Fern | T | 1983 | |
| Vascular Plant | Panicum philadelphicum | Philadelphia Panic-Grass | SC | 2000 | |
| Vascular Plant | Panicum rigidulum var. Pubescens | Long-Leaved Panic-Grass | T | 1998 | |
| Vascular Plant | Platanthera flava var herbiola | Pale Green Orchis | T | 1997 | |
| Vascular Plant | Polygonum puritanorum | Pondshore Knotweed | SC | 1990 | |
| Vascular Plant | Polygonum setaceum var interjectum | Strigose Knotweed | T | 1983 | |
| Vascular Plant | Prenanthes serpentaria | Lion's Foot | E | 1933 | |
| Vascular Plant | Ranunculus micranthus | Tiny-Flowered Buttercup | E | 18-- | |
| Vascular Plant | Ranunculus pensylvanicus | Bristly Buttercup | T | 1885 | |
| Vascular Plant | Rhynchospora inundata | Inundated Horned-Sedge | T | 1997 | |
| Vascular Plant | Rhynchospora nitens | Short-Beaked Bald-Sedge | T | 1988 | |
| Vascular Plant | Rhynchospora scirpoides | Long-Beaked Bald-Sedge | SC | 2000 | |
| Vascular Plant | Rhynchospora torreyana | Torrey's Beak-Sedge | E | 1989 | |
| Vascular Plant | Rumex pallidus | Seabeach Dock | T | 1999 | |
| Vascular Plant | Sabatia campanulata | Slender Marsh Pink | E | 1884 | |
| Vascular Plant | Sabatia kennedyana | Plymouth Gentian | SC | 2001 | |
| Vascular Plant | Sagittaria subulata var subulata | River Arrowhead | E | 1990 | |
| Vascular Plant | Sagittaria teres | Terete Arrowhead | SC | 2000 | |
| Vascular Plant | Sanicula canadensis | Canadian Sanicle | T | 2000 | |
| Vascular Plant | Scirpus longii | Long's Bulrush | T | 1994 | |
| Vascular Plant | Senna hebecarpa | Wild Senna | E | ||
| Vascular Plant | Setaria geniculata | Bristly Foxtail | SC | 2000 | |
| Vascular Plant | Spartina cynosuroides | Salt Reedgrass | T | 1989 | |
| Vascular Plant | Sphenopholis pensylvanica | Swamp Oats | T | 2000 | |
| Vascular Plant | Suaeda calceoliformis | American Sea-Blite | SC | 1987 | |
| Vascular Plant | Symphyotrichum concolor | Eastern Silvery Aster | E | 1926 | |
| Vascular Plant | Triosteum perfoliatum | Broad Tinker's-Weed | E | 1890 | |
| Vascular Plant | Utricularia subulata | Subulate Bladderwort | SC | 1990 | |
| Vascular Plant | Viola brittoniana | Britton's Violet | T | 1909 |