Rare Species by County: Hampden
Last Updated on 3/1/2003
| Taxonomic Group | Scientific Name | Common Name | State Rank | Federal Rank | Most Recent Obs |
| Fish | Acipenser brevirostrum | Shortnose Sturgeon | E | LE | 1992 |
| Fish | Lota lota | Burbot | SC | 1987 | |
| Fish | Notropis bifrenatus | Bridle Shiner | SC | 1999 | |
| Amphibian | Ambystoma jeffersonianum | Jefferson Salamander | SC | 1999 | |
| Amphibian | Ambystoma laterale | Blue-Spotted Salamander | SC | 2000 | |
| Amphibian | Ambystoma opacum | Marbled Salamander | T | 2002 | |
| Amphibian | Gyrinophilus porphyriticus | Spring Salamander | SC | 1999 | |
| Amphibian | Hemidactylium scutatum | Four-Toed Salamander | SC | 1998 | |
| Amphibian | Scaphiopus holbrookii | Eastern Spadefoot | T | 1996 | |
| Reptile | Carphophis amoenus | Eastern Worm Snake | T | 1998 | |
| Reptile | Clemmys guttata | Spotted Turtle | SC | 2001 | |
| Reptile | Clemmys insculpta | Wood Turtle | SC | 2001 | |
| Reptile | Terrapene carolina | Eastern Box Turtle | SC | 2001 | |
| Bird | Accipiter striatus | Sharp-Shinned Hawk | SC | (PS) | 1884 |
| Bird | Ammodramus savannarum | Grasshopper Sparrow | T | (PS) | 1993 |
| Bird | Asio flammeus | Short-Eared Owl | E | 1935 | |
| Bird | Bartramia longicauda | Upland Sandpiper | E | 1993 | |
| Bird | Botaurus lentiginosus | American Bittern | E | 1999 | |
| Bird | Circus cyaneus | Northern Harrier | T | 1923 | |
| Bird | Cistothorus platensis | Sedge Wren | E | 1982 | |
| Bird | Falco peregrinus | Peregrine Falcon | E | (PS:LE) | 1996 |
| Bird | Gallinula chloropus | Common Moorhen | SC | (PS) | 1984 |
| Bird | Gavia immer | Common Loon | SC | 1864 | |
| Bird | Haliaeetus leucocephalus | Bald Eagle | E | (PS:LT,PDL) | 1999 |
| Bird | Ixobrychus exilis | Least Bittern | E | 1937 | |
| Bird | Podilymbus podiceps | Pied-Billed Grebe | E | 1953 | |
| Bird | Tyto alba | Barn Owl | SC | 1937 | |
| Bird | Vermivora chrysoptera | Golden-Winged Warbler | E | 1992 | |
| Mammal | Myotis leibii | Eastern Small-Footed Bat | SC | 1999 | |
| Mammal | Myotis sodalis | Indiana Myotis | E | LE | 1976 |
| Mammal | Sorex palustris | Water Shrew | SC | 1989 | |
| Mussel | Alasmidonta heterodon | Dwarf Wedgemussel | E | LE | 1975 |
| Mussel | Alasmidonta undulata | Triangle Floater | SC | 2002 | |
| Mussel | Alasmidonta varicosa | Brook Floater (Swollen Wedgemussel) | E | 1996 | |
| Mussel | Lampsilis cariosa | Yellow Lampmussel | E | 1997 | |
| Mussel | Leptodea ochracea | Tidewater Mucket | SC | 1999 | |
| Mussel | Ligumia nasuta | Eastern Pondmussel | SC | ||
| Mussel | Strophitus undulatus | Creeper | SC | 2002 | |
| Crustacean | Eubranchipus intricatus | Intricate Fairy Shrimp | SC | 2002 | |
| Crustacean | Eulimnadia agassizii | Agassiz's Clam Shrimp | E | 1993 | |
| Crustacean | Limnadia lenticularis | American Clam Shrimp | SC | 1993 | |
| Dragonfly/Damselfly | Aeshna mutata | Spatterdock Darner | E | 1996 | |
| Dragonfly/Damselfly | Anax longipes | Comet Darner | SC | 1996 | |
| Dragonfly/Damselfly | Boyeria grafiana | Ocellated Darner | SC | 1999 | |
| Dragonfly/Damselfly | Enallagma carunculatum | Tule Bluet | SC | 1999 | |
| Dragonfly/Damselfly | Gomphus borealis | Beaverpond Clubtail | SC | 1999 | |
| Dragonfly/Damselfly | Gomphus descriptus | Harpoon Clubtail | E | 1999 | |
| Dragonfly/Damselfly | Gomphus quadricolor | A Clubtail Dragonfly | T | 1999 | |
| Dragonfly/Damselfly | Ophiogomphus aspersus | Brook Snaketail | SC | 1902 | |
| Dragonfly/Damselfly | Ophiogomphus carolus | Riffle Snaketail | T | 1999 | |
| Dragonfly/Damselfly | Stylurus amnicola | Riverine Clubtail | E | 1998 | |
| Beetle | Cicindela duodecimguttata | Twelve-Spotted Tiger Beetle | SC | 1999 | |
| Beetle | Cicindela purpurea | Purple Tiger Beetle | SC | 1939 | |
| Beetle | Desmocerus palliatus | Elderberry Long-Horned Beetle | SC | 1994 | |
| Butterfly/Moth | Apodrepanulatrix liberaria | New Jersey Tea Inchworm | E | 1999 | |
| Butterfly/Moth | Callophrys hesseli | Hessel's Hairstreak | SC | 1960 | |
| Butterfly/Moth | Grammia oithona | Oithona Tiger Moth | E | 2002 | |
| Butterfly/Moth | Grammia phyllira | Phyllira Tiger Moth | E | 2002 | |
| Butterfly/Moth | Itame sp 1 nr inextricata | Pine Barrens Itame | SC | 1999 | |
| Butterfly/Moth | Papaipema sp 2 near pterisii | Ostrich Fern Borer Moth | SC | 1999 | |
| Butterfly/Moth | Rhodoecia aurantiago | A Noctuid Moth | T | 1999 | |
| Butterfly/Moth | Zanclognatha martha | Pine Barrens Zanclognatha | T | 1999 | |
| Vascular Plant | Acer nigrum | Black Maple | SC | 1998 | |
| Vascular Plant | Adlumia fungosa | Climbing Fumitory | T | 2001 | |
| Vascular Plant | Agrimonia pubescens | Hairy Agrimony | T | 1998 | |
| Vascular Plant | Amelanchier sanguinea | Roundleaf Shadbush | SC | 1998 | |
| Vascular Plant | Arabis laevigata | Smooth Rock-Cress | T | 1999 | |
| Vascular Plant | Arabis lyrata | Lyre-Leaved Rock-Cress | E | 1880 | |
| Vascular Plant | Arabis missouriensis | Green Rock-Cress | T | 2000 | |
| Vascular Plant | Arceuthobium pusillum | Dwarf Mistletoe | SC | 1986 | |
| Vascular Plant | Arisaema dracontium | Green Dragon | T | 1993 | |
| Vascular Plant | Aristida purpurascens | Purple Needlegrass | T | 1858 | |
| Vascular Plant | Artemisia campestris ssp borealis | Boreal Wormwood | E | (PS) | 1934 |
| Vascular Plant | Asclepias verticillata | Linear-Leaved Milkweed | T | 1999 | |
| Vascular Plant | Asplenium ruta-muraria | Wall-Rue Spleenwort | T | 1990 | |
| Vascular Plant | Calystegia spithamaea | Low Bindweed | E | 1934 | |
| Vascular Plant | Carex glaucodea | Glaucescent Sedge | E | 1997 | |
| Vascular Plant | Carex grayi | Gray's Sedge | T | 1996 | |
| Vascular Plant | Carex lenticularis | Shore Sedge | T | 1935 | |
| Vascular Plant | Carex lupuliformis | E | 1998 | ||
| Vascular Plant | Carex mesochorea | Midland Sedge | E | 1984 | |
| Vascular Plant | Carex polymorpha | Variable Sedge | E | 1840 | |
| Vascular Plant | Cerastium nutans | Nodding Chickweed | E | 1998 | |
| Vascular Plant | Cimicifuga racemosa | Black Cohosh | E | 1980 | |
| Vascular Plant | Claytonia virginica | Narrow-Leaved Spring Beauty | E | 2000 | |
| Vascular Plant | Clematis occidentalis | Purple Clematis | SC | 2000 | |
| Vascular Plant | Cyperus houghtonii | Houghton's Flatsedge | E | 1989 | |
| Vascular Plant | Deschampsia cespitosa ssp glauca | Tufted Hairgrass | E | 1987 | |
| Vascular Plant | Dichanthelium scabriusculum | T | 1990 | ||
| Vascular Plant | Doellingeria infirma | Cornel-Leaved Aster | E | 1998 | |
| Vascular Plant | Elymus villosus | Hairy Wild Rye | E | 1913 | |
| Vascular Plant | Equisetum scirpoides | Dwarf Scouring-Rush | SC | 1913 | |
| Vascular Plant | Eragrostis frankii | Frank's Lovegrass | SC | 1993 | |
| Vascular Plant | Eriophorum gracile | Slender Cottongrass | T | 1989 | |
| Vascular Plant | Galium boreale | Northern Bedstraw | E | 1929 | |
| Vascular Plant | Gentiana andrewsii | Andrews' Bottle Gentian | E | 1997 | |
| Vascular Plant | Houstonia longifolia var longifolia | Long-Leaved Bluet | E | 1914 | |
| Vascular Plant | Hypericum ascyron | Giant St. John's-Wort | E | 1858 | |
| Vascular Plant | Isoetes lacustris | Lake Quillwort | E | 1930 | |
| Vascular Plant | Liatris borealis | New England Blazing Star | SC | 2000 | |
| Vascular Plant | Lipocarpha micrantha | T | 1998 | ||
| Vascular Plant | Ludwigia polycarpa | Many-Fruited False-Loosestrife | E | 1999 | |
| Vascular Plant | Lygodium palmatum | Climbing Fern | SC | 2000 | |
| Vascular Plant | Mimulus alatus | Winged Monkey-Flower | E | 1999 | |
| Vascular Plant | Moehringia macrophylla | Large-Leaved Sandwort | E | 1994 | |
| Vascular Plant | Morus rubra | Red Mulberry | E | 1998 | |
| Vascular Plant | Nuphar microphylla | Tiny Cow-Lily | E | 1987 | |
| Vascular Plant | Ophioglossum pusillum | Adder's-Tongue Fern | T | 1934 | |
| Vascular Plant | Oxalis violacea | Violet Wood-Sorrel | E | 1990 | |
| Vascular Plant | Panicum philadelphicum | Philadelphia Panic-Grass | SC | 1997 | |
| Vascular Plant | Pedicularis lanceolata | Swamp Lousewort | E | 1997 | |
| Vascular Plant | Platanthera flava var herbiola | Pale Green Orchis | T | 1915 | |
| Vascular Plant | Poa languida | Drooping Speargrass | E | 1928 | |
| Vascular Plant | Polygonum setaceum var interjectum | Strigose Knotweed | T | 1914 | |
| Vascular Plant | Prenanthes serpentaria | Lion's Foot | E | 2000 | |
| Vascular Plant | Ranunculus micranthus | Tiny-Flowered Buttercup | E | 1913 | |
| Vascular Plant | Ranunculus pensylvanicus | Bristly Buttercup | T | 1997 | |
| Vascular Plant | Rhododendron maximum | Great Laurel | T | 1946 | |
| Vascular Plant | Rhynchospora scirpoides | Long-Beaked Bald-Sedge | SC | 1995 | |
| Vascular Plant | Rotala ramosior | Toothcup | E | 2001 | |
| Vascular Plant | Rumex verticillatus | Swamp Dock | T | 2000 | |
| Vascular Plant | Sagittaria cuneata | Wapato | T | 1998 | |
| Vascular Plant | Sagittaria teres | Terete Arrowhead | SC | 1997 | |
| Vascular Plant | Salix exigua | Sandbar Willow | T | 1985 | |
| Vascular Plant | Scheuchzeria palustris | Pod-Grass | E | 1892 | |
| Vascular Plant | Scleria triglomerata | Tall Nut-Sedge | E | 1934 | |
| Vascular Plant | Senna hebecarpa | Wild Senna | E | 1913 | |
| Vascular Plant | Sisyrinchium mucronatum | Slender Blue-Eyed Grass | E | 1919 | |
| Vascular Plant | Solidago ptarmicoides | Upland White Aster | E | 1997 | |
| Vascular Plant | Sphenopholis nitida | Shining Wedgegrass | T | 1999 | |
| Vascular Plant | Sphenopholis pensylvanica | Swamp Oats | T | 1911 | |
| Vascular Plant | Symphyotrichum tradescantii | Tradescant's Aster | T | 1997 | |
| Vascular Plant | Trichostema brachiatum | False Pennyroyal | E | 2000 | |
| Vascular Plant | Trisetum triflorum ssp molle | Spiked False Oats | E | 1984 | |
| Vascular Plant | Verbena simplex | Narrow-Leaved Vervain | E | 2000 | |
| Vascular Plant | Veronicastrum virginicum | Culver's-Root | T | 1998 | |
| Vascular Plant | Viola nephrophylla | Northern Bog Violet | E | 1990 |