Rare Species by County: Nantucket
Last Updated on 3/1/2003
| Taxonomic Group | Scientific Name | Common Name | State Rank | Federal Rank | Most Recent Obs |
| Amphibian | Scaphiopus holbrookii | Eastern Spadefoot | T | 1997 | |
| Reptile | Clemmys guttata | Spotted Turtle | SC | 2001 | |
| Reptile | Terrapene carolina | Eastern Box Turtle | SC | 1992 | |
| Bird | Ammodramus savannarum | Grasshopper Sparrow | T | (PS) | 1997 |
| Bird | Asio flammeus | Short-Eared Owl | E | 1998 | |
| Bird | Asio otus | Long-Eared Owl | SC | 1985 | |
| Bird | Bartramia longicauda | Upland Sandpiper | E | 1955 | |
| Bird | Botaurus lentiginosus | American Bittern | E | 197- | |
| Bird | Charadrius melodus | Piping Plover | T | (LE,LT) | 1997 |
| Bird | Circus cyaneus | Northern Harrier | T | 2000 | |
| Bird | Gallinula chloropus | Common Moorhen | SC | (PS) | 1955 |
| Bird | Podilymbus podiceps | Pied-Billed Grebe | E | 1988 | |
| Bird | Sterna antillarum | Least Tern | SC | (PS:LE) | 1998 |
| Bird | Sterna dougallii | Roseate Tern | E | (PS:LE,LT) | 1931 |
| Bird | Sterna hirundo | Common Tern | SC | 1996 | |
| Bird | Sterna paradisaea | Arctic Tern | SC | 1995 | |
| Bird | Tyto alba | Barn Owl | SC | 1990 | |
| Beetle | Cicindela duodecimguttata | Twelve-Spotted Tiger Beetle | SC | 1923 | |
| Beetle | Cicindela purpurea | Purple Tiger Beetle | SC | 1991 | |
| Beetle | Desmocerus palliatus | Elderberry Long-Horned Beetle | SC | 1930 | |
| Butterfly/Moth | Abagrotis nefascia benjamini | Coastal Heathland Cutworm | SC | 2000 | |
| Butterfly/Moth | Acronicta albarufa | Barrens Daggermoth | T | 1999 | |
| Butterfly/Moth | Anisota stigma | Spiny Oakworm | SC | 2000 | |
| Butterfly/Moth | Bagisara rectifascia | Straight Lined Mallow Moth | SC | 2000 | |
| Butterfly/Moth | Catocala herodias gerhardi | Gerhard's Underwing Moth | SC | 2000 | |
| Butterfly/Moth | Cicinnus melsheimeri | Melsheimer's Sack Bearer | T | 2000 | |
| Butterfly/Moth | Cingilia catenaria | Chain Dot Geometer | SC | 1997 | |
| Butterfly/Moth | Hemileuca maia | Barrens Buckmoth | SC | 1996 | |
| Butterfly/Moth | Metarranthis pilosaria | Coastal Swamp Metarranthis Moth | SC | 2000 | |
| Butterfly/Moth | Oncocnemis riparia | Dune Noctuid Moth | SC | 1996 | |
| Butterfly/Moth | Papaipema appassionata | Pitcher Plant Borer Moth | T | 1941 | |
| Butterfly/Moth | Papaipema stenocelis | Chain Fern Borer Moth | T | 1940 | |
| Butterfly/Moth | Papaipema sulphurata | Water-Willow Stem Borer | T | 1994 | |
| Butterfly/Moth | Zale sp 1 nr lunifera | Pine Barrens Zale | SC | 2000 | |
| Vascular Plant | Agrimonia pubescens | Hairy Agrimony | T | 1989 | |
| Vascular Plant | Amelanchier nantucketensis | Nantucket Shadbush | SC | 1999 | |
| Vascular Plant | Amphicarpum purshii | Annual Peanut-Grass | E | 1999 | |
| Vascular Plant | Aristida purpurascens | Purple Needlegrass | T | 1986 | |
| Vascular Plant | Asclepias purpurascens | Purple Milkweed | E | 1986 | |
| Vascular Plant | Carex striata var brevis | Walter's Sedge | E | 1908 | |
| Vascular Plant | Corema conradii | Broom Crowberry | SC | 1996 | |
| Vascular Plant | Crassula aquatica | Pygmyweed | T | 1994 | |
| Vascular Plant | Crataegus bicknellii | Bicknell's Hawthorn | E | 1996 | |
| Vascular Plant | Dichanthelium commonsianum | Commons's Panic-Grass | SC | 1984 | |
| Vascular Plant | Dichanthelium mattamuskeetense | Mattamuskeet Panic-Grass | E | 1990 | |
| Vascular Plant | Eleocharis tricostata | Three-Angled Spike-Sedge | E | 1996 | |
| Vascular Plant | Eupatorium aromaticum | Lesser Snakeroot | E | 2000 | |
| Vascular Plant | Gamochaeta purpurea | Purple Cudweed | E | 1990 | |
| Vascular Plant | Helianthemum dumosum | Bushy Rockrose | SC | 1999 | |
| Vascular Plant | Hydrocotyle verticillata | Saltpond Pennywort | T | 1995 | |
| Vascular Plant | Hypericum adpressum | Creeping St. John's-Wort | T | 1996 | |
| Vascular Plant | Hypericum hypericoides ssp multicaule | St. Andrew's Cross | E | 2000 | |
| Vascular Plant | Lechea pulchella var moniliformis | Bead Pinweed | E | 1989 | |
| Vascular Plant | Leptochloa fascicularis var maritima | Saltpond Grass | T | 1999 | |
| Vascular Plant | Liatris borealis | New England Blazing Star | SC | 2000 | |
| Vascular Plant | Linum intercursum | Sandplain Flax | SC | 1989 | |
| Vascular Plant | Lycopodiella alopecuroides | Foxtail Clubmoss | E | 1999 | |
| Vascular Plant | Lycopus rubellus | Gypsywort | E | 1989 | |
| Vascular Plant | Mertensia maritima | Oysterleaf | E | 1994 | |
| Vascular Plant | Ophioglossum pusillum | Adder's-Tongue Fern | T | 1911 | |
| Vascular Plant | Opuntia humifusa | Prickly Pear | E | 1997 | |
| Vascular Plant | Polygonum glaucum | Sea-Beach Knotweed | SC | 1983 | |
| Vascular Plant | Polygonum setaceum var interjectum | Strigose Knotweed | T | 1908 | |
| Vascular Plant | Prenanthes serpentaria | Lion's Foot | E | 2002 | |
| Vascular Plant | Rhynchospora torreyana | Torrey's Beak-Sedge | E | 1989 | |
| Vascular Plant | Rumex pallidus | Seabeach Dock | T | 1884 | |
| Vascular Plant | Rumex verticillatus | Swamp Dock | T | 1884 | |
| Vascular Plant | Sabatia campanulata | Slender Marsh Pink | E | 2002 | |
| Vascular Plant | Sabatia kennedyana | Plymouth Gentian | SC | 1889 | |
| Vascular Plant | Sanicula canadensis | Canadian Sanicle | T | 1989 | |
| Vascular Plant | Scleria pauciflora var caroliniana | Papillose Nut-Sedge | E | 1998 | |
| Vascular Plant | Scleria triglomerata | Tall Nut-Sedge | E | 1907 | |
| Vascular Plant | Setaria geniculata | Bristly Foxtail | SC | 1983 | |
| Vascular Plant | Sisyrinchium arenicola | Sandplain Blue-Eyed Grass | SC | 1995 | |
| Vascular Plant | Spartina cynosuroides | Salt Reedgrass | T | 1911 | |
| Vascular Plant | Sphenopholis pensylvanica | Swamp Oats | T | 1908 | |
| Vascular Plant | Suaeda calceoliformis | American Sea-Blite | SC | 1989 | |
| Vascular Plant | Symphyotrichum concolor | Eastern Silvery Aster | E | 2000 | |
| Vascular Plant | Triosteum perfoliatum | Broad Tinker's-Weed | E | 1907 | |
| Vascular Plant | Utricularia subulata | Subulate Bladderwort | SC | 1989 |