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26 <br /> GLOBAL AND STATE RANKS <br /> These ranks are determined by The Nature Conservancy's system of measuring rarity and threat status. "Global" refers to <br /> worldwide ranks and "State" to statewide ranks. <br /> STATE RANK DEFINITIONS <br /> S1 Critically imperiled in North Carolina because of extreme rarity or otherwise very vulnerable to extirpation in the state. <br /> S2 Imperiled in North Carolina because of rarity or otherwise vulnerable to extirpation in the state. <br /> S3 Rare or uncommon in North Carolina. <br /> S4 Apparently secure in North Carolina, with many occurrences. <br /> S5 Demonstrably secure in North Carolina and essentially ineradicable under present conditions. <br /> SA Accidental or casual; one to several records for North Carolina, but the state is outside the normal range of the species. <br /> SH Of historical occurrence in North Carolina, perhaps not having been verified in the past 25 years, and suspected to be <br /> still extant in the state. <br /> SR Reported from North Carolina, but without persuasive documentation for either accepting or rejecting the report. <br /> SX Believed to be extirpated from North Carolina. <br /> SU Possibly in peril in North Carolina, but status uncertain; more information is needed. <br /> S? Unranked, or rank uncertain. — - <br /> _B Rank of breeding population in the state. Used for migratory species only. <br /> _N Rank of non-breeding population in the state. Used for migratory species only. <br /> _Z_ Population is not of significant conservation concern; applies to transitory, migratory species. <br /> GLOBAL RANK DEFINITIONS <br /> G1 Critically imperiled globally because of extreme rarity or otherwise very vulnerable to extinction throughout its range. <br /> G2 Imperiled globally because of rarity or otherwise vulnerable to extinction throughout its range. <br /> G3 Either very rare and local throughout its range, or found locally in a restricted area. <br /> G4 Apparently.secure globally, although it may be quite rare in parts of its range (especially at the periphery). <br /> G5 Demonstrably secure globally, although it may be quite rare in parts of its range (especially at the periphery). <br /> GH Of historical occurrence throughout its range. <br /> GX Believed to be extinct throughout its range. <br /> GU Possibly in peril, but status uncertain; more information is needed. <br /> G? Unranked, or rank uncertain. <br /> G_Q Of questionable taxonomic status. <br /> T_ Status of subspecies or variety; the G rank refers to the species as a whole. <br /> ADDITIONAL DEFINFII'IONS <br /> Species names marked with 1, 2, 3, or 4 asterisks indicate historic, obscure, or incidental records. <br /> * Historic record -the species was last observed in the county over 50 years ago. <br /> ** Obscure record- the date and/or location of the species observation is uncertain. <br /> *** Incidental/migrant record-the species was observed outside of its normal range or habitat. <br /> **** Historic, Obscure, and Incidental record. - <br /> Scientific and common nan,,m listed in parentheses are synonyms listed in US Fish and Wildlife Service, 1992, Endangered and <br /> Threatened Species of the;SO abewern United States (The Red Book). <br /> NC NATURAL HERITAGE PROGRAM, DIVISION OF PARKS AND RECREATION, DEHNR JULY 1996 <br />