* Status:
NC:E = Endangered; legal status as designated by the NC Wildlife Resources Commission
T = Threatened; legal status as designated by the NC Wildlife Resources Commission
SC = Special Concern; legal status as designated by the NC Wildlife Resources Commission
SR = Significantly Rare; non-legal status as given by the NC Natural Heritage Program
W = Watch List; non-legal status as given by the NC Natural Heritage Program
US:E = Endangered; legal status as designated by the US Fish & Wildlife Service
T = Threatened; legal status as designated by the US Fish & Wildlife Service
PE = Proposed Endangered; designation by the US Fish & Wildlife Service
FSC = Federal Species of Concern; designation by the US Fish & Wildlife Service

Rank:NatureServe gives each plant and animal species a global rank of rarity, and each state Natural Heritage Program gives each species occurring within its borders a state rank of rarity. Thus, each species has a global and state rank. For each species, the S# varies from state to state, depending on rarity (number of records, threats, etc.).

State:
RankNumber of Extant Populations
S11-5Critically imperiled in North Carolina because of extreme rarity or because of some factor(s) making it especially vulnerable to extirpation from North Carolina.
S26-20Imperiled in North Carolina because of rarity or because of some other factor(s) making it very vulnerable to extirpation from North Carolina.
S321-100Rare or uncommon in North Carolina.
S4101-1000Apparently secure in North Carolina, though it may be quite rare in parts of its range, especially at the periphery.
S51001+Demonstrably secure in North Carolina, though it may be quite rare in parts of its range, especially at the periphery.
S#M1-1001+Migratory, or with extensive movements (used here only for aquatic species – whales, dolphins, porpoises, seals, and manatee).
SU1+Status and abundance uncertain; need more information.
SA1?Accidental or casual; one to several records for North Carolina, but the state is outside the normal range of the species.
SE1-1001+Exotic; not native to North Carolina.
SH0Of historical occurrence, perhaps not having been verified in the past 20 years, and suspected to be still extant.
SX0Presumed extirpated -- believed to be extirpated in North Carolina.

Global: Global ranks are similar to state ranks except "in North Carolina" is replaced by "globally", and "extirpation from North Carolina" is replaced by "extinction". Additional global ranks are:
T# ---The rank of a subspecies or variety. As an example, G4T1 would apply to a subspecies of a species with an overall rank of G4, but the subspecies warranting a rank of G1.
GNR---Not ranked.