1984-2004
  • CAROLINIAN CANADA

Natural Heritage Information Centre

Global Rank (GRANK)

GRANK Definition
G1 Extremely rare; usually 5 or fewer occurrences in the overall range or very few remaining individuals; or because of some factor(s) making it especially vulnerable to extinction.
G2 Very rare; usually between 5 and 20 occurrences in the overall range or with many individuals in fewer occurrences; or because of some factor(s) making it vulnerable to extinction.
G3 Rare to uncommon; usually between 20 and 100 occurrences; may have fewer occurrences, but with a large number of individuals in some populations; may be susceptible to large-scale disturbances.
G4 Common; usually more than 100 occurrences; usually not susceptible to immediate threats.
G5 Very common; demonstrably secure under present conditions.
GH Historic, no records in the past 20 years.
GU Status uncertain, often because of low search effort or cryptic nature of the species; more data needed.
GX Globally extinct. No recent records despite specific searches.
? Denotes inexact numeric rank (i.e. G4?).
G A "G" (or "T") followed by a blank space means that the NHIC has not yet obtained the Global Rank from The Nature Conservancy.
G? Unranked, or, if following a ranking, rank tentatively assigned (e.g. G3?).
Q Denotes that the taxonomic status of the species, subspecies, or variety is questionable.
T Denotes that the rank applies to a subspecies or variety.

Natural Heritage Information Centre

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