Ranking Process

Global = G (refers to range-wide status)
State = S (refers to status within Montana)

G1/S1 Critically imperiled because of extreme rarity or because of some factor (s) of its biology making it especially vulnerable to extinction.
G2/S2 Imperiled because of rarity or because of other factors demonstrably making it very vulnerable to extinction throughout its range.
G3/S3 Either very rare and local throughout its range, or found locally (even abundantly at some of its locations) in a restricted range, or vulnerable to extinction throughout its range because of other factors.
G4/S4 Apparently secure, though it may be quite rare in parts of its range, especially at the periphery.
G5/S5 Demonstrably secure, though it may be quite rare in parts of its range, especially at the periphery.
GU/SU Possibly in peril, but status uncertain; more information needed.
GH/SH Historically known; may be rediscovered.
GX/SX Believed to be extinct; historical records only.
G#/S# Indicates a range of uncertainty about the rarity of the species.

 

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