GLOBAL 

 RANK 



Definition 



Critically imperiled globally because of extreme rarity (5 or 

 fewer occurrences, or very few remaining individuals), or because 

 of some factor of its biology making it especially vulnerable to 

 extinction. 



Imperiled globally because of rarity (6 to 20 occurrences), or 

 because of other factors demonstrably ma)ting it very vulnerable to 

 extinction throughout its range. 



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; in the range of 21 to 100 occurrences. 



Apparently secure globally, though it may be quite rare in parts 

 of its range, especially at the periphery. 



Demonstrably secure globally, though it may be quite rare in parts 

 of its range, especially at the periphery. 



Possibly in peril range-wide, but status uncertain; more 

 information needed. 



GH Historically known; may be rediscovered. 



GX Believed to be extinct throughout range; historical records only, 

 continue search. 



HYB Subfertile or sterile hybrid. 



STATE 

 RANK 



Definition 



Critically imperiled in Montana because of extreme rarity (5 or 

 fewer occurrences, or very few remaining individuals), or because 

 of some factor of its biology making it especially vulnerable to 

 extirpation from the state. 



Imperiled in Montana because of rarity (6 to 20 occurrences), or 

 because of other factors demonstrably making it very vulnerable to 

 extirpation from the state. 



Rare in Montana (on the order of 21+ occurrences). 



Apparently secure in Montana. 



Demonstrably secure in Montana. 



Possibly in peril in Montana, but status uncertain; more 

 information needed. 



SH Historically known in Montana; may be rediscovered. 

 SX Apparently extirpated from Montana. 



