Regularity: Regularly occurring
Global Range: This species is known from high mountain slopes of the Aleutian, Pribilof, and Semidi Islands. It is also reported (but not confirmed) from Kodiak Island.
Comments: High alpine fell-field and screes.
Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: 6 - 80
Comments: Known from at least sixteen sites in remote alpine areas. Additional sites should be expected as these areas are explored.
Life History and Behavior
National NatureServe Conservation Status
Rounded National Status Rank: N3 - Vulnerable
NatureServe Conservation Status
Rounded Global Status Rank: G3 - Vulnerable
Reasons: Known from sixteen sites in remote alpine areas. This small, easily overlooked species is likely to be found at additional sites as these areas are further explored.
Comments: The high alpine habitats in the Aleutian and Pribilof Islands face no threats at present.
Names and Taxonomy
Comments: A distinct taxon, endemic to the Aleutian, Pribilof and Kodiak Islands. Recognized as a distinct species by most authors (including Kartesz, 1994 checklist), but treated as a variety of C. BEERINGIANUM by Welsh (1974).