Localities documented in Tropicos sources
United States (North America)
Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
- Anonymous. 1986. List-Based Rec., Soil Conserv. Serv., U.S.D.A. Database of the U.S.D.A., Beltsville. http://www.tropicos.org/Reference/1103
Regularity: Regularly occurring
Type of Residency: Year-round
Global Range: Presently known from only two locations in the Rat Island group of the western Aleutian Islands, and probably restricted to this area.
Comments: Open fellfields on windswept, gravelly ridges with sparse vegetaton. The species occurs as scattered, white, often sterile rosettes on seemingly barren patches between heath vegetation.
Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: 1 - 5
Comments: It is likely that several new EO's will be added when the Rat Islands are more fully explored.
National NatureServe Conservation Status
Rounded National Status Rank: N1 - Critically Imperiled
NatureServe Conservation Status
Rounded Global Status Rank: G1 - Critically Imperiled
Reasons: Known only from 2 adjacent islands in the western Aleutian Islands. Only 2 populations are confirmed extant. Population numbers appear to be relatively low (fewer than 3,000 individual plants in total), and the populations are in areas of high natural disturbance.
Environmental Specificity: Narrow. Specialist or community with key requirements common.
Comments: Restricted to windswept fellfields.
Global Short Term Trend: Unknown
Comments: Not known, but no dramatic changes reported in recent years.
Global Long Term Trend: Unknown
Comments: Not known, but likely to be relatively stable.
Comments: Threat is from small population in highly restricted area, with high degree of natural disturbance (wind swept fellfield).
Names and Taxonomy
Comments: Distinct species with affinites to A. richardsoniana Besser (B87MUR01AKUS).
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