MONTANA FIELD GUIDE™

DRAFT: Requesting feedback on the 2026 revised rank, factors, and State Rank Reason outlined below and in the Conservation Status Rank Report. Eriophorum angustifolium is an uncommon species of fens across western and central Montana. Occurrences are almost entirely on publicly managed lands, including many on National Forest lands managed for multiple use. Less than two dozen occurrences are protected within Glacier National Park or within designated wilderness or other conservation areas. Population levels are uncertain though they may be relatively robust. Statewide populations appear likely to be smaller than those of either Eriophorum chamissonis or Eriophorum viridicarinatum based on the available though limited data. Trends are unknown though populations have likely been relatively stable in the recent past or experienced only minor declines. Climate change may negatively affect this species over the next several decades. However, the timing and magnitude of potential impacts are largely unknown. Although climate change is listed as a potential threat to the species, it does not affect the overall threat rank or scoring, or the final subnational rank. Survey and monitoring data are needed to be able to more precisely determine population levels, assess condition and for assessing population trends.