Arnica rydbergii, July 17, 2020
Common & scientific name
Subalpine arnica, Arnica rydbergii
Family
Sunflower, Asteraceae
Location
Summit area, 12,000’
Fun, weird, helpful, or little known fact
This Arnica can be distinguished from the other half-dozen hard-to-tell-apart Arnicas by its location (likes treeline, dry slopes), single flower on top (unlike A. mollis which usually has three—a rare instance where Bill Weber got it wrong), less fuzzy than A. mollis or A. latifiolia, overall smaller, and as it ages the tips of its petals whiten (see photo below).
A. rydbbergii, July 23, 2020