Arnica lessingii explained

Arnica lessingii is a Russian and North American species of arnica in the sunflower family. The common name is nodding arnica.^[1] It is found on both sides of the Bering Strait, being native to Alaska, Yukon, British Columbia, Northwest Territories, and the Kamchatka Peninsula of the Pacific Coast of Russia.^[2]

Notes and References

1. http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250066118 Flora of North America Vol. 21 Page 369 Nodding arnica, Arnica lessingii (Torrey & A. Gray) Greene
2. http://bonap.net/MapGallery/State/Arnica%20lessingii.png Biota of North America Program 2014 state-level distribution map