Piperia unalascensis (Spreng.) Rydb., syn. Platanthera unalascensis (Spreng.) Kurtz, is native to much of North America, mostly in the West in Alaska south to the Southern States, and in Eastern Canada in the Great Lakes region. The green flowers are widely spaced on the inflorescence, with a sweet to musky scent in the evenings. The first two photos taken by Jason Hollinger are from the Wikimedia Commons website and are added here under the Creative Commons License. The next two photos from Aaron Arthur. The last photo taken by JW Stockert is from the National Parks Service Archive and thus in the public domain.