Photographed this plant when we visited the amazing homestead gardens belonging to Jim Coutts, just north east of Nanton, southern Alberta, on 27th August. This native wildflower is also called Rocky Mountain Beeweed, Rocky Mountain Beeplant, Stinking Clover and Navajo Spinach. I think this was only the second time I'd seen this plant.

en.wikipedia.org/wiki/Cleome_serrulata