Sainfoin / Onobrychis viciifolia

Sainfoin has been grown in parts of Europe and Asia for hundreds of years. Various strains have been introduced to North America as a forage crop since about 1900. We came across this plant on 27th August, growing on Rob Blades' prairie grassland hilltop, west of Nanton, Alberta. I've only ever seen one field of Sainfoin (from a distance), but this is considered a weed. We have seen it growing at Carburn Park in the city. Love the deep purplish pink stripes on the petals. Belongs to the Pea family and blooms June-August.

en.wikipedia.org/wiki/Sainfoin