Physostegia virginiana: flowers

Physostegia virginiana, known in English as obedient plant and in French as physostegia or physostégie, is a perennial native to much of eastern and central North America. It has spires of pink blossoms with a unique property: each flower is attached by a kind of hinge, and if you push it into a new position it will stay there (hence the English common name).

I photographed this lovely clump at Earl Beatty Public School.