Dalea purpurea

Dalea purpurea

Dalea purpurea Vent.
Engl.: purple prairie clover, thimbleweed.
Sven.: prärieklöver.
Bot. syn.: Petalostemon purpureus (Vent.) Rydb.

I have no articles for this botanical term, but there might be some for the next level down (if found).