Thermopsis rhombifolia could be found in the Great Plains, where do Great Plains could be found in the United States?
Thermopsis rhombifolia: Thermopsis rhombifolia, also known as prairie thermopsis, is a flowering plant in the legume family. Thermopsis rhombifolia:  It is native to Canada and the United States, where it is found in the Great Plains, with extensions into the lower canyons of the Rocky Mountains. Great Plains: The Great Plains (sometimes simply "the Plains") is the broad expanse of flat land (a plain), much of it covered in prairie, steppe and grassland, that lies west of the Mississippi River tallgrass prairie states and east of the Rocky Mountains in the United States and Canada.
west of the Mississippi River