wildflowers said:Clover is a favorite of bees. There are probably some that are suitable or native to your state. Native Purple Prairie Clover, Dalea purpurea might be a good choice - good nectar and pollen plus purple is always attractive to bees. It can also be grazed by cattle and wildlife.
Purple Prairie Clover (Dalea purpurea)
Bonehead said:I would get in touch with your local extension service or native plant society. They may have seed sources and/or planting plans. Dandelions are good for bees as well.