Full disclosure, this deciduous shrub is found in central to eastern montana (think east of the Divide). However, it has earned a spot in our lineup because it is low-maintenance and drought-tolerant, and can act as structure in your garden and shelter for more sensitive species. It doesn't get very tall, but rather tends to sprawl outward and it can tolerate many soil types, including clay. The flowers are inconspicuous but the rusty red fruits look pretty neat. Like most shrubs, it provides excellent cover for small wildlife. 
 
This shrub is great for that dry sunny spot that just needs something more substantial than a bunchgrass. And bonus, it's ok with partial shade as well. If you are planning a thicket planting, three-leaf sumac would go towards the front.