This vividly colorful perennial wildflower, Purple Poppy Mallow (Callirhoe involucrata), thrives from southern Canada to northern Mexico. Forming clumps up to 3 feet wide and 6-12-inches tall, it's absolutely loaded with tiny (1-inch or so), cup-shaped blossoms. It's drought-tolerant, likes full sun, and reseeds freely in the garden.