Iochroma is in the Nightshade family of Solanaceae which includes tomato plants and Brugmansia -Angels Trumpets. They attract hummingbirds and bees.
I searched for it at many local nurseries without luck. I finally mail ordered the purple, blue and red from Logees Nursery. I love the purple and blue. But the red one I'm not so happy about. It has bigger leaves and very small flowers. We'll see. This year I found a pink one that I ordered from Almost Eden Nursery. It came already about 8" tall. I potted it into a 2 gallon can right away and it already bloomed. It's lovely!