Bud, thanks for posting your photos over here for us. Iochromas & Brugmansias ARE very closely related members of the Nightshade family, which is large & diverse. It includes many plants we're more familiar with, such as petunias, tobacco, tomatoes and potatoes.
As you noted, Iochromas often "hide" their bloom clusters amongst the foliage. These plants will need to be taken in for winter protection - they're not cold hardy. I've read they aren't as happy with dormant storage as Brugs, but I put mine in my heated garage right along with the Brugs. They need just enough watering over the winter to keep them from dying. They'll lose their leaves, then put out new growth in the spring.
During the growing season I fertilize them often. I'm not sure what's recommended, but I feed them about every 2 weeks, when I'm feeding the Brugs (they're fed weekly, so I "hit" the Iochromas every other time). They seem to perform better if not restricted to smaller pots, so I up-pot as seems appropriate for the plant size.
I'll be watching for hummer activity on my I. fuchsioides when it starts blooming. I've seen hummers around them before, but was never sure if they were just checking out the bright red blooms or actually happy to feed from them.
Patrick
USDA Zone 8b
Heat Zone 3
Sunset Zone 5
SeaTac, WA...one cool place
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