Source for Swamp Azalea (R. viscosum)
This past weekend I went to the Congaree Swamp National Park (it's about 40 miles southeast of Columbia SC) and noticed a flowering shrub; the park ranger said it was 'swamp azalea' (Rhododendron viscosum). It's a deciduous azalea that makes clusters of small trumpet-shaped flowers; it apparently is also a good plant for fragrance, and attracts hummingbirds and butterflies.
I googled the name, but I couldn't find any nursery that listed that plant; or, more accurately, the few that did list that plant were all out of it.
Anybody know of a source for those plants, or even seeds for those plants? From what I gather, there are a few different cultivars of that species.
I'm roughly equidistant from Charlotte NC and Atlanta GA, and I'd be willing to drive to either place or near either place to obtain some of those plants.
Thanks in advance for any suggestions/guidance