Large-Leafed for Full Sun
I'm only interested in plants or species of evergreen rhododendrons that can tolerate 100% full-sun in Illinois. I'm aware the PJM's are tolerable and I also have quite a few other deciduous azaleas, mostly the Lights Series, doing just fine.
I came across this list yesterday searching for zone 5 rhododendrons (I'm zone 5 even though the Arbor Day has re-zoned me into zone 5b and 6a). Especially tall rhodies but I can be satisfied with the 3-5 footers in relationship to the 8-10 footers.
Here's this link to Estrabrook's Catalogue (all are listed as "typical" Rhododendron info: part sun/wooded area - etc.) I know though that some will grow in full sun, but which I'm not sure. Living in Portland, OR I saw rhodies in the open albeit their climate is not as "demanding hot."