Yes, the so-called "Vireyas". I believe there is a yahoo group that discusses them. Or have a look here: http://www.bovees.com/

The vireyas are tropical. They will not tolerate a freeze. Many have very bright colors. They are epiphytes for the most part and are grown like tropical orchids.

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Vireya Rhododendron macgregoriae.

Here is a link that might be useful: Vireya Rhododendrons