Douglas Justice, in his April blog: April 2015 in the Garden | UBC Botanical Garden, talks about lepidote (scaly-leaved) rhododendrons, or azaleas. The only one I have from Douglas's list is Rhododendron augustinii. Maybe I was a bit early. But I found others that I think are lepidotes. Rhododendron 'Leonard Messel' [edited 2015apr30: I'm adding a photo of the limbs] Rhododendron schlippenbachii This nice one on the main path that I didn't find the name for [edited 2015apr30: Daniel posted the name - Rhododendron davidsonianum] I think this is lepidote, could be corrected, Rhododendron tubiforme.