This is a rhododendron (or “laurel”) for certain, but given its location in a sanctuary where native plants were rescued or relocated from other places, I’m not certain this is a common local species. The flowers were small, the clusters tight and conspicuously globular.
And with the rain that day, each funnel-horn of five petals looked as if it were made of the thinnest translucent glass, almost as if the Blashkas had created this one in their glass studio a hundred and twenty years ago. (Blashka the elder had started his career making glass eyes, if I remember correctly, and went from that utilitarian form of creativity to the most remarkable nature-reproductions you can imagine!)
So here is nature imitating art.