This one is a few hundred yards from our house. It seems to have some disease that is warping the leaves but the flowers are wonderful. This bloom is several centimeters wider than the 6-8cm called for in the yellow stamen variety and closer to the 12 cm called for in the purple stamen varient. See Stewartia ovata.
We found three in bloom and two smaller plants. We tagged them at the request of our botanist friends who want to try propagating them. We'll see. Here's the Tree Trail link.