Yes, it's a Plumeria - which one I can't say - believe it will have to bloom to accurately i.d. it. I have some huge Plumeria plants that are years old and have never bloomed - no idea why, so I wait patiently - they will bloom when they're ready!
I have a sp. Alba plumeria that I grew from seed...yours greatly resembles it. The only difference that I can tell is the leaves on yours look a bit wider, but it could just be the 'up close' photo shot.
The sp. Alba is an evergreen.
Thanks for the input, Chell. By "evergreen" you mean doesn't drop leaves seasonally, right? This one has dropped and not dropped, but I think the dropping may have been transplant stress. I'm looking up 'Alba', thanks.
The leaf nodes on mine are much more closely than those on ClareCA's nice shots in PlantFiles. But she certainly provided MUCH better growing conditions than I have --and presumably more friendly than those mine found in its niche on a rock point right on the Caribbean, sprayed with salt by trade winds and dried by 18 degree N latitude sun.
Clare's shot of alba's leaf aside various other plumeria leaves makes me think mine's alba.
So, perhaps my find is not rare, but I'll raise her as a Caribbean native "pioneer", with a personal story.
Picture's attached were taken on the beach where I found her. First is not the same rock point, but one at the other end of the same beach. The "soil" is what collects on a bubbly, glassine lava with edges so sharp you could slice off a toe if you tried to run. Second is from back in the sea grape grove at the dune line.
Wish I were there right now...it's freezing here in Washington DC!!