I thought Rhododendron/Azalea? but the single flower does not look right?

Rhododendron/Azalea cant survive here. Its something tropical/subtropical. Do the trifoliate leaves help in id

Any chance of close-ups of the flower and where the leaves join the stem? The details of how those are constructed could define what family it's in, which will give us a starting place for a search.

Got it identified over the net, it is Ravenia spectabilis Family: Rutaceae (citrus family) Synonyms: Lemonia spectabilis, from Cuba. I was lucky to find it in a local nursery, it looked striking!

Beautiful! I suspected Rutaceae, but when I went looking for pictures, nothing looked like it. Now I'll have to see if it will grow here in the desert. Many members of the family do.

It should, climate in southern Arizona is quite similar to ours.

It may be a little frost tender for us, but we are used to dealing with that. What I am worried about is how well it does in 46º C plus air temperatures in the day, 35º+ at night, plus whatever sun it needs to bloom. We're pretty extreme, here in the urban heat island of Phoenix!

Those temperatures are very much like ours, I will have to see how it tolerates the dry heat which we have in May and June. Its the rainy season now which is much loved by plants (temps ranging between 24 to 35 o C and high humidity) which will last till first half of September.

It gives me hope, Mochiseki! We are always looking for something different to grow, here in the desert.