That Beautiful bloom does looks like a variety/cultivar of Tropical Hibiscuses (Hibiscus rosa-sinensis) to me too but I don't know which cultivar. I looked through all those with photos in the database as well as bunches when I googled but couldn't find a match. Hopefully someone will recognize it and be able to offer the cultivar name.
~ I'm an old gal who still loves playing in the dirt!
~ Playing in the dirt is my therapy ... and I'm in therapy a lot!