Is it a bush .Mine climbs go to my blog and look .See if its the same thing .I also have a Hibiscus. Check it out.
My sister had one like that and the name on the tag was Crossandra. They look like the mandevilla but are yellow and are a shrub instead of a vine. I'll bet it is a Crossandra!!
The neighbor's love it because it goes threw the fence and they get plenty of flowers. I was asked not to cut them lol.
Well it's called Allamanda. Saw them at home depot. I also have Dwarf Allamanda. Here are some pic's of the dwarf ones.