I think this is Chisya ternata Kunth or easier.... Mexican Orange.
Found this by using a great free app called Pl@ntNet.
I have it for Android, don't know if it is available for iphones.
You can take pictures of flowers or plants while out in the nowhere and when you have internet access again load a picture from your phone into the app and it will find it. Or if you do have internet access you can take a picture right from inside the app.