Jamaican Feverplant (aka Puncture Vine), native to Hawaii but introduced in the Southeast, has been added to the USWildflowers database (01/29/2019.) Scientific name is Tribulus cistoides. Photo below was taken at Coquina Beach on Anna Maria Island, Manatee County, FL on Dec 15, 2015. Go to the Jamaican Feverplant detail page for more information and photos.
Jamaican Feverplant – Tribulus cistoides