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used to find these as a kid in the south of the Caribbean, apparently they are found worldwide in the tropics.
Maybe its not a weed yet but I think it has potential. I have found it really hard to get rid of because it suckers from the roots.
Dwarf Jade
Portulacaria afra
non-native
South African Native
http://en.wikipedia.org/wiki/Portulacari...
Gardenia (sp) maybe 'Tiare'
https://www.google.com/search?q=Tiare+ga...
Red Ginger
Alpinia purpurata
non-native
SE Asia/Pacific Native