Join Date: Feb 2012
Location: South east asia
You can try Barclaya longifolia, various cryptocoryne such as Cryptocoryne becketii, balansae, lucens/lutea, various Echinodorus such as bleheri/cordifolius/, hygrophila corymbosa, Nymphaea lotus, floating plants such as duckweed,eichornia crasspipes. Java fern can survive up to 29/30, not sure about 32 ?
Haven't tried growing ground cover plants outdoors so can't comment. I suspect pogostemon helferi/downoi can take the heat as it grows in shallow rivers in full sun in thailand but I haven't tried growing it hot yet.