I've had a few replies to the Flora challenge and so far Andrea has been the most convincing. Still looking to identify flowers 1 and 4 so keep those entries coming.

Andrea from Argentina writes:

Picture #2: 
Common name: Golden trumpet./yellow allamanda Scientific name: Allamanda cathartica  
Picture #3: 
Common name: Bougainvillea 
Scientific name: Bougainvillea spp. 
Picture #5 & #6: 
Common name: Hibiscus 
Scientific name: Hibiscus rosa-sinensis (actually, this happens to be the national flower of Malaysia. Thanks Google) 
Picture #7: 
Common name: Brazilian flame bush 
Scientific name: Calliandra tweedii