ID Tropical flowers

I am a national geographic photographer who does a lot of macro plant work. I was hoping someone might have an idea what these flowers are called. I took them in Fiji. See attached images. I have gone crazy looking on line for them. Thanks

 

136 is Ixora of some description, maybe a cultivar of I. coccinea (which is common as a decorative planting across the tropics)
8435 is Ixora coccinea - unknown cultivar.
4645 is Tibouchina or a close relative - without seeing the plant and leaves it's going to be difficult to pinpoint a species.

Do you have a photo of the actual flower of 4639? It's quite difficult to ID without open flowers, leaves, or other clues as to plant habit.

 

Thanks for your help. You were right. I have attached the requested flower that I need an ID

 

Caesalpinia pulcherrima.

 

Yup, that's Casealpinia pulcerrima all right.

 

4645 might be Jatropha integerrima.
http://www.google.com/search?q=jatr...JEbT-sQKB6KirCA&ved=0CC0QsAQ&biw=1025&bih=484