Thanks for all your help. I still have the following unidentified:

4, 14, 18

1. stephanotis as per LisaTWade, Jasmine

2. A variety of Rose

3. Sunflower

6. Rose

7. Rose

8, 11, 16. Marigold

9. Bouganvilla

10, 17 & 5: coreopsis

12: Rudbeckia Gold

13. Impatiens

15. Dahlia