1) To prevent crawling animals form taking nibbles on it, the sepals are fused into a flat, rigid, sharp-edged, star-shaped collar.
2) has very long, thick, and nearly rigid sepals that stick straight out to catch the attention of pollinators. The petals are tiny by comparison.
3) has rough, crumpled, petals.
4) is like #1 in that it protects itself from crawling animals by having sharp needles at the end of each petal.
5) has numerous bladder-petals that form into spheres. Pollinators must climb between and underneath to reach the nectar below. While feeding, the pollinators are thus hidden and protected from predators.
6) The males and females of this species have petal designs that are mirror images of each other. The pollinators have a psychological need for balance and so alternate the sex of the flower they visit.
7) is shown below. It's pretty.