3 Adeniums and 1 Pachypodium.

First up we have three hybridized Adenium obesum flowers with very different colors. How do they get so many colors?

Adenium obesum bloom1

1. A fairly standard, but very saturated, solid pink.

Adenium obesum bloom2

2. A crazy bi-color. Most 2-color Adenium flowers are center/edge colored, not striped like this.

Adenium obesum bloom3

3. This one is closest to the true species. And you can see the 2-colored with the petals being white towards the center and pink along the edges.

And then we have a very lovely solid yellow colored Pachypodium rosulatum flower.

Pachypodium rosulatum bloom