We have always called this a Mexican Broom but would like to get some more and need to know the common name or the scientific name. 

 

 

The flower looks like it is almost a sweetpea and the fragrance is wonderful.  After it flowers it puts out a bean type pod.  When the pod matures, it turns brown and starts twisting and then explodes, scattering its seeds.  The leaves are elongated thin leaves.

 

 

adair