Allamanda cathartica is native to South America and belongs to the Apocynaceae family.  The bright yellow flowers, shown here, are funnel-shaped and make quite a dramatic show.

The florescence of Brighamia Insignis is quite interesting.  The pollen of this plant is ready to go prior to the stigma being viable.  This scenario places the plant in the Campanulaceae family although it was previously listed as a member of the Lobeliaceae family.  Hand pollination with a small artist brush usually is successful.