Aeschynanthus humilis 'Topaz'
(formerly A. hildebrandii'Topaz')

Photo by Ron Myhr
Grown by Paul Sorano, Lyndon Lyon Greenhouses

A very nicely grown example of this pretty variant of the species, this plant won best in class and section at the 2002 AGGS show.  The photo misrepresents the color slightly -- in real life it is less lemon-yellow, with just a touch of orange. 

The more common standard form of the species can be seen here.