Sinningia sellovii

Photo by Ron Myhr
Grown by Jack Pardo

Shown at the AGGS Convention show, 2004.  Note the huge tuber and extremely robust stems.  A close-up of the flowers can be seen here.

There are a number of photos of S. sellovii on the site:

S. sellovii yellowish form, available light and flash
S. sellovii shown at AGGS Convention 2004, flowers and whole plant/tuber
S. sellovii photos at the Smithsonian, flowers and stems
S. sellovii flowers, Toronto show 2004
S. sellovii with hummingbird