Nematanthus corticola

Photo by John Boggan
Grown at Smithsonian Institution greenhouses

A number of Nematanthus have flowers dangling beneath the foliage on long pedicels.  N. crassifolius and N. brasiliensis are other good examples, as is N. 'Stoplight', a hybrid of fritschii and longipes.  Other photos of N. corticola can be seen here and here -- note that the length of the pedicel does vary significantly.