Aeschynanthus tricolor

Unknown photographer, courtesy RBGE
Grown at Royal Botanic Gardens, Edinburgh

Aeschynanthus tricolor is a variable species, with the characteristic bowl-shaped calyx coming in a wide variety of colors.  An example with a red calyx can be seen here, and another with a pink calyx here.  A. tricolor is similar to A. cordifolius;  the names may be synonyms.