Columnea polyantha with hummingbird Phaetornis superciliosus

Photo by C. Kastinger
Growing in nature

Hummingbirds are typical pollinators of species of Columnea.  They can be attracted by the bright yellow or red of the flowers themselves, by red markings on the leaves or by brightly colored calyces or bracts.  Other photos of this species can be seen here and here.