Porroglossum (from Greek porro = forward and glossa = tongue", referring to the position of the lip) is a genus of orchids native to the Andes of South America. The center of diversity lies in Ecuador, with many of the species endemic to that country, though others are found in Colombia, Venezuela, Peru, and Bolivia at elevation of 1000-300m. This genus is abbreviated Prgm. in horticultural trade.
The lip in this genus is unique in the family of orchids. It is hinged and has a mechanism that snaps shut when stimulated by a pollinator, thus trapping the insect to ensure that the pollinia will be removed and later transferred to the receptive surface. The lip opens after 30 minutes or so to release the insect, but also closes at night and reopens at dawn.
The plants are very small and related to Masdevallia. They can be cultivated mounted or in pots, they like high humidity especially in the morning and in the evening, and are sensitive against too much fertilizer. Best is care in show cases or cabinets.