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Zelenkoa is a genus of flowering plants from the orchid family, Orchidaceae. It contains only one known species, Zelenkoa onusta, native to Panama, Colombia, Ecuador and Peru.

Zelenkoa onusta is an epiphytic desert orchid, that survives in the harsh dry conditions of Ecuador and Peru between 25 & 1200 meters and in direct sunlight. This species often grows on barren brush and cacti. Its pseudobulbs will harden in dry months and enlarge with moisture during rains and fog. Zelenkoa onusta blooms are 2 cm wide, with numerous yellow flowers in the summer and autumn.