Maxillaria is a well-known genus of neotropical orchids, favored by cultivators for their showy flowers and being easy to grow. The plants are rather smaller than other orchid genera, and the stems usually bear only one flower. (Photos are of cultivated specimens.)
This orchid is from the neotropical genus Maxillaria. As with most orchids, the intricate shape of the flower is to tempt a male insect (usually a bee) to visit.
This is probably another Maxillaria (possibly a variety of M. rufescens).