Prosthechea greenwoodiana
This species was only recently described in 1992 Aguirre and Olivares. It came way too late for mention in the book "The Genus Encyclia in Mexico" by Dressler and Pollard. The plant is very similar to Encyclia semiaperta (pictured top left) but the flowers of greenwoodiana are more yellow and fleshy, plus other minute taxonomical characteristics.