Megacorax is a monotypic genus of flowering plants belonging to the family Onagraceae.

[2] It was found in Sierra de Coneto, Durango.

[3] The genus name of Megacorax is in honour of Peter H. Raven (born June 13, 1936) is an American botanist and environmentalist, notable as the longtime director, now President Emeritus, of the Missouri Botanical Garden.

[3] The Latin specific epithet of gracielanus honors the botanist Graciela Calderon Diaz Barriga.

Both the genus and species were first described and published in Novon Vol.12 on page 361 in 2002.