Butterfly orchid

This beautiful species of Orchid seemed to be growing out of a wall at the entrance to Asa wright's it was quite alrge and very striking with its bright yellow and orange markings.The flowers are 13-15 cm (5-6") long and have an extremely long life. marked with a yellow transverse stripes, the sickle-shaped, bright chestnut-red lateral sepals have wavy edges with occasional yellow markings. The large, 3-lobed lip is about 4 cm long (1.6") and 3.5 cm (1.4") wide.