Oncidium alexandrae, synonyms including Odontoglossum crispum, is an epiphytic orchid in the genus Oncidium. Known as the curled odontoglossum, it is considered by many to be the most beautiful orchid of all but is also one of the most difficult to grow.

Joseph Henry Chesterton was a British plant collector who was sent by James Veitch & Sons to search for orchids in South America with much success.