Appendicula, commonly known as stream orchids, is a genus of flowering plants in the family Orchidaceae.

Orchids in this genus are epiphytic, lithophytic or rarely terrestrial plants herbs with many flat, often twisted leaves and small resupinate, white or greenish flowers.

[2][3][4] The genus Appendicula was first formally described in 1825 by Carl Ludwig Blume who published the description in Bijdragen tot de flora van Nederlandsch Indië.

[4] Orchids in the genus Appendicula occur from tropical and subtropical Asia to the western Pacific.

[7] The following is a list of species of Appendicula accepted by the Plants of the World Online as at December 2024:[8]