 They have a single leaf at their base and a single flower on a short stalk, the flower dominated by its large dorsal sepal and labellum.Species of "Corybas" are found in Australia, New Zealand, New Guinea, Southeast Asia, the Himalayas, southern China, many Pacific islands and a few sub-Antarctic islands.Orchids in the genus "Corybas" are perennial, deciduous, sympodial, usually terrestrial herbs, lacking roots.