Orchids are also collected for export in the districts of Garanhuns and Timbauba.
For Flora: Maiden, Useful Native Plants of Australia (Sydney, 1889); Bentham and Mueller, Flora Australiensis (London, 1863-1878); Fitzgerald, Australian Orchids (Sydney, 1870-1890); Mueller, Census of Australian Plants (Melbourne, 1889).
In the roots of some palms and orchids a polystelic structure obtains.
As in the IndoMalayan sub-region, epiphytic orchids are probably most numerous in point of species, but the genera and even sub-tribes are far more restricted in their range than in the Old World; 4 sub-tribes with 74 genera of Vandeae are confined to South America, though varying in range of climate and altitude.
Ground orchids and tree orchids are well represented; Polystachya liberica, an epiphytic orchid with sprays of exquisite small flowers of purple and gold, might well be introduced into horticulture for its beauty.