BURMANNIACEA. 197 
1. Apteria setacea, Nutt. in Journ. Acad. Sc. Philad. vii. p. 64, t. 9; Hook. Ic. 
Pl. t. 660; Griseb. Fl. Brit. W. Ind. p. 606. 
Apteria lilacina, Miers in Trans. Linn. Soc. xviii. t. 38. 
Apteria hymenanthera, Miq. Stirp. Surin. p. 216, t. 65. 
_ Fioripa.—Me_xico, Chinantla (Hartweg), eastern Cordillera of Oaxaca 3000 feet 
(Galeotti, 7179).—Wust Inpigs to Brazil. Hb. Kew. 
Order CXL. ORCHIDE. 
Orchidee, Benth. et Hook. Gen. Plant. iii. p. 460.. 
Bentham and Hooker define 334 genera, and estimate the number of species at — 
between 4000 and 5000. They are spread all over the world where phanerogamic 
vegetation exists, though they are comparatively rare in the polar and high alpine 
regions, as well as in dry regions. The greatest concentration of species is in the 
tropics; and they are especially numerous in the mountains of Central America and 
the north-west part of South America. Taking them tribe by tribe, the Kpidendree 
and Vandee mostly inhabit the tropics; the Ophrydee, for the greater part, extra- 
tropical countries, both north and south; and the Neottieew and Cypripediex are 
generally dispersed. Some interesting particulars of the distribution of Mexican Orchids 
by A. Richard and H. Galeotti will be found in the ‘Comptes Rendus des Séances de 
VAcadémie des Sciences’ for 1844. The illustrated Monograph of Mexican Orchids 
referred to therein, and also in the ‘Annales des Sciences Naturelles,’ série 3, iii. 
pp. 1-33, was never published. | 
Tribe I. EPIDENDRE. 
Epidendree, Benth. et Hook. Gen. Plant. iii. p. 462 et 464. 
1. PLEUROTHALLIS. 
Pleurothallis, R. Br. in Ait. Hort. Kew. ed. 2, v. p. 211; Benth. et Hook. Gen. Plant. iii. 
p. 488. 
An exclusively American genus, of which nearly 375 species have been described. 
They range from Mexico and the West Indies to Bolivia and Brazil, and mostly inhabit 
mountainous regions. 
1. Pleurothallis amena, A. Rich. et Gal. in Ann. Sc. Nat. série 3, iii. p. 16; 
Lindl. Fol. Orch. n. 134. 
Sout Mzxico. 
92. Pleurothallis angustifolia, Lindl. Bot. Reg. sub t. 1797; Fol. Orch. n. 89. 
Soura Mexico, near Jalapa (Schiede), without locality (Galeotti). Hb. Kew. 
