MB. G. BEtfTHAH OX OBCHI0E.E. 351 



Europe, Asia, Mediterranean Africa, and America, or southern 

 in Africa. Very few small genera have any species in tropical 

 Asia or Africa and none in America, except the large genus 

 Habenaria, which, although it be, like the rest of the tribe, chiefly 

 extratropical, has a few species scattered over the tropical regions 

 both of the New and the Old World. 



However well defined the whole tribe may be, the genera are 

 often very much the reverse, and very difficult to distribute 

 plausibly into subtribes. The folio-wing four, slightly modified 

 from Lindley's six, are the best I have been able to devise. 



Subtribe 1. Sekapiadeje. — Anther erect above the rostellum, 

 the gland of the pollinarium single or double, enclosed in a single 

 one or in two distinct pouches raised from the back of the ros- 

 tellum. This subtribe comprises the four genera Orchis, Serapias, 

 Aceras, and Ophrys. Orchis, Linn., now contains nearly eighty 

 species, from Europe, temperate Asia, and Mediterranean Africa, 

 with two somewhat anomalous ones from North America. They 

 have all a spurred or pouched labellum, and the glands of their 

 pollinarium are enclosed in a single pouch; the two glands usually 

 distinct and either closely contiguous or quite separate, but in a 

 i'evr species they are more or less perfectly united into a single 

 one. This character has induced the separation of these species 

 into several distinct genera, which, however, have not been very 

 generally adopted. Thus Barlia, Parlat., is the 0. longibracteata, 

 Biv., which in habit and all other characters is a true Orchis. 

 Loroglossum, L. C. Rich., comprises O. hircina, Linn., and two 

 allied species, in which the long strap-shaped labellum has the 

 basal spur reduced to a short pouch. Comperia, 0. Koch, is 0. 

 Comperiana, Stev., in which the labellum has four long tail-like 

 points. Anacamptis, L. C. Rich., is O. pyraniidalis, Linn., and 

 Traunsteineria, Reichb., is O. globosa, Linn., which in their habit 

 seem to connect Orchis with Habenaria ; and in 0. globosa the 

 glands of the pollinarium are said by some to be naked, as in 

 Habenaria ; but they certainly appear to me to be enclosed in a 

 pouch, as in Orchis, though the pouch be of an exceedingly thin 

 texture. The two North-American species, 0. spectabiUs, Linn., and 

 O. rotundifolia, A. Gr., with a very different habit, are also near 

 Habenaria, and, like some North- American species of that genus, 

 have no underground tubers ; but the pouch of the pollinarium 

 is certainly that of Orchis, of which they might form a distinct 

 section. Serapias, Liuu., four or five species from the Mediter- 



