132 CXLVIII. ORCHIDEX. (J. D. Hooker.) [ Habenaria. 
The structure of the stigma has been compendiously described by Bentham in the 
Journal of the Linnzan Society (xviii. 356), and I agree with him in thinking that 
to found genera on the modifications or even in the presence or absence of processes, 
would lead to a violation of affinities. 
For observations on the Indian species referred to Orchis, see that genus. 
The characters which I have taken for the primary groups, marked A and B, 
of lateral sepals reflexed spreading or deflexed, and erect or ascending, are in most 
cases obvious; but in dried specimens of some species placed in Sect. V. it 1s 
difficult to say whether the lateral sepals are reflexed naturally or accidentally, or 
whether, though erect in early flowering. they afterwards spread. The root and its 
tubers require investigation throughout the genus. 
The staminodes present great variety ; in most species they are mere warts on 
the sides of the anther, butin several not otherwise allied they are linear or styliform 
processes, attached either to the anther or base of the column, as in Diphylaz and 
Dithriz. 
At the end of the genus I have placed four monotypic sections founded on plants 
differing remarkably in habit from any of their congeners ; some of these will, 
expect, eventually be regarded (and rightly) as monotypic genera, but in my present 
imperfect knowledge of any but the Indian species of this very large genus, I prefer 
keeping them as sections, awaiting their confirmation as genera under the authority 
of a monographer of the whole tribe of OpArydec. 
KEY To THE SECTIONS. 
A. Lateral sepals spreading deflexed or reflexed. 
In some small -flowered species of Sect. v. Peristylus, the lateral sepals appeat 
to be spreading or deflexed during or after flowering, and might hence be placed in 
ct. iii. 
Sect. I. Arr. Petals truncate 2-fid or 2-partite. Lip 3-lobed or 
-partite. (Sp. 1-14.) 
Sect. II. PrATYGLOSSA. Petals entire. Lip 3-lobed or -partite, side 
lobes, broad (narrow in H. platyphylla) petaloid, mid-lobe narrow. (Sp. 
Sect. III. TRIMEROGLOSSA. Petals entire. Lip 3-partite, side lobes 
very narrow, entire, usually filiform (lip entire in Peloria forms of 
Mandersii and reniformis). (Sp. 35-66.) 
Sect. IV. Horocrossa. Petals entire. Lip entire, linear. (Sp. 37-66.) 
B. Lateral sepals erect, or ascending parallel to the dorsal and petals, 0 
forming a hood with these, rarely at length spreading or deflexed. 
Sect. V. Peristyius. Petals entire. Lip usually 3-fid or 3-partite 
(entire in H. breviloba).— Flowers usually very small, and petals broader 
than the lateral sepals and often fleshy ; spur rarely exceeding the ovary, 
usually very short or saccate. (Sp. 67-99.) 
Sect. VI. Puyttostacuya. Petals entire. Lip broad, entire, petaloid ; 
spur conico-infundibular. Flowers large, in the axils of sheathing leaves; 
105102) processes 0; rostellum obscure. (See also 32. H. triflora.) (Sp. 
0-102. 
ABERRANT SPECIES (OR GENERA P) OF GROUP B. 
. VII. PrEcroGLOssa. Flowers large, in the axils of imbricating leave 
Lip coriaceous, clawed, 3-fid, longitudinally 3-plicate in bud, spur long 
NEA y igmatie processes large, rhomboid ; rostellum broad, triangular 
P. . 
