112 DR. HOOKER AND DE. THOMSON'S PRECURSORES 
We add a key to the species, arranged under their countries, 
but have little confidence in its proving a certain guide to 
determining them systematically,— our object in this, as with the 
other Precursores, being to bring together all the available matter 
regarding each genus, rather than to present it in a completely 
elaborated systematic form *. 
CONSPECTUS SECTIONUM. 
A. SCAPIGERE. Rhizoma breve, perenne. Folia omnia radicalia. 
Scapus gracilis, apice racemifer.—(Bractee patentes pedi- 
cellis multo breviores, carnosule. Pedicelli graciles. Sepala 
latiuscula. Labellum saccatum v. calearatum. Ale 2-3-lobe. 
Vexillum fornicatum. Capsula late elliptico-oblonga v. lan- 
ceolata. Semina pustulata, minima.) (Sp. 1-5.) 
A perfectly natural group, and readily recognized, confined to 
the western peninsula and Ceylon. 
B. OrPosrrrroLrx. Annus. Folia omnia opposita v. in paucis 
alia opposita, alia ternatim verticillata. Pedicelli solitarii v. 
fasciculati, uniflores, rarissime (in T. salicifolia) 2-flores.— 
(Sepala angusta, labello plerisque concavo calcarato v. mutico, 
rarissime saccato. Vexillum ssepius breve. Ale non caudate. 
Capsula brevis,medio turgida, utrinque attenuata, in Г. K leinii 
solum subcylindrica et I. salicifolia clavata. Semina magna, 
testa levissima.) (Sp. 6-20.) 
For the most part a very natural group. J. salicifolia is the 
chief exception, its 2-flowered states being referable to D. Many 
of the species are very doubtful, and the synonymy is confused, 
the original specimens being in many cases bad, or badly named 
in Herbaria. The Т. pendula and Mysorensis, though alternate- 
leaved, should naturally come into this group; and single-flowered, 
opposite-leaved specimens of leptopoda ?, radicans, and others of C 
may be referred to it. 
C. SuBVERTICILLATE. Folia omnia subopposita, v. inferiora al- 
terna, superiora opposita v. verticillata. Pedunculi 1—oo -flores. 
(Sp. 21-33.) 
А. very artificial group, divisible into those with one-, and those 
with two- or more-flowered peduncles. Occasional specimens of 
* Whilst these pages were passing through the press, a Number of the 
‘Madras Journal of Science’ (Sept. 1858) has been announced, containing an 
important paper by Lieut. Beddome on the Peninsular species, to which I 
shall refer at the end of this monograph.—J. D. H., Kew, Nov. 10th, 1859. 
Г 
