white, unguiculate, ovately round, margin dentate or undulate, obtuse, 
unguis about three lines long. Lamella of the labellum yellow, cup¬ 
shaped, fleshy, united in the fore part, about three lines long, striped 
in the centre with scarlet. Column curved, about six lines long, wing¬ 
less, but membranaceous at the edges. Stigmatic cavity ovate, about 
half the length of the column, and tinted with pink at the margin. 
Anther 2-celled, beaked, the apex partaking of the same colour as 
the edge of the stigmatic cavity. Pollen masses two, pear-shaped, 
posteriorly sulcate. C audioula linear. Gland hooked. 
Popular and Geographical Notice. The genus Odontoglos- 
sum w^as made by Humboldt and Kunth from the collection of Or- 
chidese, collected by Humboldt and Bonpland during their travels in 
South America. It is, obviously, very nearly related to the genus 
Oncidium, from which it is not easily separated, unless you depend on 
the structure of the labellum and gland; the former of which is entire 
and unguicLilate, the latter hooked. 
The species composing this genus are natives of South America, 
and of which there are about twelve species known. Their flow^ers 
are handsome and showy. Although this is a very showy species, yet 
it is not equal in beauty to several species yet to be introduced into 
this country, such for instance as Odontoglossum nebulosiim, whose 
flowers are stated to be in circumference nine inches, and Odontoglos- 
sum Cervanteii, ^yhich approach those of our present species, but are 
much larger and richer tinted. There is probably little doubt that 
from the exertions of Baron Hartweg, who has been exploring the 
nucleus of these plants, viz. Oxaca, at the expense of the London Hor¬ 
ticultural Society, that if they are not at present in that collection, 
they shortly will be. 
Introduction; Where grown; Culture. This plant was im¬ 
ported from Mexico in the year 1837, by George Barker, Esq. where 
it was found by his collector, Mr. Ross. Our figure was taken from 
a plant in the collection of the London Horticultural Society. 
It should be cultivated in a warm and damp stove, and may be pot¬ 
ted in the same way as other species of this tribe; or if preferred, itmay 
be put on a piece of wood, and suspended from the top of the stove,as 
many other epiphytes. Its propagation is similar to many others 
■—merely dividing the pseudobulbs. West. 
Derivation of the Naaies. 
The generic name Odontoglossuai is from Ocovq a tooth, yXioaaa a tongue, in 
reference to the toothings at the base of the labellum : the specific name 
Rossii is in compliment to Mr. Ross, the collector of G. Barker, Esq.in Mexico. 
SvNONYAIB. 
Odontoglossfai Rossii. Lindh Bot. Reg. N. S. 1839, t. 48, 
