290 THE ORCHID REVIEW. [OcroBER, IgII. 
of some nineteen genera in which the lip is free from the column, and 
spurless, while the stems are mostly pseudobulbous, and terminated by one 
or two leaves. Oncidium is a very large and polymorphic genus of over 250 
species, differing greatly in habit, and the majority of the species bearing 
yellow and brown flowers, a few however being white, often more or less 
blotched with purple. The sepals and petals are often relatively small; 
the lip and column usually diverging from the base, while the lip is large, 
membranous, and often pandurate in shape, with a rather tubercled crest. 
In the Cyrtochilum group, however, the lip is small and fleshy. The genus 
has almost the wide distribution of the subtribe. 
Odontoglossum extends from South Mexico along the Andes as far as 
South Peru and Bolivia, and contains over 80 species. It is nearly allied 
to Oncidium, and difficult to distinguish by absolute characters, though the 
stalk or base of the lip is usually nearly parallel with the column, and the 
limb spreads at a distinct angle, and is rarely pandurately-trilobed, and the 
crest different. The lip varies greatly in detail, and in the section 
Myanthium it is small and fleshy, as in the Cyrtochilum section of 
Oncidium. 
Miltonia is nearly allied to Odontoglossum, and includes a few species 
formerly placed with the latter. It was originally based upon a small 
group of Brazilian species, but was afterwards extended to include the 
Colombian Odontoglossum vexillarium and its allies, and more recently the: 
Central American O. Schroederianum, and a few others have also been 
transferred to it. It now contains about 20 species, most of which are in 
cultivation. The lip is usually sessile at the base of the column, entire, and 
seldom distinctly lobed. 
Brassia differs from Oncidium in having narrow acuminate or tailed 
sepals and petals, and has a pretty similar distribution to that genus. 
About thirty species are now known. Ada is nearly allied to Brassia, and 
contains two Colombian species with orange-coloured flowers. Erycina 
contains a single Mexican species which was formerly referred to Oncidium, 
and much resembles it in general character. Leiochilus is Mexican and 
Central American, and contains about eight dwarf species, two or three of 
which are known in gardens. Gomeza is a small Brazilian genus of about 
ten species, several of which are in cultivation. 
There are several other small genera, which are occasionally seen in 
cultivation. Abola and Solenidium are Colombian, Sutrina Peruvian, 
Rusbyella Bolivian, Cohnia from Nicaragua, Sonderella, Theodorea, and 
Dipteranthus Brazilian, while Trizeuxis is from Colombia and the West 
Indies, all being monotypic. Mesospinidium (not to be confounded with 
Cochlioda) has three species, natives of Colombia and Brazil, while the 
four species of Neodryas occur in Peru and Bolivia. 
