ONCIDIUM UNDULATUM. 
|PLaTE 368, ] 
Native of New Grenada. 
An epiphytal plant, with large ovate pseudobulbs, which, when young, are 
smooth and deep green; with age, however, they become ribbed and wrinkled, but 
never taper to a point, as do those of its near relative, Oncidiwm superbiens. 
Leaves oblong-lanceolate, strongly ribbed, and deep green. Scape some ten or more 
feet in length, much branched and many-flowered, bracts at the base of the pedicels, 
large, somewhat cymbiform. Flowers between two and three inches across; sepa 
large and clawed, the dorsal trulliform, somewhat reniform at the base, slightly 
incurved at the apex, the edge unequal and plain, lower sepals spreading, oblong 
obtuse, slightly imcurved at the points, the colour being throughout of a 
bronzy brown, with a central band of pale green; petals larger than the sepals, 
clawed, oblong-cordate, emarginate, white, the lower half blotched with purplish mauve, 
spotted with purple on the upper margin, and flushed with irregular feathery streaks 
of yellow; lip small, triangular, ligulate, recurved at the apex, and of a uniform 
rich purple. Colwmn small, recurved. 
OncipIum uNnpuLATUM, Lindley, Sertum Orchidaceum, sub. t. 48; Id. Folia 
Orchidacea, art. Oncidium, No. 15; Reichenbach fil., Bonplandia, 1854, 
CyRTocHILUM unpuLATUM, Kunth, Humboldt, Bonpland and Kunth, i., t. 84. 
This Oncidium belongs to the paniculate, or Cyrtochiloid group, and although we 
have already figured several fine species belonging to this section, new discoveries 
continually afford us fresh materials to illustrate. The plants of this group 
really rank amongst the most noble and beautiful of Oncidiums, of which the 
portraits of O. lamelligium and O. superbiens have already appeared in former 
numbers of the Atsum; their long many-flowered racemes of showy blooms rendering 
them very effective when they are naturally disposed. The species here represented 
is very distinct and rare, differing particularly from the majority of its congeners, 
which have for the most part yellow flowers, and therefore it becomes more welcome in 
arranging for effect, and for contrasts of colour. This Cyrtochiloid group of Oncidiums 
differs from the majority of the genus, in which the great display is produced by 
the lip; but here the lip is reduced to small proportions, and the great beauty 
of the flower is furnished by the enlarged sepals and petals. We are enabled to 
lay before our readers the portrait of this beautiful plant, through the kindness 
of R. J. Measures, Esq., Cambridge Lodge, Camberwell, in whose fine collection 
it bloomed in the early part of last year; the long spike bearing twenty-four 
flowers, 
