Tas. XXXIX. 
ONCIDIUM WENTWORTHIANUM: 
EARL FITZWILLIAMS ONCIDIUM. 
Trisus: VANDE ®.—LiInp-tey. 
Oncipi1um Wentworthianum; pseudo-bulbis nebulosis oblongis compressis ancipitibus diphyllis, 
panicula angusté elongaté ramulis 3-5 floris sepalis liberis petalisque oblongis lanceolatis acutis, labelli 
cordati laciniis lateralibus rotundatis gross? crenatis intermedia multd brevioribus ; intermedia ungue basi 
lato apice angustiore lateralibus rectis lamina reniformi denticulata basi ipsa labelli duplo angustiore, crista 
5-dentata denticulis 2 anticis aucté, columne alis erosis brevibus.—Lindl. Bot. Reg. Misc. 194, 1840. 
Habitat in Guatemald.—Sxinner, Hartwec. 
Description. 
PSEUDO-BULBS oblong, compressed, with sharp edges, usually about three inches long, but in 
some varieties considerably larger, of a very dark green colour, beautifully clouded with brown. 
LEAVES two on each pseudo-bulb, shining, lanceolate, acute, from six inches to a foot long. 
FLOWER-STEM extending in a wavy irregular line to the length of three to twelve feet, producing 
numerous short, few-flowered, lateral branches. Sepats and PETALS nearly alike, oblong, lanceolate, 
acute, of a rich yellow ground, strikingly marked with spots and streaks of the most intense reddish 
brown. Lp three-lobed, the lateral lobes crenate, rounded, and much shorter than the intermediate 
one, at the base of which is placed a short kidney-shaped plate, the edges of which are erect and 
toothed ; on this plate is the crest, composed of five pointed processes, with two smaller teeth in 
Jront. The wings of the CoLumn are short and bitten off. 
ONCIDIUM Wentworthianum—so called, it is needless to say, after the noble proprietor of Went- 
worth-;—is among the most elegant species of the vast genus to which it belongs. The beautifully clouded 
pseudo-bulbs are a very remarkable feature, especially in a wild state, for, in cultivation, the markings 
frequently become indistinct ; the great length of the flower-stems—not less, in some instances, than ten or 
twelve feet—and the shortness of the lateral branches, also serve to characterize the species. 
It is a native of Guatemala, where it was first discovered by Mr. Skinner, and its natural habitat 
being usually in the higher lands, a moderate temperature is required for its successful culture. The 
specimen from whence the figure was taken flowered at Knypersley in 1840, since then many superior 
varieties have appeared, especially in the garden of the Horticultural Society, to which Mr. Harrwea 
sent them. 
* Supra, Tab. I. 
+ The collection of Orchidaceous plants at Wentworth was, perhaps, the very first in which the manifold attractions of this beautiful tribe were 
developed on an extensive scale, and under the care of Mr. Cooper, the veteran curator, its celebrity is well sustained. 
