Tas. L 
ONCIDIUM’ LEUCOCHILUM. 
WHITE-LIPPED ONCIDIUMN. 
ONCIDIUM.—Swartz. Act. Holm. 239. 1800. Brown in Hort. Kew. 5. 215. 
Periantuium explanatum. Sepala seepits undulata: lateralibus nunc sub 
labello connatis. Petalia conformia. Labellum maximum ecalcaratum, cum 
columna continuum, varié lobatum, basi tuberculatum v. cristatum. Columna 
libera, semiteres, apice utrinque alata. Amnthera semibilocularis, rostello nunc 
abbreviato, nunc elongato rostrato. Pollinia 2, posticé sulcata, caudiculd pland, 
glanduld oblongd.—Herb epiphyte, nunc pseudo-bulbose. Folia coriacea. 
Scapi paniculati vaginati, raritis simplices. Flores speciosi, lutei, seepits 
maculati, raro albi.— Lindley, Gen. et Sp. Orch. 196. 
Oncipi1um pseudo-bulbis ovatis sulcatis 1-2 phyllis, foliis ensiformibus scapo exaltato paniculato 
multo brevioribus, sepalis petalisque oblongis obtusis subzequalibus patentissimis, labello reniformi alt 
bilobo utrinque emarginato: laciniis lateralibus nanis retusis, cristd 3-corni basi utrinque dentato, 
columne alis acinaciformibus crenulatis. 
Habitat in Guatemala.—SK inner. 
Description. 
An EprpHyrTe. Psrupo-BULBS deeply sulcated, ovate, tapering towards the apex, compressed 
at the edges, from 2 to 4 inches long, throwing out numerous slender wiry roots. LEAVES sword- 
shaped, a foot or more long, one and sometimes two on each pseudo-bulb. SCAaPE, 3-4 feet high, 
quite erect, bearing from its very commencement numerous branches, on which the flowers are 
rather loosely scattered. Srpaxs and Prats nearly equal, oblong, obtuse, spread wide open, 
of a bright green colour, blotched with a rich reddish brown. Lrp pure white, lobed ; the lateral 
lobes small, rounded; the middle lobe broadly kidney-shaped, emarginate. CREST, consisting of 
5 tubercles, of which the two outer are thin and sharp, the 2 inner fleshy and straight, and the 
middle one, (which is much the largest, ) resembling in form the horn of a rhinoceros, pointing 
towards the base. Warnes of the CoxuMn crenulate, scimitar-shaped, of a faint rose-colour. 
THE extensive genus Oncidium, which now comprehends upwards of sixty species, contains 
none more distinct or remarkable,—we had almost said, more beautiful,—than our present subject. 
In habit O. leucochilum is large and stately, and approaches O. altissimum, Baueri, and pictum; but 
its flower-stems have the peculiarity of being branched from the very base, which we have never observed 
in any other species. Its most characteristic feature is, however, the well-proportioned pure white 
labellum, which contrasts agreeably with the dark-green sepals and petals. The rose-coloured wings of 
the column likewise add to the elegance of the flower. In O. pulchellum (which offers the only} other 
known example of a white labellum), not only is the habit totally different, but the lip is spotted 
* «So named from dyxoc, a tumour; the genus being composed wholly of species, the labellum of which bears at its base warts, tumours, or 
other excrescences.””—LinDLeEy. 
+ Something like a white Jabellwm is found in a little species, called O. Junatum ; but it is a very dirty white, and also blotched with brown. 
