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ONCIDIUM CONCOLOR Hoos. 
l Jobulbi. 
Tetri 
epala microtepala : oblongis compressis sulcatis diphylli 
ligulata subito dilatato subquadrato, vulgo quadrilobo, lamellis duabus in basi, columne 
ONCIDIUM? CONCOLOR et Oncidium concolor, Hook, Bot. Mag., Ixvi., 1840, 3752! ; Lindl, Folia Oncidium, p. 21, Nr. 65 ; Rchb. f, in Walp. Ann, 
vi. 731! Rev. Hort., 1881, 30! : Warner, Williams Moore, Orchid Album, I., 1! ; Ill. Hort, ., tab, 487 ! 
Pseudobulbi oblongi compressi sulcati diphylli. Folia pergamenea, cuneatoligulata acuta. Pedunculus porrectus scu deflexus, nunc rarius ramosus, 
ine paniculatus, vulgo simpliciter racemosus. Bractea triangule parve. Flores speciosi. Sepalum impar lanceolato acutum, Sepala lateralia subaqualia, ad 
medium usque connata. Tepala submajora latiora. Labellum supra descriptum, ab ungue latiusculo subito dilatatum subquadrato obtusangulum emarginatum, 
vulgo quadrilobum. Lamelle gemine humiles in ungue. Column auricule obtusangule acuta, nunc ob apices replicatos retusa vise. Flores citrini, 
Lamelle aurantiaca, Macula seu margo alarum brunneus. 
Crescit in Brasilia. Sellow ! 
Obs. CYRTOCHILUM CITRINUM, Hook., Bot. Mag. Ixxv., 1849, 4454! consulto omissum est a me utpote quod planta valde incerta, olim et ab ill. 
Lindley, et a me huc forsan incorrecte reductum. H. G. Kehb. f. 
foliis cuneatoligulatis acutis, racemo nunc ramuloso, labello a basi 
lis ligulatis acutis vulgo apice reflexis. 
Icones analyticae. Columna ac labellum a latere, Labelli unguis. Columnae duae antice, altera cum anthera. Pollinarium. 
Many Orchidists consider that this Brazilian Oncidium is one of the loveliest Orchids yet introduced to European 
gardens. That it has few, if any, rivals among the multitude of Oncidia no one can dispute. There is no need to 
compare it with such glorious plants as O. varicosum Rogersii, Marshallianum, and others, because it has a beauty 
peculiarly its own, It is neat yet elegant it 
rowth, and the painter’s art cannot produce a purer or more beautiful yellow 
than its flowers possess. A very few years ago this Oncidium was among the rarest of the rare in gardens, but now 
it lights up numberless Orchid houses in early summer with glowing cloud-like masses of yellow, and we hope that our 
present portrait may render it even more popular. It is in one sense quite an old Orchid, having been brought to this 
country in 1837, just half-a-century ago. It was first grown and flowered in the Duke of Bedford's garden at 
Woburn Abbey, the plants having been sent by the late Mr. Gardner from the Organ Mountains in Brazil. Oncidium 
concolor was figured in the Botanical Magazine in 1840, but the drawing does not well represent the plant. 
This Orchid is so different from all other Oncidia that it may be at once recognised, and those who have seen 
it grown and flowered to perfection will not readily forget it. The finest spikes measure a foot or more in length 
and bears flowers so numerous as to form a dense wreath. The natural tendency of the flower spikes is to droop, 
and if the plants are grown in suspended baskets or on blocks, as they should be, these pendulous spikes have a 
charming effect. It isa mistake to tie the spikes erect toa rigid stake, as is sometimes done ; it destroys half the beauty 
of the plant. 
We prefer growing this Orchid on blocks ; a little fibrous peat is placed around the bulbs, and this is sufficent 
to keep the roots moist. The growing season extends from about April till October, throughout which period 
the plants, if on blocks, cannot have too much moisture, and they should, therefore, be syringed twice a-day. They 
like a cool treatment during growth and not too much shade. The Odontoglossum house suits them well during the 
growing season, but in the resting period, from October to March, the plants should be removed to a cool end of the 
Cattleya house, so as to keep them dry; during winter very little moisture is required. The plants flower in April 
and May and last a month or longer in bloom. 
Our plate was drawn from a plant in the Botanic Garden, Zurich. (Inspector : E. Ortiges.) 
