43 
ONCIDlUM uniflorum. 
One-flowered Oncidium. 
GYNANDRIA MONANDRIA. 
Nat. ord. Oiiciiidace.e § Vande,e. 
ONCIDIUM. Swartz. 
beet. II. Euoncidium ; Heteranthium. Folia plana; tetrapetala ; raicro- 
petala. Sertum Orcliidaceiim, t. 48. 
0. uniflorum (Booth in litt.) ; caespitosura, pseudobulbis angustis linearibus 
squamatis sulcatis monopbyllis, foliis lineari-lanceolatis obtusis undu- 
latis apiculatis, scapo unifloro folio multo breviore, sepalis lateralibus 
basi connatis petalisque obovato-oblongis undulatis berbaceis, labello 
pandurato lobo intermedio maximo emarginato lateralibus nanis rotun- 
datis sinu fimbriato, crista pubescente polydactyla lacinia utrinque libera 
solitaria, columnar alis truncatis erosis. 
This curious little plant, allied to the rare Oncidium bar- 
batuin, inhabits trees in the forests of the Organ Mountains 
of Brazil, where it was found in April 1841, by Mr. Gardner, 
to whom I am obliged for specimens. 
For its introduction to gardens we arc indebted to Sir 
Charles Lemon, who received it from Brazil in August 1841, 
through Lieutenant Turner, of H. M. Packet “ Ranger,” and 
in whose collection at Carclew it flowered in November 1842. 
Mr. Booth has favoured us with a drawing, and the following 
account of it. 
“ Pseudobulbs when young roundish oblong, covered with 
several ovate, acuminate, sheathing scales ; but when full 
grown they are ovate-oblong, compressed, rather more than 
an inch in length, and about 3-8ths of an inch in width, be- 
coming slightly furrowed, one-leaved. Leaves oblong, lanceo- 
late, acute, from three to four inches long, and scarcely half 
an inch bioad, thin, and a good deal recurved, of a deep green. 
Scape one-flowered, issuing from the base of the leaf, and so 
