43 



ONCIDIUM uniHirum. 

 One-flowered Oncidium. 



GYNANDRIA MONANDBIA. 

 Nat. ord. Orchidace^e § Vandeje. 

 ONCIDIUM. Swartz. 



Sect. II. Euoncidium; Heteranthium. Folia plana; tetrapetala ; micrc- 

 petala. Sertum Orchidacenm, t. 48. 



0. uniflorum (Booth in litt.) ; caespitosum, pseudobulbis angustis linearibus 

 squamatis sulcatis monophyllis, foliis lineari-lanceolatis obtusis undu- 

 latis apiculatis, scapo unifloro folio multo breviore, sepalis laterahbus 

 basi connatis petalisque obovato-oblongis undulatis herbaceis, labello 

 pandurato lobo intermedio maximo emarginato laterahbus nanis rotun- 

 datis sinu fimbriato, crista pubescente polydactyla lacinia utnnque hbera 

 solitaria, columnse alis truncatis erosis. 



This curious little plant, allied to the rare Oncidium bar- 

 batum, 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 are indebted to Sir 

 Charles Lemon, who received it from Brazil in August 1841, 

 through Lieutenant Turner, of H. M. Packet " linger, 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 lull 

 grown they are ovate-oblong, compressed, rather more ^tnan 

 an inch in length, and about 3-8ths of an inch m width, be- 

 coming slightly furrowed, one-leaved. Leaves oblong, lanceo- 

 late, acutef from three to four inches long, and scarcely half 

 an inch broad, thin, and a good deal recurved of a deep green. 

 Scape one-flowered, issuing from the base of the leal, and so 



