43 



ONCIDlUM uniflorum. 

 One-jiowered Oncidium. 



GYNANDRIA MONANDRIA. 

 Nat. ord. Orchidace^ § Vande^. 

 ONCIDIUM. Swarts. 



Sect. II. Euoncidium ; Ileteranthium. Folia plana; tetrapetala ; micro- 

 petala. Sertum Orcliidaceura, t. 48. 



0. unijlorum (Booth in litt) ; cscspitosum, pseudobulbis angustis linearibus 

 squamatis siilcatis monopbyllis, foliis lineari-lanceolatis obtusis nndii- 

 latis apiculatis, scapo unifloro folio mult6 breviore, sepalis latcralibus 

 basi connatis petalisque obovato-oblongis undulatis berbaceis, labello 

 pandurato lobo intei'mcdio maximo emarginato lateralibus nanis rotun- 

 datis sinu fimbriato, crista pubescente polydactyla lacinia utrinque libera 

 solitaria, columnse alls 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 are 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. 



** Pseudohulbs 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 broad, thin, and a good deal recurved, of a deep green. 

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



