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ONCIDIUM bicallo'sum, 

 Two-warted Oncidium. 



GYNANDRIA MONANDRIA. 

 Nat. ord. Orchidace^e § Vande^e. 

 ONCIDIUM. Swartz. 



Euoncidium ; Heteranthium ; Folia plana ; Pentapetala ; Micropetala ; 

 labello pandnrato ; i. e. medio constricto basi angustiore. Sertum Or- 

 chidaceum sub t. 48. 



O. bicallosum ; bracteis ovatis membranaceis obtusis, sepalis liberis obovatis 

 concavis, petabs oblongis obtusis, labelli lobis lateralibus abbreviatis in- 

 termedio maximo transverso emarginato subcordato, crista bicallosa, 

 tuberculis distantibus xino ante alteram posito rugosis subtrilobis, co- 

 lumnse auriculis linearibus falcatim recurvis. Lindl. in Bentham pi. 

 Hartw.p. 94. 



Among the numerous fine things found in Guatemala by 

 Mr. Skinner, there are not many which are more deserving of 

 cultivation than this plant, which has so much the habit of 

 O. Cavendishianum as to seem a mere variety of it, although 

 in reality quite a distinct species. It was also met with by 

 Mr. Hartweg. The flowers are fully two inches in diameter, 

 which is four times the size of O. Cavendishianum; they 

 appear in a dwarf erect raceme, not panicle ; they are of a rich 

 yellow, with the sepals and petals bordered with cinnamon 

 colour ; the labellum has two very small lateral lobes, and for 

 its crest it has a pair of distinct tubercles, the posterior 

 double, the anterior 3-lobed, and the two separated by a con- 

 siderable space. The flowers are moreover slightly scented, 

 which is not the case with O. Cavendishianum. Many plants 

 are doubtless in the country ; but no one has succeeded in 

 flowering them except Mr. Bateman, who sent a fine specimen 

 to a late meeting of the Horticultural Society, 



The figure at the corner of the plate shews the peculiar 

 arrangement of the warts on the crest of the lip. Besides 

 March, 1843. f 



