ODONTOGLOSSUM citrSsmum. 

 Lemon-scented Odontoglossum. 



GYNANDRIA MONANDRIA. 



Nat. ord. ORCHiDACEiE § Vande^. 

 ODONTOGLOSSUM. Kunth. 



0. citrosmum (Lincll. Bot. Reg. 1842. misc. 68.) ; pseudobulbis subrotundis 

 compressis Isevibus monophyllis, folio oblongo-ligulato obtuso racemo 

 paulo breviore, sepalis oblongis obtusis petalisque conformibus subse- 

 qiialibus, labello unguiculato reniformi basi bituberculato, columnse alis 

 lateralibus subtruncatis dorsaliq. rotundato denticulatis. 



Although such plants as this seem as if they weakened the 

 genus Odontoglossum, on account of their similarity in habit 

 to Oncidium, yet in truth they rather confirm that genus by 

 showing that although the appearance of Oncidium may be 

 assumed, yet the main points of structure remain unaffected. 

 One of the most important of these points is the partial paral- 

 lelism of the base of the labellum with the column, and the 

 presence of a pair of parallel raised plates at that part. This 

 occurs in the original Odontoglossum, and runs through 

 all the numerous species published and unpublished with 

 which I am acquainted ; and it does not occur in any Onci- 

 dium. 



While however, notwithstanding its habit, this Odonto- 

 glossum citrosmum confirms, rather than diminishes, the pro- 

 priety of separating Odontoglossum from Oncidium ; it has a 

 peculiarity of its own, which may possibly suggest to some 

 minds the propriety of forming it and such plants as 0. brevi- 

 folium and pulchelium into a separate genus, characterized by 

 the presence of a toothed wing or membrane at the back of 

 the anther ; and the similarity of these plants in habit might 

 seem to justify the measure. In that case the generic name 

 of Trymenium might be taken for them. I do not however 



