ON ORCHIDS. 



617 



Schroeder's collection), O. Rossii, and O. triumphans. There are 

 other interesting kinds, but the above are the most robust- 

 growing and suitable for beginners. ' 



Oncidium. — Several of these succeed better grown with the 

 Odontoglossums than under warmer conditions, and should be 

 treated in the same manner in every respect. They include such 

 lovely sorts as O. concolor, O. cucullatum, O. incurvum, the lovely 

 forms of the O. macranthum section, with their trailing spikes of 

 exquisitely beautiful flowers, O. ornithorhynchum, O. tigrinum, 

 and several others with lesser attractions. As the above flower 



Fig. 398. — Odontoglossum excellans. 



at different seasons of the year, they help to keep a succession of 

 blossom in this department. 



Sophronitis is one of the most beautiful genera of winter- 

 flowering Orchids. S. grandiflora (Fig. 400) possesses the highest 

 qualities of all the species in cultivation, its deep scarlet flowers 

 always compelling admiration. The plants are of dwarf habit, 

 and suitable for pan or basket culture, suspended from the roof. 

 The potting compost used should be the same as that 

 recommended for Cattleyas. 5. grandiflora does well in a light 

 position of the cool house with the Odontoglossums. The other 

 species of this genus are scarcely worthy of consideration where 

 space is limited. They require similar treatment to S. grandiflora. 



Hardy Orchids. 



Several species of Orchids form interesting subjects for the 

 rock garden. The species and varieties most suitable for this 



