LIST OF COOL ORCHIDS. 113 



O.rosenm (Lindley, Loxa). This is but little known at pre- 

 sent, although one of the oldest and prettiest of the entire 

 group. Messrs. Backhouse and Sons, of York, have been 

 fortunate enough to introduce it within the last few years. 

 Pseudo-bulbs ovoid, two-leaved ; leaves ob-lanceolate, about a 

 foot long ; spike arched or drooping, from ten to twenty- 

 flowered ; fiowers about an inch across, and of a uniform deep 

 rosy-crimson colour, the apex of the column only being white. 

 It is very distinct, and should be more cultivated, on account 

 of its colour. Flowers in April, lasting a month. 



0. Rossii. A beautiful Mexican species, of: dwarf habit. 

 Pseudo-bulbs angular, rather larger than those of 0. citros- 

 mum, which it resembles in habit ; scapes from one to three- 

 flowered ; flowers from one to two inches across ; sepals 

 lanceolate, about an inch long, white, barred with brown trans- 

 versely ; petals sub-hastate, much broader than the sepals, pure 

 white, with a few spots at their bases only ; lip oblong or cor- 

 date, pure white, with a lemon-yellow bilobed crest ; column 

 white. A delicate, free-flowering plant, blooming during the 

 winter, and lasting from three to four weeks. It is a native of 

 Mexico. 



a. 0. Rossii superbum. This select variety is a better form, 

 having larger flowers than the typical species. Its flowers are 

 from two to three inches across, barred with crimson, very 

 distinct and effective. 



b. O.Rossii Warnerianum. This is another fine form, having 

 pseudo-bulbs two inches high ; flowers from three to five, on a 

 scape longer than the leaves, two to three inches across, with 

 broad segments ; sepals and petals pure white, barred and 

 blotched with purple at the base ; lip cordate, crenate, white, 

 with a golden crest. 



*0. Sclilieperianum (New Granada). In habit this resem- 

 bles 0. grande ; but it flowers in June and July, lasting a long 



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