108 COOL ORCHID GROWING. 



0. luteo purpureum (New Granada altitude 8,000 to 9,000 

 feet). This is a very variable species, of which 0. Hallii, O. 

 hystrix, and 0. radiatnm are the most characteristic forms, 

 these, again, becoming merged into the normal type through 

 a long series of but slightly different intermediate sub- varie- 

 ties. It is a question whether even the grand O. triumphans 

 is not an extreme and superlatively beautiful form of this 

 errant species ; pseudo-bulbs conical, slightly compressed, 

 two-leaved ; leaves ob -lanceolate, often of a bronzy colour ; 

 flower-spikes from one to three feet long, sometimes branched; 

 individual flowers from two to four inches across ; sepals and 

 petals lanceolate, acuminate, golden yellow, heavily blotched 

 with brown ; lip white, spotted with brown, having its 

 margin serrate, and a radiate golden crest. 



a. 0. luteo purpureum Hallii. One of the finest forms, 

 having flowers from three to four inches across ; sepals and 

 petals crimson brown, tipped and margined with bright golden 

 yellow ; lip an inch broad, serrate, white, spotted with crimson ; 

 crest radiate, golden, column white, streaked with brown ; the 

 sepals and petals are green behind, streaked with brown. A 

 splendid specimen of this variety bore four flower-spikes in 

 the collection of E. Salt, Esq. One of the spikes was from 

 three to four feet long, branched, and bore thirty flowers ; it 

 makes a fine plant for exhibition. 



0. luteo purpureum hystrix. This variety is only a selected 

 garden form, and varies from the normal type in colour only. 

 0. luteo purpureum grande and 0. radiatum are also varieties 

 of this species, distinguishable only by the size and colour of 

 their flowers. 



0. maculatum (Mexico, 1838). The habit o( this plant is 

 very similar to that of O. cordatum, but the flowers are very 

 distinct ; sepals lanceolate, yellow, barred with brown ; petals 

 much broader, clear golden yellow, with two or three brown 



