44 ZYGOPETALUM. 



that it was found by his collector Libon in 1847 on the peak of 

 Itabira in the province of Minas Geraes in Brazil. It is very near 

 Zygopetalum Mackayi, differing from it chiefly in its much longer 

 and narrower leaves; in its smaller and less fleshy flowers that are 

 difierently coloured ; in its diSerently-shaped lip and narrower crest 

 that is not excavated in front. We are indebted to Sir Trevor 

 Lawrence, Bart,, for materials for description. 



Z. Burkei. 



Pseudo-bulbs sub-tetragonal, compressed, 2 — 4 inches long, di-triphyllous. 

 Leaves linear-oblanceolate, acute, conduplicate at base, 9 — 12 inches 

 long. Scapes stoutish, erect, longer than the leaves, about five-flowered ; 

 bracts cymbiform, about half as long as the pedicel and ovary. Flowers 

 2 J inches in diameter; sepals and petals similar and sub-equal, oval- 

 oblong with reflexed margins, the lateral sepals more acute thau the 

 dorsal one, green, with 7 — 9 chocolate longitudinal lines which are 

 sometimes broken up into dots and become more or less diff'used towards 

 the apex of the segments ; lip broadly clawed with a small auricle on 

 each side of the crest, and expanding into a sub-orbicular, undulate, 

 milk-white blade, irregularly dentate at the margin ; crest fleshy, semi- 

 circular in front, Avith about thirteen violet-purple ribs. Column very 

 thick, terete, pale yellow with some purple streaks above, streaked 

 longitudinally with purple below the stigma ; the apical wings very 

 narrow and toothed. 



Zygopetalum Burkei, Kchb. in Gard. Chron. XX. (1883), p. 684. Williams' Orch. 

 Alb. t. 142. 



A very handsome species belonging to the section Euzygopetalum 

 of Bentham, introduced by us in 4881 from the Roraima in British 

 Guiana through our collector, David Burke, after whom it is named, 

 and who found it growing on rocks at about 6,000 feet elevation 

 in the swamps in which Gypripedium Lindleyanum and Heliamphora 

 nutans have their home; it is still very rare in European collections. 

 The contrast between the pure white blade of the labellum and the 

 green sepals and petals formally streaked with red-brown is very 

 striking. 



Z. Burtii. 



Pseudo-bulbs none. Leaves radical, narrowly elliptic-oblong, acute, 

 10 — 15 inches long. Peduncles stoutish with a sheathing, acute, 

 greenish bract at each jouit, one - flowered. Flowers 3 — 4 inches in 

 diameter, all the segments more or less fleshy ; sepals and petals sub- 

 equal, ovate-oblong, acute, white at the very base, then yellow, the 



