46 ZYGOPETALUM. 



darker than the other segments, the crest whitish and the fimbriae 



red-brown. 



Z. Burtii Wallisii, supra, Batemania Burtii Wallisii, Eoezl in Godefroy's 

 Orchidophile, 1883, p. 477. Batemania "Wallisii major, Williams' Orch. Alb. IV. 

 t. 185. 



Originally discovered by Endres in 1867 in Costa Rica, and 

 shortly afterwards imported by us from that country; it flowered 

 for the first time in Great Britain in the collection of the late Mr. 

 Burnley Hume, at Winterton, in Norfolk, in the summer of 1872. 

 The comparatively few plants that have flowered since show that 

 the species is variable in the size and colour of the flowers, but 

 no structural deviations from the first described type have been 

 observed by us. The variety^ a very handsome one, was detected 

 by Wallis, and afterwards by Roezl and other collectors in New 

 Granada, none of whom divulged its precise habitat. Eoezl states 

 that a similar variety is found in Ecuador.* Our engraving repre- 

 sents a Colombian form. 



Zygo]^etalum Burtii, better known as Batemania Burtii, is one of 

 a group of orchids forming the sections Bollea, Huntleya, and 

 Waescewiczella as defined above, that have hitherto proved difiicult 

 to cultivate. The following account of the climate of Costa Rica, 

 the native country of Z. Burtii, Z. cerinum, Z. discolor and others, 

 communicated to the Gardeners^ Chronicle] by Richard Pfau, an 

 orchid collector in Central America, may prove suggestive : — 



" The temperature of Costa Rica is remarkable for its equability, 

 especially for the minima which are reached every day just before 

 sunrise. At my station the maximum was 26° C. (79° F.) by day, 

 and never below 15° C. (60° F.) by night. In the mountain region 

 the temperature is aliout 2° C. less for every 1,000 feet of elevation. 

 The temperature is about the same all through the rainy season, and 

 even in the dry season the difference is only about 1° C. The greatest 

 heat observed in the dry season at an altitude of over 3,000 feet 

 was 30° C. (86° F.) in March, 1881. On the slopes facing the 

 Atlantic it rains every day in the year; on the slopes facing the 

 Pacific there is a dry and a rainy season, the rainy season lasting 

 from May till November, the remaining part of the year being absolutely 

 dry. During the rainy season the atmosphere is saturated with moisture. 

 At other times the north wind dries up everything, but the nights 

 are nevertheless very damp ; the dew is exceedingly heavy at all times 

 of the year." 



* Godefroy's Orchidophile, loc. cit. 

 t Vol. XX. (1883), p. 599, 



