INTRODUCTION. 83 
VI.—ILEVATION ABOVE THE SEA-LEVEL. 
Most of the species are confined either to the mountains, or to the 
‘‘Flats,” as the low, sandy downs of the isthmus are termed; but a 
considerable number nevertheless enjoy a wide range of elevation. 
For convenience they may be broadly divided into three groups, as 
follows :— 
I.—Species which do not ascend the mountains to a greater elevation than 
500 feet. 
Kulophia cochlearis. 
Bartholina pectinata. 
Holothrix Mundtii. 
Satyrium emarcidum, §S. marginatum, §S. Hallackii, S. bracteatum, 
var. lineatum. 
Disa emula, D. barbata, D. venusta, D. lugens, D. cernua, D. 
flexuosa, D. bifida. 
Disperis secunda. 
Corycium bicolorum, C. orobanchoides. 
Pterygodium cruciferum, P. Volucris, P. alatum. 
Total, 20 species. 
II.—Species which do not descend into the plain to a lower elevation than 
500 feet. 
(The numbers indicate the observed height, or, where two numbers 
are given, the range in feet, above the level of the sea, approximately.) 
Eulophia tristis, 1200; EK. tabularis, 1400-23800; E. aculeata, 
1500-8550; KE. ustulata, 1200. 
Holothrix condensata, 2800; H. gracilis (height not recorded) ; 
H. parvifolia, 2400. 
Satyrium rhynchanthum, 1100-3000; §. ochroleucum, 1500; 
S. foliosum, 3300; §S. lupulinum, 500-1200; S. ligulatum, 
2500; §. bicallosum, 600-2500; §. Lindleyanum, 800; 
S. bracteatum var. nanum, 800; §. saxicolum, 1000-2400; 
S. striatum, 1200. 
Disa longicornu, 2100-8000 ; D. maculata, 1200-1600 ; D. uniflora, 
1100-8300; D. ocellata, 3800; D. tenuicornis, 2500; D. tabu- 
laris, 2500-3300; D. obtusa, 800-2400; D. cylindrica, 2400- 
3500; D. lineata, 2700; D. racemosa, 800-2500; D. venosa, 
2400; D. tenuifolia, 800-2500; D. patens, 1100-1300; 
D. Harveiana, 1500-2500; OD. glandulosa, 1600-3000; 
D. vaginata, 1400-2500; D. rosea, 1400-8300; D. Richardiana, 
2500-8400; D. Bodkini, 2300-8000; D. melaleuca, 1300- 
8300; D. atricapilla, 1800; D. fasciata, 1500-2700; D. grami- 
