DR. LINDLEY ON WEST AFRICAN TROPICAL ORCHIDS. 181 
pubescentibus, sepalis setaceo-aristatis, labello ovato acuminato mem- 
branaceo nudo utrinque unidentato. 
“Flowers dull purple." Prince's Island. (1984) Barter. 
Very distinct in the long setaceous points of the sepals and the 
thin ovate lip. 
8. P.? ALPINA ; subacaulis, foliis linearibus obtusis emarginatis, pedun- 
culo hispido unifloro, flore glabro longe pileato, sepalis acutis dorsali 
' eoncavo, petalis linearibus acutis, labello longe unguiculato rotundato 
apienlato basi appendice carnoso 6-lobo aucto unguis marginibus in- 
flexis ciliatis. 
* Epiphyte, at 6000 feet, Fernando Po, Dec. 1860.” (647) Mann, 
The pollen of this little plant being unknown, it may be doubted 
whether it belongs to the genus Polystachya, especially since it 
- has not the cushion characteristic of all the other certain species, 
but in its place a remarkably fleshy 6-lobed flat round process. It 
has, however, the habit of Polystachya capensis of Sonder (P. Otto- 
niana, Rchb. f). I have only seen two specimens, each a few 
inches high, bearing one dark-red flower, with similarly red carinate 
bracts. 
9. P. ELASTICA; foliis lineari-lanceolatis apiee obliquis scapo subzequa- 
libus, spatha membranacea convoluta pedunculo breviore, spica sim- 
plici hirta 8-10-flora stricta bracteis cucullatis apieulatis recurvis, 
floribus glaberrimis longe pileatis, sepalis apiculatis, petalis obovatis, 
labello elastice resiliente unguiculato mesochilio rhombeo medio pul- 
vinato epichilio incurvo cochleato ungue lineari carina truncata acuta 
aucto, 
“ Epiphyte. River Bagroo, April 1861.” (902) Mann. 
Only one specimen of this curious plant has come home. It is 
6 inches high, with flowers about 4 inch long, and throws out a 
large mass of the thin flat roots that are so common among the 
leafless Angrecs. Its labellum, which is a long narrow yellow 
body with an inflexed concave terminal lobe, is thrown back with 
force when the flower expands, so as to hang down over the pileus 
formed by the united lateral sepals. By what mechanical con- 
trivance this is effected I have been unable to determine. 
Evrorurn, R. Brown. 
l. E. cuiNEENsrS, Lindl. in Bot. Reg. t. 686. 
“Very ornamental. Flower-stem above 3 ft. high. Sepals chocolate. 
Labellum light red, with darker lines.” Shady rocks; Nupe. (1485) 
Barter. 
Much larger in all its parts than the garden plant. lt is certain 
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