Tap. 7031. 

 hexisia bidentata. 



Native of the United States of Colombia. 



Nat. Ord. Obchide^:. — Tribe Epidendee^:. 

 Genus Hexisia, Lindl. ; {Benth. et Hook.f. Gen. PL vol. iii. p. 524.) 



Hexista bidentata ; internodiis fusiformibus sulcatis vaginatis, foliis 2 oppositis 

 cmiaceis linearibus apice obtuse 2-dentatis canaliculatis dorso carinatis, racemis 

 breviterpedunci:latis paucifloris basi vaginatis, pedicellis breviusculis,perianthio 

 patente miniato, sepalis ovato-oblongis obtusi?, petalis paullo minoribus, labello 

 sepalis a?quilongo lineari-oblongo obtuso, ungue basi columnar adnatc, columnar 

 auriculis oblongis obtnsis marginibus sinuato-2-dentatis, antbera depresso- 

 hemispberica, polliniis 4 subglobosis gracile stipitatis callo viscoso insertis. 



II. bidentata, L'miU. in Hook. Journ. Bot. vol. i. (1834) p. 8 ; Reiehb.f. in 

 Walp. Ann. vol. vi. p. 170, and in Beitr. Orchid. Centr. Am. p. 58. 



U( xisia, or as it was originally, probably by inadvertence, 

 spelt Hexisea, is a small genus of Mexican, Central American, 

 and tropical South American Orchids, of which one species 

 only had previously been figured, the IT. imbricata, Reichb. 

 f. (as Diotlwncra imbricata) in Lindley's " Sertum Or- 

 chidearum," t. 40, f . 1 ; a native of Roraima in Guiana. 

 The genus was first described as having a closed perianth; 

 an error corrected in the " Genera Plantarum," where, 

 however, the lip is described as erect, which is not the case 

 in the specimen here figured. 



//. bidentata was discovered by Cuming in "Western 

 Colombia and Panama, and subsequently found by CErsted 

 in Nicaragua. The plant here figured was procured for 

 F. A. Phifbrick, Esq., Q.C., in 1887, and flowered in the 

 Royal Gardens in June of the present year. 



Desck. Stem tufted, six to eight inches high, stout, 

 branched, formed of fusiform many-grooved internodes one 

 to two inches long, clothed when young with appressed 

 subacute sheaths. Leaves in pairs in the terminal inter- 

 nodes, coriaceous, two to four inches long by a quarter 

 of an inch broad, spreading, linear, obtusely two-fid at the 

 apex, channelled above, keeled beneath, dark green. 



DECEMBER 1ST, 1888. 



