22 MALAXIDE. PLEUROTHALLEZ. 
XIV. DIENIA. 
Dienia, Lindley in Bot. Reg. 825. Pedilea, Lindl. in Hook. Fl. 115. in notis, 
Orch. scel. no. 144. c. ic. 
Sepala patentia, libera; lateralia basi æqualia ssepius breviora. Petala 
filiformia patentia. Labellum erectum, basi cum columna accretum, 
etuberculatum, nune concavum membranaceum acute trilobum, nunc 
excavatum margine callosum apice trilobum, v. integrum. Columna 
elongata, semiteres, recta, clavata, cum labello concavo minutissima. 
Anthera bilocularis. Pollinia 4, collateralia (00 o0).— Herbae terrestres, 
foliis basi parum incrassatis, membranaceis, plicatis. Scapus teres v. 
saltem apterus. Flores parvi, herbacei v. fusci, racemosi, v. spicati, ter- 
minales, angulis fructus sæpè crispis. 
This genus differs from Liparis chiefly in the shortness and straightness 
of the column connected with a three lobed concave erect or excavated 
lip, which is scarcely recurved about the middle, and which has never any 
tubercles at its base. The column of Liparis is always arcuate. From 
Microstylis, with which it agrees in the shortness of the column, it 
is distinguished by its lip being parallel with the column, not at right 
angles with it, and neither sagittate nor cordate at the base. 
1. Dexia congesta. Lindley in Wall. Cat. no. 1936. 
D. caule folioso, foliis oblongo-lanceolatis acuminatis plicatis, spicà dens4 
cylindraceà, perianthii laciniis secundis, labello oblongo excavato apice 
calloso tridentato : dentibus obtusis intermedio ovato. 
Malaxis latifolia. Smith! in Rees. 
Dienia congesta. Lindl. in Bot. Reg. 825. 
Hab. in Napalia, Wallich ; in Chind, Reeves. (hab. s. sp. e Museo Anglo- Indico ; 
v. ic. pict. sinens. in Bibl. Hort. Soc.) : f 
Planta terrestris pedalis v. ultra. Scapus apice spicatus, floribus luteo 
viridibus, minutis, densis, in cylindrum collectis. Sepala lineari-lance- 
olata obtusa ; lateralibus a labello recurvis. Petala filiformia patentia. 
Labellum cum columna parallelum, excavatum, cucullatum, apice cal- 
losum tridentatum, dentibus obtusis, intermedio ovato. Columna semi- 
teres excavationis labelli longitudine, apice bialata. Ovarium et capsula 
angulis membranaceis undulatis. 
2, Dexia fusca. 
D. caule folioso, foliis oblongo-lanceolatis petiolatis acuminatis plicatis, 
spicà densà ovatà cylindraceà, perianthii laciniis secundis, labello sub- 
rotundo excavato apice calloso tridentato vix cucullato: dentibus obtusis 
intermedio conico. 
Hab. in Zeylona in montibus, Macrae (hab. s. sp. et v. ic. pict.) 
Priori valde affinis. Flores fusco-purpurei. 
3. Dixa cylindrostachya. Lindl. l. c. no. 1934. 
D. caule unifolio, folio ovato obtuso, spicá dens& cylindraceá, perianthio 
explanato, labello excavato apice calloso subintegro, columná brevissim4. 
Hab. in Napalia, Wallich. (hab. s. sp. e Museo Anglo-Indico.) 
Planta habitu Microstylis monophylle sed floribus densioribus distinguenda 
Palmaris v. sesquipedalis. Perianthium explanatum. Sepala ovata 
