188 KEY TO SUB-CLASSES, ORDERS AND GENERA. 
CXIV—ORCHIDACHK Ai—cont. 
cohering in pairs by a granular viscus; lip Sessile at 
the base of the column, erect and embracizg it with 
concave or saccate base :— .. cemxxv—Celogyne, 
(§§) Flowers from lateral scapes arising from the base of 
pseudobulbs, or from the rhizome between them, solitary 
or in heads, umbels, or racemes; leaf 1 coriaceous, or 2 
chartaceous, usually from the apices of the pseudobulbs 
on a generally prolonged rhizome; pollinia free, or 
oceasionally attached by their bases to a small sphere of 
translucent tissue, inner pair always the smaller :—- 
(||) Lateral sepals markedly exceeding the dorsal; flowers 
umbelled : : at omxxii—Cirrhopetalum, 
(|||) Lateral seual not. oreatly exceeding the dorsal, along- 
side or under the lip; flowers racemose or spicate :-— 
({£) Lip jointed at foot of column, mobile, usually very 
small and strongly recurved; column very short, 
often 2-aristate at the top :—... emxxi—Bulbophyllum, 
(ff) Lip more or less united by a flesny base to edge of 
column and haying more or less a deep passage at 
its base ; column, elongated, hornless, and winged:— 
emxz—Hpidendrum. 
(||| |) Lateral sepals spreading; flowers solitary :— 
cmxxiii—Trias. 
(tt) Stem jointed, composed of elongated pseudobulbs strung 
on a woody core; leaves 1—2 chartaceous; flowers 
terminal racemose ; column very short, hooded or 
winged ; lip sessile on base of column, erect and 
saccate :- 66 S50 4 emxxvi—Pholidota, 
(**) Foot of column O ; stemless, tufted with very stout root 
fibres, and without psendobulb ; leaves radical, very 
coriaceous; flowers very small, in panicled spikes; 
lateral sepals forming a mentum; column narrowly 
winged :— 400 sid sce ... emxxiv(bes.).-- Josephia, 
(B) Poilinia 8, subequal, all cohering, or cohering by fours toa 
common membrane; stems pseudobulbous or not; leaves 
chartacecus, coriaceous, or fleshy; inflorescence lateral or 
terminal, racemose or capitate, column short or long, pro- 
longed below into a foot:— ... ..  Cmxxiv— Eria. 
(2) Pollinia attached singly, in pairs or in fours, through a caudicle 
(rarely 2) to a stigmatic gland :— 
(A) Anther terminal, pollinia 2 :--- 
(a) Stem pseudobulbous, short; leaves few; flowers racemed or 
panicled ; lateral sepals forming a mentum :— 
cmxxvilli—Polystachya, 
(b) Stems not pseudobulbous ; leaves several :- — 
(a) Stems very short or none :— 
(*) Leaves very long, narrow, and coriaceous ; lip not Spurred, 
but sessile at the base of the column, embracing it 
upwards, base concave, side lobes erect; disk with 2 
pubescent median ridges :- : ee cmxxvii—Cymbidium. 
(*#*) Leaves closely clustered, flat, fleshy, and pendulous; lip 
spurred wish “forked appendages on its disk :— 
cmxxi—Doritis. 
(***) Leaves none when flowering; lateral sepals inserted by 
broad base to elongate foot of column ; lip with large 
erect side lobes, midlobe a tomentose pulvinus :— 
emxxxiii—Sarcochilus, 
(8) Stems more or less elongated; leaves coriaceous and flat, 
or fleshy and terete :—- 
(*) Lip not spurred; column short, not winged nor with a 
foot :— 5 
(+) Leaves terete :— Be ie a cmxxix—Luisia, 
(tt) Leaves lorate, recurved : — ie .. Cmxxx—Cottonia, 
