17. 
17a. 
18. 
18a. 
19. 
19a. 
20. 
20a. 
21. 
21a. 
Ba 
2228. 
£5; 
23548. 
acuminate; stigmata confluent ............. 16. Gularia 
Anther bivalvate, often deeply cordate, emarginate at 
apex, much surpassing the rostellum, during anthesis 
becomes flattened and arcuately curved backwards; stig- 
mata always confluent; rostellum emarginate, hardly dif- 
ferentiated, with a dorsal median toothlet which often is 
very much reduced in size or obscure altogether ........ 
ere eT eT ee Tee eer ee ee 17. Mesadenus 
Anther entire, rather deeply concave to umbonate, as long 
as, or somewhat surpassing rostellum, as a rule never 
curved backwards; stigmata free to approximate or trans- 
versely confluent; rostellum variously developed, always 
SUAS pix vndsn ena een eaaeeee ae howe epee ees 18 
Column ballooned out in front due to inflated clinandrium 
A i nish wins WR ews ne ees BR eee 19 
Column never ballooned out in front ............... 20 
Rostellum short, bilobed; lip sagittate at base; stigmata 
Ca) i168), 0 113! | aaa te an arn ae ae are re 18. Beloglottis 
Rostellum elongate, entire; lip more or less auriculate at 
base; stigmata confluent ................ 19. Physogyne 
Stigmata situated on a deeply cleft, biparted cartilaginous 
plate; rostellum narrowly triangular, dorsal to plate, in 
center behind dividing cleft ............ 20. Thelyschista 
Stigmata always on same plane with rostellum ...... 21 
Rostellum divided into two distinct segments ........ 22 
Rostellum undivided with an entire, pointed, truncate, 
SmaAlcinaie OF CENUCHIAIC ADER. 6 sc.se a hwnd arden 23 
Inflorescence arranged in a single or double spiral; dorsal 
sepal free from column; lateral sepals free; rostellum bifid 
or bidentate with sharply pointed or filiform segments 
eer err Tee re Teer Tere T Terre ere Ce 21. Spiranthes 
Inflorescence quaquaversal or subsecund; dorsal sepal 
halfway adnate to column; lateral sepals connate at base; 
rostellum bilobed with broad, obtuse lobules ........... 
ee ee eee Te eC ee rere ee ree 22. Galeottiella 
Rostellum rigid, more or less cartilaginous........... 24 
Rostellum soft, always pliable, laminar to filiform ... 31 
293 
