24. 
24a. 
2. 
25a. 
26. 
26a. 
og 
27a. 
28. 
28a. 
29. 
29a. 
Rostellum broadly triangular, acute at the more or less 
obscurely 3-lobulate or 3-dentate apex .............000- 
MAAN RAMS ARS RES EVE RK RRR ROD 23. Odontorrhynchus 
Rostellum linear-lanceolate to almost acicular, sharply- 
pointed or with a small, lateral tooth at base on each 
5 (| i a re ere rere ee ee re ee Tere a eer eee Pie) 
Column footless, at most with an oblique base on top of 
0) 5 Se ee eer eee ee re ne ery San re err eee 26 
Column with a distinct, decurrent foot on side of ovary 
OPT PET eee rer eT Creer ee eer Trot pre 29 
Flowers basally enlarged, urnlike; sepals at base on both 
sides become separated and form an opening like small 
windows; lateral sepals adnate to claw of lip and together 
display a prominent mentum ....... 24. Dithyridanthus 
Flowers neither enlarged basally, nor do sepals form win- 
dows; mentum at best rudimentary, obscure ......... 27 
Column footless, its base arcuately confluent with claw of 
lip which is without any calli or marginal thickenings; lip 
segmented into a short, cup-shaped hypochile and an 
elongte, conduplicate, apically recurved epichile ........ 
eT ee er ere ree Tee rey 25. Cotylolabium 
Column with a distinct, oblique base on top of ovary, 
sharply parallel with calliferous base of lip; lip not seg- 
GUC ncaa cec sereapecea eens ti easnew sed eeerankes 28 
Inflorescence subcorymbose, cernuous; lip unguiculate 
with large, thickened auricles; column elongate, slender 
hii aehaG ROLE R RRR REWER EAR as eS 26. Coccineorchis 
Inflorescence spicate, erect; lip sessile, calliferous along 
margins at base; column short, stout ................... 
Ee eT ee ee ere eC eee rere 27. Stenorrhynchos 
Plants miniature with few-flowered inflorescences; facul- 
tative epiphytes; rostellum unequally 3-dentate, the median 
tooth always longer; lip broadly concave to gibbose at base 
eT ToT eT eee TT Or re Tee Tere 28. Lankesterella 
Plants large with an elongate, cylindrical, many-flowered 
inflorescence; facultative geophytes; rostellum entire or 
obscurely 3-dentate, always linear; lip sagittate or con- 
CeCAte BT OARS 6 cc vexerijaeaxriesoneseneneees 30 
