dd. 
Lip S-lobed as¢syasiaan 15. S. aprica alliance 
Callus of lip with a longitudinal, central groove 
. Callus of lip with a longitudinal, rather obscure 
ridge in center ..... 16. S. gutturosa alliance 
Secondary stems caespitose, densely approximate 
seek vad enna wena 17. S. oblonga alliance 
Secondary stems produced on a rhizome....d 
Secondary stems approximate on an ascending 
WUIZOMIG.. 2594046444444 18. S. pusilla alliance 
Secondary stems remote on a horizontal rhizome 
Oe re re re 19. S. scansor alliance 
3a. Flower bilabiate; lateral sepals for the most part connate, 
but in nature usually connivent to a bifid apex 
id eee pa os Ed Raa eT ee es SUBGENUS STELIS 
Plage CACSDUGSE 4c gx dk teed ewennnnene b 
Plants rhizomatous 20. S. tenuicaulis alliance 
Petals rather thin, cuneate flabellate, longer than 
WIGS. aby evues caeus 21. S. globiflora alliance 
Petals fleshy, transverse, always wider than long 
LiREReeeeeee pewees 22. S. purpurea alliance 
c. Flowers rather large; dorsal sepal 6-12 mm. 
ONE cave evene 22a. S. purpurea group 
cc. Flowers rather small; dorsal sepal 2~4(5) 
WA, ORS cceaeks 22b. S. aviceps group 
INFRAGENERIC CATEGORIES 
Subgenus Nexipous Garay, swhgen. nov. 
Typus: Stelis nexipous Garay 
Flores flabellatae, i.e. sepala lateralia inter se fere usque ad 
basem libera, sed cum sepalo postico alte connata, synsepalum, 
3-lobum formantia. 
Subgenus Dialissa (Lindl.) Garay in Can. Journ. Bot. 34: 351, 
1956. 
Basionym: Genus Dialissa Lindl. in Ann. Mag. Nat. Hist. 15: 
107, 1845. 
Syn.: Stelis Sect. Dialissa (Lindl.) Lindl., Folia Orch. Stelis 2, 
1858. 
178 
