159. ORCHID AC E.E. 



ris. ni.s. Sep. cohering and with large sac- 

 cate nientum. Cohimn short stout. 

 Anthers 2-celIed . . . . .13. 



Fls. rather small. Scape lateral, appearing 

 before the leaves. Lat. sep. adnate to base 

 of slender column. Anthers 4-celled . . ll. 



h. Pollinia 2 or 4 attached to a gland of the ros- 

 telhim which is carried away with them 

 when they are removed. Scape leafless. 

 Underground stem a chain of tubers : — 

 Lip cymbiform, margins involute . . 15. 



Lip with saccate or shortly spurred base, 

 lateral lobes erect embracing the column 



or 16. 



B. Epiphytic orchids. Inflorescence never terminat- 

 ing sympodially connected shoots* (vegetative 

 shoots often sympodially connected). Leaves 

 never plicate (genera 17 to end) : — 



1. Foliage shoots of limited apical growth, their 



basal parts forming a sympodium (rhizome), 

 their upper parts free and usually swollen into 

 pseudobulbs. Pollinia 4 or 8 not attached to 

 a gland or process of the rostellum : — 



a. Upper parts of each annual shoot with several 



nodes (hence ringed, jointed or scarred after 

 fall of leaves). Stems elongate and pseudo- 

 bulbous : — 



Fls. usually large and bright-coloured, not 

 woolly. Pollinia 4 . . . . .17. 



Fls. not large or bright-cold., often woolly. 

 Pollinia 8 18. 



b. Upper pait of each annual hmb of the sym- 



podium with only one node (pseudobulb not 



ringed). Pollinia. 4 : — 

 Sepals subequal . . . . .19. 



Lateral sepals very long and exceeding the 



median . . . . . . .20. 



2. Foliage shoots of unlimited apical growth, mono- 



podial, not pseudobulbous. Leaves strap- 

 shaped or linear, articulate on the sheath. 

 Inflorescence lateral, usually many-fld. Gland 

 or process of rostellum carried away with the 

 pohinia : — 



a. Lip not spurred : — 



i. Column without a foot (or foot very short 

 in Vunda) : — 

 L. terete. Column winged . . .21. 



L. thick linear. Column short stout. Lip 

 saccate at base ..... 22. 

 ii. Column with a foot, lateral sepals forming 



a mentum with it, column winged . 23. 



b. Lip spurred or prominently saccate (see also 



22):— 

 i. Lip saccate or spurred at the base : — 



Spur with longitudinal septum. Fls. small 24. 

 Spur with a transverse lamella or callus. 



Fls. small 25. 



Spur not divided. Fls. small, stipes of 



pollinia slender . . . . .26. 



Spur not divided. Fls. usually large. 

 Stipes of pollinia broad . . .27. 



ii. Lip with an ascending or recurved hollow 



spur under the blade . . . .28. 



Aca ntheph ipp i u in . 

 Pachystoina. 



Geodorum. 

 Eulophia. 



Dendrobimn. 

 Eria. 



Bulbophylhun. 

 Cirrhopetalum. 



Luisia. 



Rhynchostylis. 



Doritis. 



Sarcanthiis. 



Cleisostoma. 



Saccolabium. 



Vanda. 



Aerides. 



* Often from the uppermost leaf axils or nodes of aerial shoots which have 

 lost their leaves. Apparently terminal in Dendrobium, spp. 1-3. 



1152 



