50 



ORCHIDACEAE. 



Lip enclosing the column; blade not 3-lobed 

 at the apex : flowers nodding : seed covered 

 with a crust: high-climbing vines. 

 Anther as long as the rostellum or rarely with a 



long beak and exceeding the rostellum. 

 Leaves fleshy ; blades net-veined, seldom paral- 

 lel-veined, not plaited : inflorescence 

 simple. 



Polllnla not in distinct masses : lip with- 

 out a long sac-like spur. 

 Lip turned outward. 



Lateral sepals united at the base 

 and prolonged into a long spur. 

 Lip greatly prolonged at the 

 base, the claw enclosed In the 

 slender sepal-spur : medium 

 sepal much longer than the 

 petals. 



Lip not greatly prolonged at the 

 base, the claw not enclosed 

 in the stout sepal-spur : me- 

 dian sepal not much longer 

 than the petals. 

 Lateral sepals free. 



Lip merely adherent to the 

 column or free and not em- 

 bracing It: stigma 2-cleft. 

 Lip adnate to the column and 

 embracing it : stigma entire. 

 Lip turned upward. 



Lip and petals free, or adnate only 



to the base of the column. 



Sepals free : petals not dilated 



above; lip narrow. 

 Sepals united at the base : petals 



dilated above : Up broad. 

 Lip and petals with claws wholly 



adnate to the column. 

 Polllnla In several distinct masses : Up 

 with an extended sac between the lat- 

 eral sepals : column short. 

 Leaves firm ; blades plaited : inflorescence 



branched. 



Leaves duplicate in the bad. 

 Leaves not plaited. 



Leaves commonly not articulated: polllnla tin- 



appendaged : Up not bennln! 

 Leaves commonly articulated to the petioles 

 or sheathing bases : polllnla with tails 

 or stipes. 

 Column with a distinct foot : Up about as 



large as the sepals. 

 Column without foot: Up larger than 



the sepals. 



Column wholly adnate to the Up: plants 

 without pceudobnlbs at the base 

 of the leafy flowering stems. 

 Lip and column with short stout 

 adnnte bases : flowers axillary to 

 spathe-llke or ncale-llke bracts 

 borne along a rachls terminating 

 the leafy stems and branches. 

 Lip and column with elongate, often 

 lender, adnate bases : flowers In 

 an open or congested panicle or 

 raceme which terminates the 

 leafy stem. 



Column partly adnate to the lip: plants 

 with DMUdobulbs at the base of 

 the naked or scaly flowering utems. 

 Lip 3 lobed. shallowly or deeply so, 

 longitudinally crested or ap- 

 pendaged: sepals and petals 

 relatively short, not attenuate. 



5. VANILLA. 



6. PELEXIA. 



7. 8TENORHYNCHU8. 



8. IBID1CM. 



9. BCADLEA. 



10. CBANICHIS. 



11. PEEBCOTTIA. 



12. PoxTinrv.v. 



13. PHTSCICS. 



14. TROPIDIA. 



15. MALAXIR. 



!. POLTBTACHYA. 



IT. Sl'ATIIK.I.I 





