50 



ORCHIDACEAE. 



6. Pelexia. 



7. STENOKRHTNCHtlS. 



Lip enclosing the column ; blade not 3-lobed 

 at the apex : flowers nodding : seed covered 

 with a crust : high-climbing vines. 5. Vanilla. 



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. 

 Pollinia not in distinct masses : lip with- 

 out a long sac-like spur. 

 Lip turned outv.'ard. 



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. 8. Ibididm. 

 Lip adnate to the column and 



embracing it : stigma entire. 9. Beadlea. 

 Lip turned upward. 



Lip and petals free, or adnate only 



to the base of the column. 



Sepals free : petals not dilated 



above; lip narrow. 10. Cranichis. 



Sepals united at the base : petals 



dilated above: lip broad. 11. Peescottia. 



Lip and petals with claws wholly 



adnate to the column. 12. Ponthieva. 



Pollinia in several distinct masses : lip 

 with an extended sac between the lat- 

 eral sepals : column short. 13. Physurus. 

 Leaves firm ; blades plaited : inflorescence 



branched. H- Tropidia. 



Leaves duplicate in the bud. 

 Leaves not plaited. 



Leaves commonly not articulated: pollinia un- 



appendaged : lip not bearded. 15. Malaxis. 



Leaves commonly articulated to the petioles 

 or sheathing bases : pollinia with tails 

 or stipes. 

 Column with a distinct foot : lip about as 



large as the sepals. IC. Polystachya. 



Column without a foot : lip larger than 



the sepals. 



Column wholly adnate to the lip : plants 



without pseudobulhs at the base 



of the leafy flowering stems. 



Lip and column with short stout 



adnate bases : flowers axillary to 



spathe-like or scale-like bracts 



borne along a rachis terminating 



the leafy stems and branches. 17. Spathiger. 



Lip and column with elongate, often 



slender, adnate bases : flowers in 



an open or congested panicle or 



raceme which terminates the 



leafy stem. 18. Auliza. 



Column partly adnate to the lip : plants 



with pseudobulhs at the base of 



the naked or scaly flowering stems. 



Lip 3-lobed, shallowly or deeply so, 



longitudinally crested or ap- 



pendaged : sepals and petals 



relatively short, not attenuate. 



