418 Key to the System of 



Calyx-lobes obtuse. 



Often dwarf ; basal leaves small, few, on a shoot distinct 

 from the flowering stem and usually appearing at a 

 different time, rhomboid-ovate ; upper leaves about four, 

 very small, almost bract-like, nearly lanceolar, approxi- 

 mated at the lower half of the stem ; flowers small, from 

 two to several, exceptionally one only, anteriorely often 

 somewhat tinged with red ; lower calyx-lobes transparent 

 and almost colorless, connate to near the summit ; 

 gynostemium suddenly dilated near the summit and 

 bearing two minute linear erect segments ; fruit some- 

 what turgid. Perhaps variety of the preceding. 



P. aphylla. 



1803. Basal leaves absent or early perishing ... ... 1804 



Basal leaves always present ... ... ... ... 1805 



1804. Upper calyx-lobe lined with narrow streaks. 



Often rather tall ; stem-leaves several, from lanceolar to 

 broad-linear, sessile, somewhat clasping, those towards 

 the middle of the stem the largest ; the basal leaves 

 stalked, much shorter and broader, but early fugacious ; 

 flowers rather small, several or many in the raceme or 

 occasionally few only ; bracts very conspicuous, the lower 

 leaf -like ; lower calyx-lobes connate to beyond the middle, 

 pendent ; labellum rough, bidenticulated or truncate- 

 blunt, anteriorely turgid near the base ; gynostemium 

 suddenly dilated upwards, somewhat fringed ; stigma 

 distant from the anther ; fruit ovate -ellipsoid. 



F. longlfolia. 



Upper calyx-lobe banded with broad streaks. 



Rather robust, often dwarf ; stem -leaves several, mostly 

 narrow-lanceolar, sessile, somewhat clasping, those towards 

 the middle of the stem the largest ; bracts leaf -like ; flowers 

 rather large, almost axillary, somewhat reddish-banded, 

 few or several in the raceme, very seldom reduced to one, 

 provided with an extremely thin vestiture ; upper calyx- 

 lobe very bulging, its streaks dull-purplish ; lower calyx- 

 lobes connate to near the summit, pendent, brownish-red ; 

 labellum slightly fringed, truncate-blunt, emitting ante- 

 riorely from the base a semilanceolar minute appendage ; 

 gynostemium gradually expanded towards the middle, its 

 terminal appendages quadrate and downward narrowly 

 lobed ; fruit ovate-ellipsoid. P. vittata. 



1805. Flowers usually large, the calyx-lobes pointed. 



Hardly ever tall ; basal leaves from ovate- to elliptic- 

 laiiceolar, crowded; stem-leaves two or generally more, 



