203 



Callous part greatly exceeding 



the membranous 



(hj Lateral sepals free. 



Flowers over 9 lines 



Flowers under 9 lines. 



Supplementary process be- 

 tween basal lobe and 

 anterior part of lateral 



appendage 



Supplementary process absent 



B. Lateral index over 80, but not 



exceeding 90 



C. Lateral index over 70, but not 



exceeding 90 



(a) Lateral sepals connate, or 

 partly so. 



Labellum with marked con- 

 striction at anterior third. 



Labellum on rather long 

 claw ; flowers large and 

 yellowish-green 



Labellum sessile ; flowers 

 medium size and prune- 

 coloLired 



Labellum without marked 

 constriction, sessile. Flow- 

 ers small (under 6 lines). 



yellowish-green 



(i) Lateral sepals free 



D. Lateral index over 60, but not ex- 



ceeding 70. 



(a) Basal lobe of lateral appendage 

 relatively large; labellum 

 relatively narrow: flowers 

 yellowish-green, without char- 

 acteristic odour 



(h ) Basal lobe only about i total 

 height of appendage : labellum 

 relatively wifle ; flowers prune- 

 coloured, with powerful mag- 

 nolia odour 



P. rlatinn 4 

 P. odovatiim 5 



P. rot}i.ndifloriim 6 

 P. album 7 



P. pruinosum 8 



P. gracile 9 



P. con strict }im 10 



7^. orcidrntnle 11 

 P. patens 12 



P. f >i sen m 13 



P. Fitzgeraldi 14 



The following table indicates the approximate length of 

 the flowei- (including ovary without pedicel) : — 



Lines. 

 P. elatuvi 10 



P. odovatiim 



P. Australe 



P. grade 



P. patens 



P. alhiim 



P. pruinosicm. 



P. constrirtiim 



P. Fitzgeraldi 



P. rotitndiflorum 



P. fuscvm 



P. orridentale 



P. nigricans 



P. Tepperi 



.. 10 

 .. 9 

 .. 9 



7 



7 



7 



.. 7 



.. 6i 



■ ? 



5 



.. 5 

 2— 2i 

 U— 2' 



