COLORATION. 



11 



whole lip downwards, and at tt 



same 



m 



towards th 



and therefore most 



d 



sily displaced, lateral lobe lie 



a. 



Tl 



e on which the overlapping 



us 



bein 



the thrust of the beak is downwards and toward 





lly the left 



de 



e 



qual 



d 



pposite counter-thrust upwards and to th 



the left. But there is thus an 



upon the hood 



right 



acting 



And since the basal portion of the hood is of a more delicate texture than either 



the hood proper or the lip, the chief result is a certain 



ght at that 



not the 



nly 



d 



as the point of least resista 



deed can 



But although 



ount of twisting to the 



this is one, it is 



Other notable means 



cely be the usual, explauat 



I 



P 



of attaining th 



of dextrorse twisting 



yalantha the lateral lobe of the lip 



same result occur among the SlPBOMAMfLi 



pped by the other 



^ r 



w rows more 

 ly. 1 This prevents the growth of the hood in an erect position. Being thus deflected 



in the unexpanded flo 



the hood retains this attitude 



the flower opens 



Soi 



ne 



times the apex of the beak remains permanently entangled in this dwarfed lateral lobe 



The apex of the beak also becomes 

 of the margin and of the rest of the 



ted from the lip by tl 



jual development 



ood 



Not infrequently (P. Elwcsii) the margin 



grows most rapidly, and thus, by throwing back the dorsum of the hood, at the 



same 



tilt; 

 the 



th 



apex of the beak up 



ds 



d away from th 



lip 



M 



remarkabl 



gement that occurs in P. bicornuta. Here the growth of tho margin of 



still 

 e h 



is 



OOl 



I 



IS 



rested while that of the rest proceed 



The 



r 



ult is 



tly what is seen when 



the string that closes the mouth of a canvas money-bag is tightened 



The b 



f 



the hood, especially in the vicinity of the margin, is 



tl 



into many pi 



folds, and these now deflect, now reverse, now invert 



the 



pper portion 



in 



portion 



its and 



ry case 



removing the tip of the beak, and with it the stigma, from the neighbourhood of 



(p 



The colour of the corolla varies from a pale or rose pink ( l\ furfuracea) to dark purpl 

 Integrifolia) ; or from green (P. fragilis), or dirty white (P. pyenantha), to yellow (1 



ra). Stated in the most srenera! terms, th 



Scully ana) ; a few species are pure white (P. albijl 

 colour is either some shade of red or some shade of yellow, corollas of both types givin 

 either as sports or permanently, to white. At the same time a species may be red 

 locality and yellow in 



another (P. myriophylla, megalantha, altaica), but this is not very usual 



Red 



is slightly the more common of 



tl 



two, 151 of the sp 



> 



57*8 per cent, of 



the whole, being of this colour 



There is, besides, a marked association of red colour with 



the character of opposite leaves, and an equally marked association with the presence of 



r, probably indirect, and depend 



) exhibits the facts of the case 



a 



beak 



These 



elations with 



structure are, howe 



rather on geographical distribution 



The 



b joined tabl 



more compactly (the colour of four species b 



doubtf 



T 



III 



Relation of Colour of Corolla to Struct™ 



Colour of Corolla. 



Pink, red, or purple. 



Green, yellow, white, or doubtful 



A.— Irrespective of structural characters 



B. — In species with 



1 Alternate leaves 

 2. Opposite 



C. — In species with 



1. Beaked corolla 



• • • 



)9 



t • • 



#•• 



151 





88 

 63 



2. Beakless 



93 



58 



57-87, 



52 

 70 



70 

 45 



J) 



• * * 



110 



83 



27 



39 

 71 



42 -2% 



48 

 30 



30 

 55 7. 



This condition has also been noticed by 



Maximowicz (Mel 



of the lip itself. 



Ann. Roy. Bot. Gard. Calcutta, Vol. HI. 



