20 



C. H. OSTENFELD 



Other colour variations also occur, as the blue colour may range 

 from pale blue until a very dark blue; but pale forms are compara- 

 tively rare. 



Both in blue-flowered and in white-flowered plants the inner 

 side of the corolla sometimes has a distinct venation in this manner, 

 that there is a dark ring-line near the bottom of the corolla and 



Kig. 2. a. Hermaphrodite flower; /), »intermediate» flower; c, female flower (b and 

 c from tlie same inflorescence), ('-/i nat. size). 



from there a fair number of veins radiate one third or halfway up 

 on the corolla. This venation (see Fig. 2), which is more easily 

 seen in the white-flowered plant than in the blue-flowered one, 

 is a special character which is present or not without any relation 

 to the colour of the corolla. 



In the normal hermaphrodite plant the corolla is large and its 



Fi|4. 3. «, Hermaphrodite flower; b and c, abnormal female flower; all three from 

 the micropetalous type. (*/i nat. size). 



lobes are broad and obtuse (Fig. 2 a), in the female plant the 

 corolla is smaller (Figs. 2 b and c), but otherwise of the same shape. 

 A very striking form has a minute corolla with narrow and 

 acute lobes, nearly split to the ground. In this micropetalous form 

 the corolla lobes are often not much longer than the sepals and very 

 inconspicuous (see Figs. 3 a~c). The length of the lobes is, 



