284 METAMORPIIY. 



proper to the corolla is developed in the tube of the 



Fig. 153. Flower of Mimuliis, with petaloid calyx. 



calyx, the edges of the limb remaining green, the middle 

 of the limb being purple {Primnla tricolor) . 



Under this head may be mentioned the occun*ence of 

 tubular sepals in place of the ordinary flat ones in 

 Hellehorus olympicus ; only two of the sepals were thus 

 affected in a specimen recently observed a third ex- 

 hibited an intermediate condition. 



The normal coloration of the calyx occurs most 

 frequently in polysepalous calyces ; teratological 

 coloration, on the other hand, occurs especially in 

 gamosepalous flowers. This assertion is borne out by 

 the frequency of the change in the plants already men- 

 tioned, and also in the following : Campanula persici' 

 folia, Anagallis arvensis. Gloxinia, Syringa ])ersica,^ 

 Calceolaria, ^c. ^c. In the last-named plant one or 

 more of the lobes of the calyx may frequently be seen 

 replaced by a slipper-like petal. 



' Schlechtendal, ' Linna'a,' ix, p. 737. 



