284. METAMORPHY. 
proper to the corolla is developed in the tube of the 

Fie. 153.—Flower of Mimulus, with petaloid calyx. 
calyx, the edges of the limb remaining green, the middle 
of the imb being purple (Primula tricolor). 
Under this head may be mentioned the occurrence of 
tubular sepals in place of the ordinary flat ones in 
Helleborus olympicus ; only two of the sepals were thus 
affected im 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 persica,’ 
Calceolaria, Sc. Jc. In the last-named plant one or 
more of the lobes of the calyx may frequently be seen 
replaced by a slipper-lke petal. 
or 
1 Schlechtendal, ‘ Linnza,’ ix, p. 757. 
