CHAPTER VI. 



MISCELLANEOUS. 



A FEW general hints upon various side questions 

 may here be conveniently thrown together in con- 

 cluding our hasty survey. They must be accepted 

 in most cases merely as suggestions for observation 

 on the reader's own part. The subject is still a new 

 one, and only vague ideas can as yet in certain 

 directions be formulated upon it. 



We have seen in several cases already that flowers 

 which have lost their corolla often tend to re-develop 

 brilliant colours in their calyx, as in Sanguisorba; while 

 flowers which have lost both corolla and calyx often 

 tend to re-develop such colours in bracts, involucres, 

 or leaves, as in latropha and Poinsettia. Among our 

 British Monochlamydce there are comparatively few 

 instances of such coloured calyxes, Glaux, Daphne 

 mezereum, and Ulmus, being our best examples ; but 

 in many well-known exotic species, such as Mirabilis 

 dichotoma, marvel of Peru, and the Begonias, the 

 calyx is quite as beautifully coloured as any corolla. 

 In Bougainvillea, three lilac bracts form the attractive 

 organ. In Aristolochia, the tubular calyx simulates 

 an irregular corolla, and in A. cordata it is large and 



