232 IRREGULAR PELORIA. 



question become regular by the repetition of the irregu- 

 lar parts. 



It is probable that peloria may occur in any habitu- 

 ally irregular flower, and that, if more attention were 

 directed to the subject, illustrations might be obtained 



Fio. 123. Two-lipped flower of Aristolochia caudaia. 



from a larger number of natural families than can be 

 done at present. It is, however, necessary to exercise 

 discrimination, and not to attribute to peloria all the 

 cases that at first sight appear to be so referable. 

 Thus, Professor Dickson exhibited at the Botanical 

 Society of Edinburgh, December 13th, 1860, four 

 abnormal flowers of the common Indian cress {Tropceo- 

 lum ma jus) ^ each presenting a supernumerary spur. On 

 these he remarked that " in Tropocolnm the posterior 



