APOSTASIS. 



441 



and are, in some cases, united by their margins, so that 

 a spiral sheet or tube is formed, surrounding the axis. 

 This fi-equently occurs in double flowers of the Chinese 

 primrose, Primula .sinensis. 



Engelmann^ figures a case wherein the calyx of 

 Ana^alUs phoenicea was separated by a rather long in- 

 ternode from the corolla, and a like illustration 

 Ton lis Anthnscus. 



m 



Fio. 209. Flower of Delphinium, showing apostasia of carpels, from 

 lengthening of the thalamus, &c. (Cramer.) 



' Loc. cit., tab. 2. f. 6. 



