PLATE 12 



PAGE. 



Figs. a-e. Onagra biennis. Radium culture No. iib. a, flower 

 (minus corolla); b, petal; C, bud from lateral branch, with 

 bract, showing the bursting open of the calyx by the pressure of 

 the stigmatic lobes within ; d, bud, with bract, from main stem ; 

 e, leaf from main stem ........ 249 



f-k. Onagra biennis. Radium culture No. loa. f, flower 

 (minus corolla); g, mature capsule, with bract; h, petal; i, 

 flower-bud, with bract, from main stem ; k, foliage-leaf from 

 main stem .......... 249 



