PLATE VI. 



Onagra biennis. 



i, leaf from young rosette; 2, leaf from rosette four months old; 3, leaf from lower part of mature 

 rosette; 4, leaf from upper part of mature rosette; 5, stem-leaf; 6, bract; 7, unopened bud; 

 8, flower with petals removed; 9, petals of maximum size; 10, mature capsule, i to 5, one-half 

 natural size ; 6 to 10, natural size. 



