PLATE XVII. 



Stem-leaves, bracts, petals, capsules, and flowers of Onagra lamarckiana, and of two 

 of the four hybrid types of Onagra lamarckiana X Onagra biennis. 



4, No. 2.1; 5, No. 2.24; 6, Onagra lamarckiana. Stem-leaves one-fourth natural size; remainder 

 of figures five-eighths natural size. 



