PLATE XVI. 



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Stem leaves, bracts, petals, capsules, and flowers of Onagra biennis and of two of 

 the four hybrid types of Onagra lamarckiana X Onagra biennis. 



i, Onagra biennis ; 2, No. 2.27; 3, No. 2.32. Stem-leaves one-fourth natural size; remainder of 



figures five-eighths natural size. 



