Plate xix. 



Fig. i. Onagra lamarckiana and Onagra nanella in bloom. 



Photographed at 6 a. m., August g' 1904. 







$m. 



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Fig. 2. Onagra lamarckiana X Onagra biennis. 

 No. 2.32 at left and right in foreground; No. 2.24 in center. 



