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THE AMERICAN NATURALIST [Vol. XLVI 



the broader-leaved, more luxuriant forms such as the 

 gardener would be likely to select for cultivation. 



5. Hybrids in the F x Generation from the 

 Cultures of 1911 

 The most important cultures of 1911 in the F x genera- 

 tion were those of the following combinations of parent 

 species. 



1. grandiflora Bx biennis D (11.35). 



2. grandiflora D X biennis D (11.32). 



3. grandiflora I X biennis D (11.37). 



4. grandiflora D X Tracyi (11.33). 



Of these the most interesting, with respect to the 

 resemblance of some of its plants to Lamarckiana, was 

 the first culture in the list — grandiflora Bxbiennis D 

 (11.35). The greater part of this account will conse- 

 quently be devoted to this culture, but the others will be 



briefly described, chiefly with reference to the coloration 

 of the papillate glands in which all four cultures agree in 

 exhibiting a behavior that was not to be expected. 



1. grandiflora Bxbiennis D (11.35).— This culture 



