554 THE AMEBIC AX NATURALIST [Vol. XLYII 



4. The F 2 Generation from 11.3 5 La. —This plant, 

 11.35La (Davis, '12a, pp. 401-406, Figs. 10, 11, 12 and 13), 

 was one of the most interesting of my hybrids because of 

 its strong resemblance to Lamarckiana in buds and foli- 

 age. The coloration of the stem was, however, that of 

 Class II, i. e., it was grandiflora-like in the absence of red 

 in the papillae on green portions of the stem. I had no 

 means of knowing, when this plant was selected as the 

 parent of a second generation, that its type of stem colora- 

 tion was probably recessive to that of the red papillae as 

 found on the biennis parent, and that I should be disap- 

 pointed in my hope of obtaining in an F 2 some plants with 

 the stem characters of biennis D and Lamarckiana. I 

 now believe that such a form is unable to produce in later 

 generations plants with red papillae, and, since this is an 

 important character of Lamarckiana, my efforts with this 

 particular line of hybrids will be discontinued. The F 2 

 generation from 'this plant, however, from the genetical 

 standpoint proved to be one of the most interesting that 

 I have grown and well merits a brief description. 



The contents of 14 capsules, containing 2,217 seeds, 

 were sown, and after eight weeks gave a culture, 12.41, of 

 623 seedlings. An unusual mortality, apparently in a 

 class of dwarfs, reduced the culture finally to 532 plants. 

 The rosettes before they were half grown presented an ex- 

 traordinary range of variation and it became possible to 

 group them although this preliminary classification re- 

 quired considerable revision later. A large group of 

 more than 100 rosettes presented broad closely clustered 

 and crinkled leaves of the Lamarckiana type. Many of 

 these rosettes when half grown were indeed indistinguish- 

 able from those of Lamarckiana at the same age. A 

 smaller group of about 20 consisted of rosettes with 

 narrow leaves ; most of these developed into dwarf forms. 

 Finally, the remainder, constituting what might be called 

 the mass of the culture, contained rosettes ranging on the 

 one hand from a number somewhat grandiflora-like to a 

 few rosettes somewhat close to the biennis type, and be- 



