1922] Setchell-Goodspeed-Clausen : Nicotiana Tahaeum 479 



form except for one aberrant ( ?) plant of a decidedly lighter shade. 

 Two "normal" parents of F^ gave 88 and 100 plants of F.^ in 1914, 

 which were uniform and of a bright pink color. In 1915 Fg showed 

 10 plants, and in 1916 F. also showed 10 plants, still uniform and pink. 



Type 12a on being segregated in the second growing of Fg in the 

 season of 1913 yielded 100 plants of F^ in 1914, uniform and of deep 

 red flower color. Fj, of 10 plants in 1915, and also Fg, of 10 plants in 

 1916, produced uniform individuals of deep red flower color. 



We find, then, in types 12 and 12a definite fixations of the lorii- 

 FOLiA type, one with uniformly pink flowers and one with uniformly 

 deep red flowers. 



e. AuRicuLATA derivatives 



Type 8 is represented in F. by a plant which had a leaf with an 

 extremely constricted base (cf. pi. 70) and deep red flowers. It is 

 not a typical auriculata derivative, but is included under this heading 

 because it resembles the members of this class more closely than those 

 of any other. Fg, 12F3H2P3P^i, consisted of 25 plants which were 

 uniform in height, habit, and flower color, and in agreement with Fo 

 in these respects. The leaves, however, were of two distinct types, 16 

 AURICULATA of type 8 and 7 sessilifolia of type 16 (cf. pi. 78), the 

 latter being near to the type of macrophylla. No further generations 

 of this line were grown. 



Type 10, as shown by the drawing (pi. 72), had a peculiar leaf, 

 near to the macrophylla type, yet deeply constricted at the base into a 

 narrow and extremely abbreviated structure which may resemble a 

 petiole or only a deeply constricted blade. There were, however, 

 auricles partially clasping the stem and slightly decurrent. The leaf 

 form was that characteristic of N. Tabacum var. macrophylla purpurea 

 (cf. Setchell, loc. cit.). All 24 plants of Fg had the same type of leaf 

 as F2, but the flowers were of three fairly readily distinguishable 

 shades ; 3 were red, 16 pink, and 5 light pink. Fo had very dark pink 

 flowers. The line was not grown in further generations. 



Type 6a is a true auriculata derivative which segregated in Fg 

 from an F, latipolia selection. Its occurrence and behavior are de- 

 scribed in connection with the account of type 6, the latipolia type 

 from which it segregated. Grown in the pure line for five generations 

 it has remained constant for the auriculata type of leaf. 



