Studies of Teratological Phenomena. 



91 



The relation of this race to different environmental conditions 

 and the nature of the variability in expression of the fasciation factor 

 will be further discussed under "selection and environment". 



402. Nicotiana tahacum L., var. "Cuban" (Fig. 13). (13—29 U. S. 

 Dept. of Agr.) Grown in controlled cultures for at least three years. 



Fig. 13. Enlarged view of the inflorescences of Nicotiana iabacuvi^ races 300 — 309, 402. 

 (Photographs from Fg segregates of 304 X 402.) 



Remarkably constant in all its characters. As contrasted with 300 — 309, 

 it is normal in all the organs altered in that race by the fasciated 

 character. A possible exception to this generality is found in the rare 

 occurrence of an extra sepal or petal. Stem cylindrical, number of 

 leaves per plant 18 — 24 with mode of 20, ave. 19-65, based on counts 

 made by East and Hayes on 124 plants grown at Bloomfield, Conn, 

 in 1911; inflorescence branched, flowers pink, three whorls 5-lobed, 

 gynoecium 2-loculed. Number of parts to androecium and gynoecium 

 practically constant. Plants in our cultures, uniform in height and 

 other gross morphological features. Same variety as that from which 



