470 University of California Puhlications in Botany [Vol.5 



14 types (pis. 64 to 77) are clearly intermediates approaching one 

 parent more than the other, but types 12, 13, and 14 (pis. 74 to 77, 

 inclusive) are decidedly different from either as to leaf, at least, and 

 type 10 (pi. 72) is of another altogether different form, although all 

 of these leaf shapes are connected to a greater or less extent into one 

 series of more or less gently intergrading forms. 



As to the shape and dimensions of the corolla there is to be found 

 a similar series of intergrading forms from the slender corolla tube 

 with gradually expanding and slightly swollen infundibulum and 

 deeply lobed limb of type 1 (pi. 63) to the corolla with stout tube, 

 abruptly and considerably swollen infundibulum with slightly lobed 

 limb of type 16 (pi. 78). In color the corollas vary from the light 

 pink of angustifolia to the red of macrophylla and three shades are 

 at times fairly readily distinguishable, the light pink of angustifolia, 

 the deep pink of F^, and the several nuances of the red of macrophylla. 



The capsules also show various combinations from the slender 

 gradually attenuated capsules of angustifolia to the stout, swollen, 

 abruptly upwardly attenuated capsules of macrophylla. Both cap- 

 sules and corollas approaching one parent may be found with leaves 

 more closely approaching the other parent. In stature and habit the 

 plants of all the 21 families were reasonably uniform and agreed in 

 general in these respects with the parents and Fj, there certainly being 

 no greater amplitude of variation in these respects than was to be 

 found in the parental types. 



Among the great variations, two characters seemed to stand out 

 fairly clearly for rough statistical enumeration, viz., color of the 

 corolla and the possession, or lack, of a petiole. Numerical data for 

 these characters are given in table 1. Some care was taken to obtain 

 a careful census of the families as regards each of the characters. As 

 regards colors, it was, as noted before, possible to distinguish three 

 shades, or sets of shades, which were designated as light pink, pink, and 

 red. In practice, however, it was usually difficult to distinguish the 

 two shades of pink from each other. The red gave very little trouble. 



In attempting to classify the plants of F, with respect to type of 

 leaf base, more difficulty was experienced because of the variety of 

 forms which were produced and the degree of intergradation w^hich 

 existed between forms. In judging the presence or absence of petiole, 

 therefore, in these populations, the classification is faulty because of 

 lack of knowledge of the genetic constitution of the various distinct 

 forms and those which grade into them. In table 1 the plants are 



