Sarracenias with that of Their Parents 37 



exact. It extends to microscopic details in structure to be 

 noted below. 



The epidermal cells of the outer surface of the pitcher and 

 of the inner lid surface show a blended appearance in the 

 hybrid. Take for example 5. Moorei (fig. 12), whose cells are 

 intermediate between the rounded epidermal cells of S. Drum- 

 mondii (fig. 11) with their pronounced papulation; and the 

 wavy walled cells, without papillae, of S. flava (fig. 9). 



The epidermal cells of the conducting surface of the hybrids 

 are remarkably intermediate between the parents. Here there 

 are measurable differences in length of cell and tip of process, 

 and it has been shown that the hybrid lies exactly between the 

 parents in length relation, breadth, and tip length. 



On the outer and inner surfaces where stomata are present, 

 the hybrid shows the number present in a given field to be an 

 exact arithmetical mean between the numbers present in the 

 parents. In regard to their distribution it has been noted that 

 in other species the stomata are equally distributed over the 

 surface, while in S. Drummondii they are limited to special 

 tracts between the window areas. The hybrids with S. Drum- 

 mondii show the stomata distributed in wide tracts (figs. 12, 14). 



The unicellular hairs distributed over the various surfaces 

 show several interesting relations. 



On the detentive surface, the hybrid presents an arithmetical 

 mean between the parent types in number and length of hair in 

 each set. Over the outer surface of the pitcher, where the 

 hairs are irregularly scattered, the relation is somewhat ob- 

 scured. But in S. flava (fig. 9), S. Catesbaei (fig. 10) , 5. pur- 

 purea (fig. 8) one may see how the hybrid shows a variety of 

 hair lengths inherited, and an intermediate degree of blending 

 in the hairs. 



On the inner lid surface, the hairs of all except two species 

 show great variability in length. The hybrids with either of 

 these two forms S. flava and S. Sledgei as a parent, having fairly 

 uniform hairs, with any of the other forms, having variable 

 lengths, show hairs of all lengths reproduced, but fewer in 

 number and with the longest hairs much reduced. 



This behavior of hair-length inheritance has been noted be- 

 fore in other plants (29) so that this seems to be a rule of inheri- 

 tance for hair length and number. 



