12 Russell— Comparison of the Structure of Hybrid 



In S.flava the epidermal cells are longer than broad (PI. Ill, 

 fig. 9) with an angular wavy wall. Stomata are fairly numer- 

 ous, seven to a field, and of the same size as within the pitcher 

 (•035X.030 mm.). Glands are less numerous than within on 

 the specially modified surfaces, one only to a field averagely. 

 The unicellular hairs mentioned above are in 5. flava blunt, 

 with a decided bending or hooking in some, while in others 

 the axis is straight or merely slightly curved. They vary 

 greatly in size, from mere knobs .01 mm. long to .1, .2, .3 mm. 

 in length. PI. Ill, fig. 9 will show the range of size and shape 

 in these hairs. It will be noted that in all the surface of the 

 hair is raised in wart-like thickenings, which at times lie in 

 lines parallel to the axis of the hair, and suggest the rough be- 

 ginnings of the beautifully regular striae found on the hairs 

 of the inner pitcher surfaces. There are three hairs to a field. 



The epidermal cells of S. purpurea (PI. Ill, fig. 8) are more 

 rounded wavy in outline than in S. flava. The stomata are 

 more numerous, 16-17 appearing in a field. The glands are 

 but slightly more frequent than above, 1.5 to a field. The 

 hairs are straight, and vary in size even more than in S. flava 

 .1, .2, .3, .4, etc., to .5-. 6 mm. They are not quite so numerous 

 as the hairs of S. flava, only two to an average field. 



5. Catesbaei (PI. Ill, fig. 10) shows epidermal cells more 

 closely resembling S. purpurea. The stomata are fairly inter- 

 mediate in number — 11 per field. There is one gland per field 

 about as in the parents. The hairs, of course, inherit the 

 tendency to variability. Some hairs have the marked S. flava 

 tendency to bending, though not so strong. On the whole, 

 the range of size is much as in S.flava from .1 to .3 mm. There 

 is one hair per field, less than in either parent. 



Inner Lid Region 



The epidermal cells of the inner portion of the lid are in all 

 cases irregular in shape. In 5. purpurea they are about as long 

 as broad (.065 x .05 mm.) with very wavy wall. 



In 5. flava the hairs are numerous, and compress the epi- 

 dermal cells without hairs into oblong cells (.05X.03 mm.) 

 with walls but slightly wavy. 5. Catesbaei shows cells resem- 

 bling S. purpurea in size and shape (.06 X. 047 mm). 



