78 



Species Hyhrids of Digitalis 



DPx DG 

 20 



DG ■ DP 

 21 



-I 



Figs. 17—21. 



10. Fruits. The fruits of D.P. are markedly curved lougitudiually 

 and have furrows running along the sides only (text-figs. 9 and 13) : 

 those of D.O. are almost cylindrical and have furrows running not only 

 along the sides but also top and bottom, as is evident in the cross- 

 section of the ovary (text-figs. 10 and 14). The fruits of the hybrids 

 were too imperfect to allow any very definite conclusions to be drawn 

 as to their shapes had they swollen properly ; but in {D.P. x D.G.) the 

 upper and lower furrows are practically invisible on the outside, but are 

 indicated on the in.side wall of the capsule (text-figs. 11 and 15); while 

 in {D.G. X D.P.) these furrows are also more or less observable on the 

 outside (text-figs. 12 and 16). 



11. Although these general characters of the hybrid capsules are 

 admittedly unsatisfactory for the reason given above, the nectaries are 

 more completely developed and easy of comparison. Thus the nectary 

 in D.P. is a rather inconspicuous, narrow band of tissue at the base of 

 the capsule and forms part of the general curve of this latter (text- 

 fig. 9 n). 



The nectary of D.G., on the other hand, is rendered conspicuous by 

 its breadth and by not forming part of the general curve of the capsule 

 (text-fig. 10 n). 



