W. Neilson Jones 79 



The nectaries of the hybrids are intermediate in character between 

 those of the two species, but differ from one another in inclining 

 markedly towards the respective female parents as to size and shape in 

 relation to the capsule (text-figs. 11 and 12). 



The differences between the four plants is not confined to the flower 

 parts, as the leaf characters alone are sufficiently distinct to enable one 

 easily to assign any plant to one of the four classes. 



12. Leaves. The leaves of D.P. are large and broad (the radicle 

 ones being as much as 30 cm. long and 10 cm. broad), ovate in shape 

 and, with the exception of those some way up the flowering axis, with 

 a well-marked petiole. 



The leaves of D.G. are never as large as the above (the larger ones 

 are about 18 cm. long and 3 cm. broad) and much more linear in shape. 

 They taper gradually to a rather shai'p apex instead of being obtuse as 

 in D.P., and there is no demarcation between lamina and petiole, the 

 leaf gradually narrowing towards its base which is much broader than 

 in D.P. 



The leaves of the hybrids are intermediate in size and shape : those 

 of {D.P. X D.G.), however, resemble more closely the leaves of D.P., 

 while the leaves of {D.G. x D.P.) are almost indistinguishable from 

 D.G. as regards shape. 



The above differences in leaf-form are most noticeable in the radicle 

 leaves. 



13. Much more definite than the differences in shape are the 

 differences in texture and surface of the leaves of the four types. 

 Photographs of the under sides of the radicle leaves of D.P., D.G., 

 {D.P. X D.G.), and {D.G. x D.P.) are shown in Plate V. 



In D.G. (Plate V, fig. 9) it will be seen, that while the midrib and 

 some of the larger longitudinally running veins ai'e raised somewhat 

 above the general surface of the leaf, the smaller veins are quite 

 invisible. 



In D.P. (Plate V, fig. 8), however, all but the very smallest veins 

 stand up prominently above the surface in the form of a network 

 covering the entire under surface of the leaf. 



There is a correspondiug diff'erence in the upper surfaces of these 

 leaves ; D.G. being quite smooth except for slight depressions along the 

 midrib and some of the larger veins, while the whole upper surface of 

 D.P. is covered with a conspicuous network of furrows. 



As will be seen from figs. 10 and 11 of Plate V, the hybrids are 

 intermediate between these two conditions, the reciprocals differing in 



