294 The Pedigree Families. 



distinguished from 0. Lamarckiana by its much more 

 robust and still broader leaves (Fig. d2 g and L). 0. 

 nibrinervis (Fig. 52 r) and 0. scintillans (s) have nar- 

 rower leaves, those of the former being gray-green, those 

 of the latter dark green, whereas the surfaces of the 

 leaves of 'both these forms are hardly crumpled at all. 

 O. albida (Fig. 53 a) and 0. oblonga (o) are scarcely 

 recognizable at this age by the form of their leaf. O. 

 albida varies very much according as whether one is 

 dealing with the ordinary w^eakly forms or with plants 

 which have grown up strong as a result of special care. 



fThe leaves of the former are 

 small and narrow, pale green and 

 often even almost white ; those 

 of the latter are chiefly recog- 

 nizable by their pale color. O. 

 oblonga has leaves with very 

 broad main veins : this breadth 

 is much more striking on the 



Fig. 53. Full grown leaves "PP^r than on the lower surface 

 of young roseues in June, which is the one figured. They 

 a, O. albida; o, O. oblonga. • i i , i i 



are pomted and, when the plants 



are young, broad ; but later they become very narrow. 



For comparison with the leaves of the young plants 



there are shown in Fig. 54 the grown leaves of flowering 



plants. The leaves were plucked from the plants just 



below the first flower-bearing nodes. They are the same 



species as those whose seedling leaves have already been 



figured, with the exception of O. lata, O. Lamarckiana 



and O. nanella.^ 



^ I have copied these leaves photographically by spreading slightly 

 faded ones out on sensitized paper and then printing under glass ni 

 an ordinary printing frame. I then photographed the prints, reducing 

 them to about one-half. 



