ALBERT AND GABRIELLE HOWARD. 157 



Siih-class 2. All the internodes equal in length and moder- 

 ately long. 



There is great diversit}^ in height in the eleven types belong- 

 ing to this sub-class, but a wonderful uniformity in leaf shape and 

 structure of the flower, Types XLI, XLIII, XLIV and XLV 

 form a series increasing in height and in size of leaf In other 

 respects they resemble each other very closely. The flowers are 

 of the same type, but show small differences in the amount of 

 indentation of the corolla limb, length of the apical point, etc. (see 

 Plate XLVIII). Types XLI and XLII are almost indistin- 

 guishable from one another, but differ persistently from year to 

 year in the size, colour and texture of their leaves. Type XLVI 

 differs somewhat from this series in the shape of the leaves 

 which are narrowed above the base to a slightly greater extent. 



Types XLVIII, XLIX, L, LI resemble each other very 

 closely in the shape of their leaves and the structure of their 

 flowers and capsules. Types L and LI are exceedingly alike, but 

 type L is shorter and its leaves are more vertical and darker in 

 colour than those of type LI. 



Type XLVIII is very like LI, but is much shorter and the 

 angle of inset of the leaves is 90° instead of G0°. In tj'pe 

 XLIX the leaves are exceedingly vertical. Tj^pes XLVIII, 

 XLIX, L and LI form a series as regards height and differ in the 

 angle of insertion of the leaves. Type XLIX is easily distin- 

 guished in the field by the light colour of its leaves. 



