258 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY, 



sociation of form and colour reveals the parentages, in that 

 Princess Royal and B. javanicum and B. jasminiflorum are 

 clearly present. As pure yellow forms occur, such would probably 

 point to B. Brookeanum, var. gracile. Consequently, as it 

 was known to be a second generation, it was most probably one 

 of the three following, Princess Frederica, Orown Princess of 

 Germany, or Duchess of Teck. 



The foliage is very variable, with a frequent want of symmetry 

 in the two halves of the blade. 



BlGENEK, INDICO- JAVANICUM (FIG. 41). 



This is a bigeneric cross between Rhododendron Lord 

 Wolseley (fig. 44, m) and Azalea indica stella. 



The female parent is of the third generation, the descent being 

 as follows : — B. jasminiflorum (white) xB. javanicum (orange)= 

 Princess Royal (pink) ; Princess Royal x B. Brookeanum, var. 

 gracile (yellow) = Duchess of Teck (reddish orange) ; Duchess of 

 Teck x B. javanicum (orange) = Lord Wolseley (red-orange). 



The male parent has a dark rose-coloured corolla, with crimson 

 spots over the upper petals. 



The corolla of the cross is smaller than that of either parent, 

 having a broadish, nearly straight tube, slightly bulging above ; 

 the lobes of the limb are much shorter than is the case with 

 either parent. 



The colour is a rather redder orange than that of the female 

 parent ; the anthers are crimson, as well as in both parents. 



With regard to the foliage of the cross, though smaller in 

 size the leaf agrees both in form and anatomical details with 

 that of the Rhododendron or female parent in every detail of 

 importance. The leaf of Azalea is markedly different, being 

 obovate instead of lanceolate ; toothed, and not entire ; covered 

 with fibrous hairs instead of being glabrous above, with minute 

 peltate scales below ; the cell-walls of the epidermis being sinuate 

 instead of straight ; and the proportion of stomata being less 

 than in the Rhododendron as well as the cross. The hairs of the 

 Azalea are very peculiar in structure. They grow on the branches, 

 petioles, midrib, and veins below, and are generally scattered over 

 the upper surface of the leaf. They are composed of numerous 

 fibres resembling short liber-fibres, graduated in length, so that 



