116 © JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
alliand P. barbatum together preponderate in form; and P. Boxalli and 
P. venustum together prevail in colour of leaves. © 
P. x Pluto, XVIII.—P. venustum alone predominates in habit; P. 
barbatum alone preponderates in form; while P. Boxalli and P. venustum 
together prevail in colour of leaves. 
P. x Pluto, XIX.—P. barbatum alone predominates in habit, while 
P. Boxalli and P. barbatum together preponderate in form and colour of 
leaves. 
P. x Pluto, XX.—P. Boxalli and P. venustum together predominate 
in habit and form of leaves. 
P. x Pluto, XXI.—P. Boxalliand P. barbatum together predominate 
in habit, while P. Boxalli alone prevails in form and colour of leaves. 
P. x Pluto, XXII.—P. barbatum alone predominates in habit and 
form, while P. Boxalli and P. barbatum together preponderate in colour 
of leaves. 
P. x Pluto, XXIII.—P. Boxalli and P. venustum together predomi- 
Fic. 39.—Papuiopepitum x Puuro vars. I._XXIV. 
(P. Boxatur atrattm 9 x P. x potrtum 3.) 
nate in habit; P. barbatum alone preponderates in form ; and P. Boxalli 
alone in colour of leaves. 
P. x Pluto, XXIV.—P. venustum alone predominates in habit; P. 
barbatum alone preponderates in form ; while P. barbatum and P. venus- 
tum together prevail in colour of leaves. 
All the hybrids, without exception, show distinct traces of both the 
parental and ancestral species, but in different proportions. Certain in- 
dividual parts of some of the hybrids are fairly well balanced between 
their three pedigree species; in other parts one or other of the three 
species clearly predominates ; while in other parts, again, any two of the 
three species prevail; and so on through all the variations, the 
changes being rung on the different parts by the three pedigree species, 
both in form and colour, giving rise to numerous variations. Indeed, in 
the one case detailed above, out of twenty-four hybrids raised from the 
