THE PRINCIPLES OF BOTANY. 
185 
Leaf of Begonia tuberosa, £ nat. size. 
The margin a dark purple, the rest of the leaf a silvery white. 
the species, but also for bearing separate buds or bulbels 
in the axes of the leaves, which readily grow to make new 
plants. 
Taken altogether, then, the Begoniads form an interesting 
group of plants, which would seem to deserve attention, 
not only for their ornamental appearance, but for the 
possession of useful properties. 
We finish this article by a few remarks upon a rather 
restricted alliance in that of the Papayales, in which we 
