ACCOUNT OF GENUS SEDUM AS FOUND IN CULTIVATION. 145 
number of plants, largely European and Mexican, with few or no 
close allies, displaying a wide range of characters. The most . 
convenient subdivision of this large and heterogeneous section is 
founded on flower-colour, growth-form, and leaf-shape. 
Among Old World Sedums, S. populifolium, with its twiggy, erect 
growth, differs much from- the typical Seda Genuina ; but in Mexico 
many species occur of habit linking up populifolium with the others, 
and pointing to its inclusion with them among the Seda Genuina. 
VOL. XLVI. L 
