10 ARRANGEMENT OF LEAVES. 
the leaf-stalk, and much resembles a compound leaf, 
but is in reality a simple one; for each little leaf is 
completely united with the leaf-stalk, and cannot be 
separated from it without tearing either one or the 
other; while the little leaves of the Jasmine can be 
made to fall off at a little joint which exists between 
each little leaf and the leaf-stalk. 
ec. Again, the leaf of the Laburnum, Trefoil, or 
Clover, is a compound leaf, as each little leaf is jointed 
to the leaf stalk; so also the little leaves of the Robinia 
or False Acacia (f.5.), of the Bladder Senna, and 
Rose Tree (f. 1.), are jointed to the leaf-stalk ; in f. 5. 
a little leaf has been removed, showing the way in 
which these parts of the compound leaf sometimes fall 
off of their own accord. 
The character then of a simple leaf is, that neither 
the blade nor any of its divisions separate from the leaf 
stalk or petiole: and that the compound leaf consists 
of a leaf-stalk which supports a number of little leaves, 
(called also leaflets), each of which are jointed to it, 
just as the leaf-stalk is to the stem of the plant. 
OF THE ARRANGEMENT OF LEAVES ON THE STEM. 
12. Leaves not only give a character to the plants 
to which they belong by their colours and forms, but 
also by the manner in which they are placed or arranged 
on their stems. This will be soon apparent by com- 
paring some of the following examples; for instance, the 
leaves of the Currant, Gooseberry, Elm, Oak, and Lime 
Tree (pl. 4. f. 2.), are very differently arranged on their 
stems to those of the Lilac (f. 1.), Mint, Dead Nettle, 
