There are many exceptions
in classification. The phyllode (false leaf) of Acacia sp.
is modified from a branchlet with parakkek venation although
it is a dicot. Besides, the leaf of Casuarina equisetifolia
is highly reduced in size. The short scale leaves are
almost similar to the needle leaves of Pinus sp. is
a gymnosperm while Casuarina sp. is a dicot of angiosperm.