|Leaf Identification / II To the left, you can see leaves from
three different types of oak trees. The Pin Oak, Quercus
palustris, is found in the northern part of the U.S. and
southern Canada, in lowland areas with moderate shade. Its
leaves are usually 3" to 4" with 5 lobes and a wedge-shaped
base. The Jack Oak, ellipsoidalis, is found on higher ground and
its lower branches are usually dead. It has dark green leaves
and the tree has an overall untidy look. The Scarlet Oak,
Quercus coccinea, grows in sandy or gravelly areas. Looking at
its leaves you will find a thin, delicate blade with lobes that
sometimes almost enclose oval spaces. The mid-rib of the leaf is
yellow. the right you can see two leaves from walnut trees.
Leaflets arranged along opposite sides of the stem like these
are called pinnate compound leaves (for more information, see
Leaf Terms). The Black Walnut, Juglans nigra, is found on high
ground over a vast majority of the United States. It is somtimes
missing the end leaflet, and all the si