Illinois State Tree – White Oak – Quercus alba
Leaf: Alternate, simple, oblong to ovate in shape, pinnately veined
with an evenly lobed margin, 4 to 7 inches long. The apex is rounded and the
is wedge-shaped. Leaves are hairless, bright green above and whitish below.
Flower: Male flowers are green, borne in naked catkins, 2 to
4 inches long. Female flowers are reddish and appear as single spikes. Appearing
with the leaves.
Fruit: Ovoid, but may be oblong, with a warty cap that covers
1/4 of the fruit. The cap always detaches at maturity. Matures in one year,
ripens 120 days after pollination (July to September).
Twig: Red-brown to somewhat gray, hairless, with red-brown
multiple terminal buds that are small, rounded and hairless. Twigs are often
shiny or somewhat glaucous.
Bark: Whitish or ashy gray, varying from scaly to irregularly
platy or blocky. On older trees smooth patches are not uncommon.
Form: A large tree; when open grown, white oaks have rugged,
irregular crowns that are wide spreading, with a stocky bole. In the forest
crowns are upright and oval.
Conservation; Photos and text by: John Seiler, Edward Jensen,
Alex Niemiera, and John Peterson;Silvics reprinted from Ag
Handbook 654; range map source information