willow oak Fagaceae Quercus phellos L. Listen to the Latin symbol: QUPH Other Fact Sheets
Leaf: Alternate, simple, 2 to 5 inches long, linear or lanceolate in shape (willow-like) with an entire margin and a bristle tip.
Flower: Species is monoecious; males borne on slender yellow-green catkins; females borne on very short axilliary spikes, both appear very early with the leaves.
Fruit: Acorns are very small, 1/4 to 1/2 inch across, nearly round and yellow-green, turning tan when older, caps are thin, saucer-like and cover only 1/4 of acorn with thin, tomentose, appressed scales.
Twig: Slender, hairless, olive-brown in color when young; multiple terminal buds are very small, reddish brown and sharp-pointed.
Bark: On young stems, smooth, gray and tight; later becoming darker and forming irregular rough ridges and furrows.
Form: A medium sized tree up to 80 feet tall that forms a dense oblong crown when open grown; lower branches do not readily self-prune.

Looks like: water oak - laurel oak - shingle oak - Darlington oak
leaf flower fruit twig bark form map
Additional Range Information:
Quercus phellos is native to North America. Range may be expanded by planting. See states reporting willow oak.
More: Fall Color
External Links:
USDAFS Silvics of North America
USDAFS Additional Silvics
Landowner Factsheet
USDA Plants Database
Horticulture
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Photos and text by: John Seiler,
Edward Jensen, Alex Niemiera,
and John Peterson
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