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- North Dakota southward to eastern Oklahoma and N Louisiana
- N Louisiana eastward to E South Carolina
- E South Carolina northward to central Maine
- Central Maine westward to North Dakota
The American hazelnut, also known as the American filbert, is usually a large shrub but may grow to be a small tree approaching 20 feet in height. The leaves are roughly serrated, without distinct lobes. The male catkins release their pollen in early spring before the leaves appear, and the tiny female flowers (resembling buds with protruding pistils) develop into the familiar edible acorn-like hazelnut surrounded by leafy bracts.