Black walnut, American walnut, eastern black walnut, walnut.
A valuable tree that often grows to more than 120 feet in height, with almost black bark divided into rough ridges by deep, narrow furrows. Leaflets are alternate, commonly 12 to 23 per stem, finely toothed, and 3 to 3 ½ inches long. The fruit occurs singly or in clusters of 2 or 3, and has a thick, somewhat fleshy, aromatic husk; the fruit is roundish, about 1 ½ to 2 inches in diameter, edible, and has a hard, rough, deeply furrowed shell.
April to June.
Rich woods and limestone soils.
Inner bark of root; leaves and nuts in fall.
The root bark is cathartic. A leaf infusion is used as an astringent and against bedbugs.