A medium to large tree up to 100 feet in height that developes a straight, clear bole with a narrow crown under competition, twigs and branches quite stout. Leaf, alternate, pinnately compound, 12 to 24 inches long with 10 to 24 leaflets, leaflets are ovate-lanceolate, finely serrate, and 3 to 3 1/2 inches long, rachis is stout and somewhat pubescent; yellow-green to green above, slightly paler below. Flower, monoecious; males are single-stemmed catkins, 2 1/2 to 5 1/2 inches long; females on short spikes near twig end, yellow-green in color, appearing in late spring. Fruit, round, 2 to 2 1/2 inches across, with a thick, green indehiscent husk.

Alterative, anodyne, astringent, blood tonic, detergent, emetic, laxative, pectoral and vermifuge (bark and leaves)

Plants for a Future: Database Search Results
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Floridata
Juglans nigra L.

Ascorbic acid (hull husk); beta-carotene (hull-husk, seed); ellagic acid, myricetin, myricitrin, tannin (fruit); juglone (plant); niacin, riboflavin, thiamin (fruit, seed)

In the treatment of skin diseases, scrofulous diseases, herpes, eczema etc; diarrhoea and also to stop the production of milk, to allay the pain of toothache, headache (bark); for ringworm, colic and applied as a poultice to inflammations (husk); in the treatment of gangrene, leprosy, and wounds (oil from ripe seeds)

External carcinogenic effects noted after chronic use of Juglans regia, which contains juglone (AHP). Should not be used for more than a few weeks at a time.