JUGLANDACEAE 
Black Walnut 
Juglans nigra L,. 
HABIT.—A large tree 60-80 feet high, with a massive trunk 
2-5 feet in diameter; forming an open, capacious crown of ‘hheavy 
branches and coarse branchlets. 
LBEAVES.—Alternate, compound, 1-2 feet long. Leaflets 
13-23, the terminal often lacking, 2-4 inches long and one-half 
as broad; sessile; ovate-lanceolate, taper-pointed; sharp-serrate; 
thin; yellow-green and glabrous above, lighter and soft-pubescent 
beneath. Petioles stout, pubescent. Foliage aromatic when 
bruised. 
FLOWERS.—May, with the leaves; monoecious; the stam- 
inate in cylindrical, greenish, drooping catkins 3-5 inches long; 
calyx 6-lobed, borne on a hairy bract; corolla 0; stamens numer- 
ous, with purple anthers; the pistillate solitary or several on a 
common peduncle, about % inch long, their bracts and bractlets 
hairy; calyx 4-lobed, pubescent; corolla 0; styles and stigmas 2. 
FRUIT.—October ; globose, 114-2 inches in diameter, smooth, 
not viscid; solitary or borne in clusters of 2-3; nuts with irregu- 
larly furrowed shell, inclosing 'a sweet, edible kernel. 
WINTER-BUDS.—Terminal bud % inch long, ovoid, 
obliquely blunt, slightly flattened, silky-tomentose. 
BARK.—Twigs brownish and hairy, becoming darker and 
smooth; thick, brownish or blackish on the trunk and deeply 
furrowed by broad, rounded ridges. 
WOOD.—Heavy, hard, strong, close-grained, very durable in 
contact with the soil, rich dark brown, with thin, lighter colored 
sapwood. 
DISTRIBUTION.—Lower Peninsula as far north as Bay 
City, but more abundant in the southern portion of its range. 
HABITAT.—Prefers rich bottom-lands and fertile hillsides. 
NOTES.—Leaves appear late and fall early. Fruit very 
aromatic. Pith chambered, cream colored. The juices from the 
husk stain the hands brown. Not easily transplanted. Often 
infested with caterpillars. 
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