622 
MONOECIA POLYANDRIA. 
Foeminei. Calyx 4- 
fidus, superus. Corolla 
5-fida. Styli 2. Drupa 
coriacea, sub-spongio- 
sa. Nux rugosa irre- 
gulariterque sulcata. 
Fertile Jlorets. Ca- 
lyx 4-cleft. Styles 2. 
Drupe coriaceous, 
somewhat spongy. Nut 
rugose, irregularly fur- 
rowed. 
I. Nigra. 
J. foliolis numerosis, 
ovato-lanceolatis, ser- 
ratis, subcordatis, su- 
per ne augustatis, sub- 
tus petiolisque sub-pu- 
bescentibus; fructibus 
globosis, scabro-punc- 
tatis. 
Leaves numerous, 
ovate lanceolate, ser- 
rate, slightly cordate, 
tapering to the summit, 
the under surface and 
petioles slightly pube- 
scent; fruit globular, 
scabrous, dotted. 
Sp. pi. 4. p. 456. Walt. p. 235. Mich. 2. p. 191. Pursh, 2. p. 636. 
Nutt. 2. p. 220. 
Icon. Mich. arb. for. 1. p. 157. 
A large tree growing 50 — 60 feet in height, and 2-4 in diameter, with a 
large and spreading head when permitted to expand freely. Leaves alter- 
nate, pinnate, the leaflets numerous, (15 — 21) ovate lanceolate, somewhat 
cordate or unequal at base, the partial petioles very short, and with the un- 
derside of the leaves very pubescent when young. Aments of sterile flowers 
axillary near the termination of the last year’s wood, simple, two or three 
inches long; fertile florets terminal. Fruit spherical, covered with a thick 
spongy undivided pericarp, externally dotted and scabrous, which decays 
after heavy frosts, and exposes the black corrugated nut. 
The timber of the black walnut is compact, fine grained, heavy and dark 
coloured when exposed to the air. It is now much valued; and were it not 
for the facility with which mahogany is obtained, it would form a great por- 
tion of the furniture of our houses. The fruit is well tasted, and is very 
commonly introduced on our tables. 
This tree grows only in the richest soils. It is sparingly disseminated 
along the sea-coast; more frequent, I believe, in the vallies near the Moun- 
tains. 
Flowers April. 
2. Cinerea. Lin. 
J. foliis numerosis, 
lanceolatis, serratis, 
Leaves 
lanceolate. 
numerous, 
serrate, 
