IOWA ACADEMY OF SCIENCES. 
161 
This species occurs in rich woods, flowering in April and 
May and the fruit ripening in October or November. It is 
common throughout the state. The wood is heavy, hard, 
strong, coarse-grained, liable to check in seasoning, and 
takes a beautiful polish. The wood has been much used in 
cabinet making, interior finish, for gun stocks, picture 
frames, etc. For many years walnut logs were a common 
shipment until the supply was practically exhausted. Oak 
has now taken the place of the walnut in cabinet making. 
The corrugated nut is frequently gathered and kept for 
sale. A decoction of the bark is a frequent domestic dye. 
Our specimens are from Johnson, Jefferson, Decatur, and 
Pottawattamie counties. We have observed the species in 
Winneshiek, Allamakee, Clayton, Dubuque, Jackson, Scott, 
Lee, Van Buren, Appanoose, Ringgold, Union, Page, Tay- 
lor, Fremont, and Montgomery counties. The State Uni- 
versity herbarium has specimens from Story, Calhoun, and 
Delaware counties. Prof. Pammel reports the species 
from Woodbury, Hamilton, Boone, and Hardin counties; 
Mr. Reppert, from Muscatine county; Prof. Bessey, from 
Fayette and Des Moines counties; Prof. Mac bride, from 
Dubuque, Humboldt, and Dickinson counties; Mr. Gow, 
from Adair county; Mr. J. P. Anderson, by note, from 
Lucas county; and Mr. Mills, by letter, from Henry county. 
In general the black walnut is common throughout the 
state and represented mostly by the second growth trees. 
Parry, in Owen’s Geol. Sur. Wisconsin, Iowa, and Min- 
nesota, p. 618; White, Geol. Sur. of Iowa, Vol. 1, p. 138. 
Bessey, Contr, to the Flora of Iowa in Fourth Report Iowa 
Agr. Col., p. 118; Arthur, Contr. to the Flora of Iowa, p. 
29; Nagel and Haupt, Proc. Davenport Acad, of Natural 
Sciences, Vol. 1, p. 163; Hitchcock, Trans. St. Louis Acad, 
of Science, Vol. 5, p. 157; Pammel, Proc. Iowa Acad, of 
Sciences, Vol. 3, p. 132; Iowa Geol. Sur., Vol. 10, p. 312; 
Fink, Proc. Iowa Acad, of Sciences, Vol. 4, p. 101; Fitzpat- 
rick, Proc. Iowa Acad, of Sciences, Vol. 5. p. 127 and p. 
163; Vol. 6, p. 196; Iowa Geol. Sur., Vol. 8, p. 313; Came- 
ron, Iowa Geol. Sur., Vol. 8, p. 198; Macbride, *Iowa Geol. 
Sur., Vol. 4, p. 119; Voi. 7, p. 107; Vol. 10, p. 237 and p. 
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