162 IOWA ACADEMY OF SCIENCES. 



645; Ctow, Proc. Iowa Acad, of Sciences, Vol. 6, p. 62; Rigg, 

 Notes on the Flora of Calhoun County, p. 25; Barnes, Rep- 

 pert, and Miller, Proc. Davenport Acad, of Natural Sci- 

 ences, Vol. S, p. 255; Reppert, Iowa Geol. Sur., Vol. 9, p. 

 386; Arthur, Flora of Floyd county in History of Floyd 

 County, p. 300; Bot. Gaz., Vol. 7, p. 127. 



JiKjlans ciuerea L. Sp. PI. Ed. 2, 1415, 1763. Butternut. 

 White Walnut. A tree, smaller than the black walnut, 

 bark gray, twigs and petioles viscid-pubescent; leaflets 11- 

 19, oblong-lanceolate, acuminate, base obtuse, roujided or 

 truncate; fruit oblong, pointed, clammy, 2-celled at the 

 base. 



The wood of this species has many characters in common 

 with the black walnut and is used in cabinet work, interior 

 finish, etc. The wood differs from the black walnut in 

 being light, soft, of less strength, and of a light brown 

 color. Trees rarely exceed 80 or 90 feet in height and are 

 usually less than two feet in diameter. 



Our specimens are from Fayette and Johnson counties. 

 We have observed the species in Jefferson, Allamakee, 

 Winneshiek, Clayton, and Dubuque counties. The state 

 university herbarium contains specimens from Lee, Win- 

 nebago, Des Moines, Cerro Gordo, Delaware, Pottawatta- 

 mie, and Fremont counties. Mr. RepperL reports the species 

 from Muscatine county; Messrs. Nagel and Haupt from 

 Scott county; Professor Bessey from Story county; Professor 

 Macbride from Humboldt county; Mr. Gow from Madison 

 county; and Professor Pammel from Boone and Hardin 

 counties. In general the butternut is frequent all along 

 the eastern border of Iowa and passes through the central 

 portion west to the Missouri river. It appears to be absent 

 in our strictly southern counties. A decoction of the bark 

 is frequently employed in domestic dyeing. 



White, Geol. Sur. of Iowa, Vol. 1, p. 138; Bessey, Contr. 

 to the Flora of Iowa in Fourth Report of Iowa Agr. Col., 

 p. 118; Arthur, Contr. to the Flora of Iowa, p. 29; Nagel 

 and Haupt, Proc. Davenport Acad, of Nat, Sciences, Vol, 

 1, p. 163; Hitchcock, Trans. St, Louis Acad, of Science, Vol. 

 5, p. 517; Pammel, Iowa Geol, Sur,, Vol, 9, p, 243; Vol. 10, 



