IOWA ACADEMY OF SCIENCES. 
195 
broad dome, one-third or one-half immersed; cup saucer- 
shaped. 
The character of the dome of the acorn readily distin- 
guishes this species from Quercus marylandica Muench. 
Our specimens were obtained in one locality in Decatur 
county, which, so far as we know, is the only locality in 
the state. We published the species in Yol. 8, p. 814, Iowa 
Geological Survey as frequent. The publication was based 
upon genuine specimens, but at that time we had not 
learned to distinguish the species from Quercus marylandica 
Muench. We now believe that Quercus nigra L. is a rare 
species in Iowa. We have also published the species in 
Proceedings of the Iowa Academy of Sciences, Vol. 5, p. 
164. All the trees we have observed occurred on dry 
uplands, and were associated with Quercus marylandica 
Muench. 
Arthur, Contr. to the Flora of Iowa, p. 29; Fitzpatrick, 
Proc. Iowa Acad, of Sciences, Yol. 5, p. 164; Iowa Geol. 
Sur., Yol. 8, p. 814. 
ttt Leaves entire. 
Quercus imbricaria Mx., Hist. Chen. Am., 9, PI. 15, 16, 
1801. Laurel Oak. Shingle Oak. Leaves lanceolate or 
oblong, entire, bristle-tipped, acute at both ends, 
short-petioled, glabrous above, persistently downy beneath; 
acorn subglobose; cup hemispheric, shallow, scales ovate- 
lanceolate, appressed. 
In Iowa this species is found only in the southern half 
of the state and in that portion it is common, forming 
much of the upland woods. Trees rarely exceed one or 
two feet in diameter. The wood is light reddish brown 
and coarse-grained. The wood is utilized for fuel, coal 
props, and to a very limited extent for local lumber. Our 
specimens are from Johnson, Washington, Decatur, Ring- 
gold, and Clarke counties. We have observed the species 
in Jefferson, Wapello, Appanoose, and Union counties. 
The State University has specimens from Henry, Des 
Moines, Yan Buren, and Taylor counties. Mr. Reppert 
reports the species from Muscatine county. 
