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 Vol. 8, p. 314, 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 mayylandica 

 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, Vol. 5, p. 164; Iowa Cleol. 

 Sur., Vol. 8, p. 314. 



ttt Leaves entire. 



Quercus imhricaria 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 w^ood 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, Van Buren, and Taylor counties. Mr. Reppert 

 reports the species from Muscatine county. 



