172 IOWA ACADEMY OF SCIENCES. 



from Fayette county; Professor Macbride from Humboldt 

 county; Professor Pammel from Hardin county; and 

 Messrs. Nagel and Haupt from Scott county. Bet u la alba 

 var. popuUfolia Winchell, in Ludlow's Rep. Black Hills, 67, 

 not Spach, is a synonym, and is the name given by Profes- 

 sor Bessey for this species in his contributions to the Flora 

 of Iowa. 



Bessey, Contr. to the Flora of Iowa, p. 119; Arthur, 

 Contr. to the Flora of Iowa, p. 29; Nagel and Haupt, Proc. 

 Davenport Acad, of Nat. Sciences, Vol. 1, p. 163; Pammel, 

 Proc. Iowa Acad, of Sciences, Vol. 1, pt. 2, 1890-1891, p. 

 91; Iowa Geol. Sur., Vol. 10, p. 312; Fink, Proc. Iowa 

 Acad, of Sciences, Vol. 4, p. 101; Cameron, Iowa Geol. Sur., 

 Vol. 8, p. 198; Macbride, Iowa Geol. Sur., Vol. 4, p. 119; 

 Vol. 10, p. 646; Fitzpatrick, Proc. Iowa Acad, of Sciences, 

 Vol. 5, p. 127. 



Betula lenta L. Sp. PI. 983, 1753. Cherry Birch. A tree 

 much resembling the cherry, growing forty to sixty feet or 

 more high, with dark brown, smooth bark, which becomes 

 furrowed, but does not separate in layers like our other 

 species, and ovate or ovate-oblong, acute or acuminate, 

 sharply serrulate, short-petioled leaves. Pistillate aments 

 sessile, at the ends of short branches, oblong, proportion- 

 ately thick, dense. 



• The range for this species as given by Britton and Brown 

 is Newfoundland to western Ontario, Florida and Ten- 

 nessee. This places Iowa far west of the supposed range, 

 yet Professor Pammel reports the species from central 

 Iowa, the locality being Steamboat Rock, Hardin county. 

 He says: "Some large trees one foot in diameter occur in 

 moist woods below the sandstone ledges. Much of the 

 birch has been removed. This is very valuable wood and 

 is much used by cabinet makers. Its occurrence in central 

 Iowa is quite unusual." 



Pammel, Iowa Geol. Sur., Vol. 10, p. 312. 



Alnus incana (L.) Willd. Speckled or Hoary Alder. A 

 shrub, eight to twenty feet high, and about one foot or less 

 in diameter, with glabrous twigs, and pubescent shoots; 

 leaves ovate or oval, acute, usually whitened and downy 



