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. Betula alba 
var. populifolia 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, Yol. 1, p. 16B; Pammel, 
Proc. Iowa Acad, of Sciences, Yol. 1, pt. 2, 1890-1891, p. 
91; Iowa Geol. Sur., Yol. 10, p. 812; Fink, Proc. Iowa 
Acad, of Sciences, Yol. 4, p. 101; Cameron, Iowa Geol. Sur., 
Yol. 8, p. 198; Macbride, Iowa Geol. Sur., Yol. 4, p. 119; 
Yol. 10, p. 646; Fitzpatrick, Proc. Iowa Acad, of Sciences, 
Yol. 5, p. 127. 
Betula lenta L. Sp. PI. 988, 1758. 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., Yol. 10, p. 812. 
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 
