120 Proceedings of the Ohio State Academy of Science 



obtuse, or merely mucronate, ^-^ in. long. In swamps and bogs. 

 Vt. to Ont., N. Y., and Mich. 



*. Picea excelsa (Lam.) Link. Norway Spruce. A large 

 tree, conical in shape when young, with numerous stout spreading 

 and drooping branches. Abundant in cultivation. Source of 

 Burgundy pitch. 



5. Tsuga Carr. Hemlock. 



Evergreen trees with slender horizontal or drooping 

 branches. Leaves flat, narrowly linear, spreading more or less 

 into 2 ranks. Leaf scars on short sterigmata. Carpellate cones 

 pendulous. 



1. Tsuga canadensis (L.) Carr. Hemlock. A tall tree 

 with slender, horizontal or drooping branches, the old bark flaky 

 in scales. Wood very coarse, light and soft; used for wood pulp. 

 Bark used for tanning. Source of Canada pitch. Self-prunes 

 twigs. N. S. to Minn, south to Ohio, and Del, along the Alle- 

 ghanies to Ala., and to Mich, and Wis. 



6. Abies Juss. Fir. 



Evergreen trees with flat linear leaves. No sterigmata on 

 the twigs but with ordinary circular or oval leaf scars. Carpel- 

 late cones erect. 



1. Carpellate bract serrulate, shorter than the ovuliferous scale; leaves 



obtuse. A. balsamea. 

 1. Carpellate bract aristate, longer than the ovuliferous scale; leaves 



mostly emarginate. A. fraseri. 



J. Abies balsamea (L.) Mill. Balsam Fir. A slender 

 short-lived tree. Wood very light and soft. Canada balsam is 

 obtained from its resin. Newf. to N. W. Terr., south to Penn., 

 along the Alleghanies to Va., and to Alich. and Minn. 



2. Abies fraseri (Pursh) Lindl. Eraser Fir. A slender 

 tree growing on the high Alleghanies. W. Va., N. Car., and 

 Tenn. 



