Nov., 1909.] The Gymnosperms of Ohio. n 



1. Pinus strobus L. White Pine. A large tree with nearly 

 smooth bark, except when old; branches horizontal, in whorls. 

 Often forming dense forests. Wood soft and straight-grained. 

 One of the most valuable timber trees in the world. Northeast- 

 ern part of Ohio to Erie County. 



2. Pinus virginiana Mill. Scrub Pine. A slender, usually 

 small tree with spreading or drooping branches; the old bark 

 flaky and dark-colored. Wood very resinous, soft and durable, 

 but of poor quality. In sandy soil. From Fairfield County 

 southward. 



3. Pinus echinata Mill. Yellow Pine. A large tree with 

 spreading branches; leaves sometimes in 3's. Wood rather 

 hard and very valuable ; much used as lumber. Produces shoots 

 from stumps. In sandy soil. Probably accidental in Ohio; 

 Auglaize County. 



4. Pinus rigida Mill. Pitch Pine. A tree with spreading 

 branches, the old bark rough and furrowed, flaky in strips. 

 Sprouts readily from the stump if cut down or burned. Wood 

 rather hard and brittle and full of resin; used for fuel, charcoal 

 and coarse lumber. A source of turpentine to a limited extent. 

 In dry sandy or rocky soil. Scioto, Jackson and Fairfield 

 Counties. 



Larix Adans. Larch. 



Tall pyramidal trees with horizontal or ascending branches 

 and with clusters of narrowly linear, deciduous leaves on thick 

 wart-like dwarf branches. Carpellate cones woody, with numer- 

 ous carpels, 



1. Larix laricina (DuR.) Koch. Tamarack. A slender tree 

 with close or at length scaly bark. Wood hard, durable and very 

 strong. Carpellate cones reddish purple when young. In bogs, 

 swamps, and about the margins of lakes. Northern third of 

 the state. 



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. Self-prunes twigs. Eastern half of 

 Ohio, and occasional toward the west. 



Juniperaceae. Juniper Family. 

 Leaf-buds naked; carpels of the cone few, opposite; stamens 

 with 3-8 microsporangia. 



Thuja L. Arborvitae. 

 Evergreen trees or shrubs with flattened fan-like twigs. Car- 

 pellate cones ovoid or oblong with dry coriaceous scales, not 

 peltate. 



