122 Proccediui^^s of the Ohio Slufc .Icadciiiy of Science 



1. Juniperus communis L. LnmiiKjii Juniper. .\ low- 

 tree with spreading or drooping branches and shreddy bark. 

 Goats are poisoned from eating the leaves. On dry hills. X. S. 

 to Br. Col. south to X. J., Ohio. Mich., Xeb., and in the Rocky 

 ]\Its. to X. ^lex. Also in Europe and Asia. 



2. Juniperus virginiana L. Red Juniper. A tree, with 

 spreading often irregular branches when old, but conic in shape 

 when }()ung. Self-prunes twigs. Wood very valuable, light. 

 straight-grained, durable, and fragrant ; used for posts, cabinet- 

 work, interior finish, veneers and cooperage, and almost exclu- 

 sively in the manufacture of lead pencils. Often infested with 

 the "cedar-apple." Poisonous to goats. In dry soil; common on 

 bluffs. X. B. to Br. Col., Fla.. Tex., and Ariz. Also in W. I.. 

 Ohio. 



Subkingdom, AXCKJSl 'ERAIAE. Angiosperms. 

 Class, DicoTYLAE. Dicotyls. 

 Subclass, Apetalae. 

 Order, Salicales. 



Salicaceae. Willow^ Family. 

 II. Populus L. Poplar. 



Trees with scalv resinous buds. Flowers in aments ; fruit 

 a capsule; seeds with lung cottony hairs. Leaves mostly with 2 

 or more glands at or near the base of the blade and with gland- 

 tipped teeth. • Twigs prf)mint'ntly self-pruned by means of cleav- 

 age planes in basal joints. Pith 5-angle(l. 



1. Leaves and twigs persistently and densely white tomentose below, 

 usually lobed ; self-prnning scars very prominent on the small 

 twigs. P. alba. 



1. Leaves and twigs glabrous or nearly so when old, not lobed. 2. 



2. Petioles terete or channeled, not much flattened laterally; leaves 



crenate. 3. 



2. Petioles strongly Battened laterally. 4. 



3. Leaves densely tomentose when young; capsule slender-pedicelled. 



P. Iictcropliylla. 



3. Leaves not tomentose but usually somewhat puliesccnt ; capsule short- 



pedicelled. P. balsaiiiifcra. 



4. Leaves broadly deltoid, abruptly acuminate; terminal winter buds 



usuallv angular. 5. 



