284 PRACTICAL FORESTRY. 



inch and a half long, on short stalks. Flowers velvety, on short 

 steins. A large shrub, but sometimes twenty feet high. Wy- 

 oming Territory, Utah, New Mexico, and in the Coast Ranges 

 of California. 



Fraxinns qnadrangnlata, Michx. Blue Ash. Leaflets five to 

 nine, oblong-ovate or oblong-pointed, sharply serrate, downy 

 beneath when young, becoming smooth when mature. Branch- 

 lets square. Seeds linear-oblong, blunt at both ends and winged 

 all round. A large tree, sixty to eighty feet high, with a wide 

 spreading top, and leaves large, sometimes eighteen inches 

 long. Wood similar to that of the White Ash, and excellent. 

 Moist, rich woods, in the Middle and Western States. 



Porleria angnstifolinm, Gray. A genus closely related to the 

 Larrea and Guiacum, and found along the boundary between 

 Mexico and the United States, from Southern Texas to Cali- 

 fornia, on the dry plains. It is a small tree, with hard and 

 heavy wood with a brownish color. It has a local reputation as 

 a medicine for certain diseases of the urinal organs. 



Ptelea trifoliata, Linn. Hop-Tree. Leaflets ovate -pointed, 

 downy when young. Fruit a two-celled and two-seeded 

 samara-winged all round, resembling an exaggerated elm seed. 

 They contain a bitter principle, and have been used as a substi- 

 tute for hops, hence the common name. It is closely allied to 

 the common ailantus. Generally a large shrub, but occa- 

 sionally a tree twenty-five feet high. Pennsylvania, Wiscon- 

 sin, and Southward to Florida. 



