284 PEACTICAL FOEESTEY, 



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

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

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

 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 angnstifoliiun, Gray. — ^A genus closely related to the 

 Larrea and Guiaeum, and found along the boimdary between 

 Mexico and the TJnited 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. 



Pt«lea trifollata, 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 aUantus. Grenerally a large shrub, but occa- 

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

 sin, and Southward to Florida. 



