Tin Trux of Texas 55 



1. POPULUS L. The Poplars. 



Large, rapidly growing forest trees with large, scaly, resin- 

 ous buds: pale, furrowed bark ; alternate, toothed or lobed 

 leaves, and flowers borne in catkins. 



Petiole of leaf round, scarcely or not at all flattened 

 laterally, buds cottony, leaves more or less 



lobed 1. P. alba. 



Petiole of leaf flattened laterally, leaves with mar- 

 gins notched or toothed, but not lobed. 

 Leaves broadly deltoid, abruptly sharp pointed at 

 the apex. 

 Leaf blades for the most of the leave* longer 



than broad 2. P. deltoides. 



Leaf blades mostly broader than long. 



Leaves truncate and slightly cordate at 



base with many small teeth 3. P. Fremontii. 



Leaves more or less cuneately narrowed on 

 the petiole with few teeth which are 

 relatively larger than the preceding. . . 4. P. Wislizeni. 



1. Populus alba L. "\Yhite Poplar. Silver-leaf Poplar. A 

 large tree with height of 100 and trunk diameter of 3 or fre- 

 quently much smaller, with numerous suckers developing from 

 the roots. Bark on young trees smooth, gray, or a greenish 

 white ; on old trees furrowed, gray or brown. Leaves ovate 

 or triangular, irregularly toothed, or 3-5 lobed, pointed, firm, 

 densely white, velvety, hairy beneath when young becoming 

 smoother with age. The leaf petiole is almost round, some- 

 times flattened somewhat laterally, shorter than the blade of 

 the leaf. 



Introduced from Europe. It is cultivated throughout a 

 large portion of the state for ornament. 



The silver poplar grows rapidly, is adapted to a wide range 

 of soils, is easily propagated and stands pruning w r ell. It is 

 planted in many localities as an ornamental tree, for which 

 purpose it is perhaps the most valuable of the poplars. 



2. Populus deltoides Marshall. Cottonwood. Carolina Pop- 

 lar. Necklace Poplar. A large tree 120 or more in height 

 and ()-8 in diameter, found principally along stream banks. 

 Hark gray with a greenish cast, thin and smooth on young 

 twius, and branches, thick *>nd fissured on old branches and 



