WILLOW FAMILY. 331 



2. P. monilif era. Ait. Leaves broadly deltoid, with spreading promi- 

 nent nerves, slightly heart-shaped or truncate at base ; scales lacerate 

 fringed, not hairy. 

 NECKLACE-BEARING POPLAR. Cotton-wood. 



Trunk 40 - 80 feet or more in height ; the young shoots slightly angled. Leaves 2-3 inches 

 long, and about the same width, serrate on the margin with cartilaginous, incurved and 

 slightly hairy teeth. Stigmas nearly sessile, very large and dilated. 



Margins of streams : especially Westward. April. 



Obs. This tree has a wide range, being found from the Atlantic to the 

 Pacific.- This and other species are popularly known as Cotton-woods, 

 and in many regions form almost the only timber. It gets its specific 

 name from the resemblance of the long amcrit of ripened fruit to a string 

 of beads or necklace. Another of the Cotton-woods of the West and 

 South is P. angulata, Alt., which has its branches acutely angled or 

 winged ; both this and the preceding bear very large heart-shaped leaves, 

 7-8 inches in length on the yourig plants and suckers, while on the old 

 trees they are only about one quarter that size and not often heart- 

 shaped at base. 



3. P. GR^'CA, Ait. Branches terete ; leaves cordate-ovate, acuminate, 

 obsoletely serrate, somewhat ciliate. 

 GRECIAN POPULUS. Athenian Poplar. 



Stem 30-50 feet high, and 1-2 feet in diameter, with irregular and rather spreading 

 branches. Leaves 4-6 or 8 inches in length, and as wide as long ; pdinles l%-3 inches 

 long, laterally compressed near the leaf. Pistillate aments 3-6 inches long. 



About houses : cultivated. Native of Greece. Fl. April. Fr. 



Obs. This species was introduced, as a shade tree, about 40 years ago ; 

 but it was not generally adopted, and is now nearly superseded by 

 more eligible ones. We have only the pistillate plant in this country ; 



FIG. 230. The Cotton-wood (Populus monilifera). 231. A fringed scale from a stamiuate 

 ament. 232. Portion of a fertile ament. 



