]28 Eleventh Annual Report 



4. Populus tremuSoides Michaux. Cottonwood. Quaking Asp. 

 Plate 22. Bark usually smooth, greenish-white or gray, turning an 

 ash color on age and on old trees becoming rougher or fissured and 

 much darker; twigs smooth or with a few hairs, reddish-brown, 

 shiny the first season, gradually turning gray; leaves 3-9 cm. (13^-4 

 inches) long; usually wider than long, dark green above, lighter 

 beneath, more or less pubescent when young, soon becoming gla- 

 brous, petioles flattened; catkins at first 3-7 cm. (1-3 inches) long, 

 the fertile gradually increasing in length to about 10 cm. (3 inches). 

 Usually a small tree, 30-45 feet high, and less than 3 dm. (12 inches) 

 in diameter. 



Distribution. Alaska and Hudson Bay south to the Ohio River 

 and along the mountains of Mexico. Found in all parts of Indiana, 

 becoming rare or infrequent towards the Ohio River. It is found 

 usually in colonies in open places about swamps, lakes and along 

 streams. 



The published records of the distribution are as follows: Clark 

 (Baird and Taylor) ; Dearborn (Collins) ; Decatur (Ballard) ; Dela- 

 ware (Phinney) ; Delaware, Jay, Randolph and Wayne (Phinney) ; 

 Fountain (Brown); Franklin (Meyncke); Gibson (Schneck); Ham- 

 ilton (Wilson); Jay (M'Caslin); Jefferson (Coulter); Knox (Ridg- 

 way); Kosciusko (Clark), (Scott) and (Youse); Marion (Wilson); 

 Miami (Gorby); Noble (Van Gorder) ; Posey (Schneck); Putnam 

 (MacDougal); Steuben (Bradner); Vigo (Blatchley). 



Additional records are: Putnam (Grimes); Tippecanoe (Coul- 

 ter); Allen, Lake, Laporte, Marshall, Porter, Steuben, Warren and 

 Wells (Deam). 



Economic uses. Not of sufficient size and abundance to be of 

 much economic importance. 



5. Populus deltoides Marshall. Cottonwood. Plate 23. Bark 

 on old trees ash colored, deeply furrowed; branchlets round or those 

 on vigorous trees angled, glabrous, yellowish-green becoming gray; 

 leaf blades 4-12 cm. (lJ^-5 inches) long, usually about as wide, 

 coarsely toothed, teeth glandular, incurved, lateral veins prominent 

 on both sides, petioles flattened; flowering season March, April or 

 May. 



Distribution. Quebec to Florida and west to the Rocky Moun- 

 tains. Frequent in low woods and along streams in all parts of 

 Indiana. The largest tree of the genus, usually 1-1.6 m. (3-5 feet) 

 in diameter. In the original forests it was one of the largest of 

 Indiana trees. 



