iqiq] SCHNEIDER— AMERICAN WILLOWS 341 



2:66. pi. 5. fig. 6. 1806; Carey in Gray, Man. Bot. N.U.S. 429. 

 1848; Andersson in K. Sv. Vet.-Akad. Handl. 6:54. pi. 4. fig. 35. 

 1867, pro parte et excl. var.; in DC, Prodr. 16^:214. 1868, pro 

 parte et excl. var.; Bebb in Coult., Man. Bot. R. Mts. 335. 1885, 

 pro parte; apud Watson and Coulter, Gray Man. ed. 6. 482. 1890; 

 Robinson and Fernald, Gray's New Man. 323. fig. 64Q. 1908. — 

 S.fluviatilis Sargent in Gard. and For. 8:463. 1895, pro parte, non 

 Nutt.; Silva N. Am. 9:123. pi. 4^4. 1896, pro parte et excl. var.; 

 Man. Trees N. Am. 175. 1905, pro parte; Schneider, 111. Handb. 

 Laubh. I. 32, figs. 11 h~l, 12 m-m\ 1904; Ball in Proc. Iowa Ac. 

 Sci. 7:145. 1900; in Coult. and Nels., N. Man. R. Mts. Bot. 131. 

 1909, pro parte; in Box. Gaz. 60:397. 191 5; Britt. and Brown, 

 111. Fl. 1:497./^. iiSi. 1896; Sudworth, Nomencl. Arb. Fl. U.S. 

 122. 1897, pro parte; Rydberg in Britt., Man. Fl. N. St. Can. 316. 

 1901; Hough, Handb. Trees N. St. Can. S4. figs, gy, g8. 1907, pro 

 parte maxima. — S. interior Rowlee in Bull. Torr. Bot. Club 27:253. 

 pi. 9, figs. 12, I J. 1900; Small, Fl. S.E.U.S. 342. 1903, pro parte; 

 Britt. and Shafer, N. Am. Trees 193. fig. 1^4. 1908; Britt. and 

 Brown, 111. Fl. ed. 2. 1:595./^. 1458. 1913; Rydberg, Fl. R. Mts. 

 192. 191 7. — This is the type species of the section and the only one 

 known from the central and northeastern states and eastern Canada. 

 The type came from Lancaster, Pennsylvania. It has its head- 

 quarters in the regions of the Mississippi, Arkansas, and Missouri, 

 while toward the east the Ohio seems to form the southern border 

 hne of its range up to Pennsylvania. The mouth of the Mississippi 

 in Louisiana is the southernmost point of the range of S. longifolia; 

 its western boundary runs apparently just south of the Red River 

 in Louisiana and Texas, thence through western Kansas, the north- 

 eastern corner of Colorado, touching Wyoming in its northeastern 

 part, from whence it runs through western Dakota to Manitoba. 

 In Texas, southern New Mexico, and northwestern Mexico it is 

 represented by var. angustissima (see later), while in the northwest 

 from western Dakota and northeastern Wyoming through eastern 

 Montana, Saskatchewan, and eastern Alberta the var. pedicellata 

 seems to be the prevailing form, reaching its northwestern limit 

 in the Yukon Valley (vicinity of Dawson and the adjacent parts of 

 eastern Alaska, Fairbanks) and the upper Mackenzie region in the 



