268 WOODY PLANTS OF MASSACHUSETTS. 



England. Sir W. J. Hooker says it is one of the most generally 

 diffused of all the willows in British North America, being found 

 throughout Canada, from Lake Huron to the Saskatchawan 

 and Jasper's Lake in the Rocky Mountains, and to the Colum- 

 bia River, and as far north as Fort Franklin on the Mackenzie 

 River. It occurs as far south as Chester County, Pennsylvania. 

 It has a near resemblance to S. pentandra, of Europe, but 

 the leaves differ in having a much longer acumination, and in 

 having their serratures less glandular, and the male aments and 

 their footstalks are much shorter. 



Group Sixth. The White Willows. Alba. Borrer. 



Trees of the largest size, having lanceolate, serrated leaves, 

 with glandular serratures, long appressed, silky hairs beneath, 

 and often above, giving to the foliage a whitish or bluish hue. 

 Flowers loosely disposed in the catkins ; stamens two ; ovaries 

 smooth. — Hooker, Eng. FL, 418. 



Sp. 13. The White Willow. & alba. L. Introduced. 



Figured in Sowerby's English Botany, 2430. The tree in Loudon, Arb., 



VII, 209. 



Leaves elliptic-lanceolate, regularly glandular-serrate, acute, silky beneath, 

 often above ; ovaries ovate-acuminate, nearly sessile, smooth ; stigmas short, 

 recurved, deeply cleft ; stamens two, with hairy filaments ; scales short, pu- 

 bescent at the margin. — Hooker' s Eng. FL, p. 418. 



" A native of Europe, from Norway and Sweden to the Med- 

 iterranean^Sea ; of the north-east and west of Asia ; near all 

 the large rivers of Russia and Livonia, especially the Irtish, 

 where it attains the height of a large tree." — Loudon, 1523. It 

 has long been more extensively planted throughout Britain, as 

 a timber tree, than any other species. It grows rapidly, often 

 to the height of thirty feet in ten years, and, in favorable situa- 

 tions, attains an elevation of even eighty feet and upwards. It 

 has been extensively planted in various parts of the Continent 

 of Europe, particularly in Russia, on the road from Moscow to 

 the Austrian frontier. 



It has also been introduced and extensively planted in this 



