JOURNAL 



OF THE 



ARNOLD ARBORETUM 



Volume II OCTOBER. 1920 Number 2 



NOTES ON AMERICAN WILLOWS. X ' 



Camillo Schneider 



Before I can prepare a key and an enumeration of all the American W il- 

 lows I have to discuss several more species. Most of them may be referred 

 to the sections Fulvae and Roseae. Much doubt, however, exists as to 

 the systematic position and the real relationship of some species. 



group 1 ha 

 repeatedly 



Mr 



To-day I can only refer to what I said in the introduction to my last note 

 on the incompleteness of our present knowledge of most of the species and 

 varieties, and on the collections on which I have mainly based my studies. 

 All I can do here is to try to stimulate the interest in the study of Willows. 

 Investigations like those of Griggs » on the species of Ohio would greatly 

 help us, especially if careful attention is paid to the existing literature on 

 this subject. A critical review of the treatment of the genus given in such 

 books as Britton & Brown's Illustrated Flora, Britton's Manual, Gray's 



Manual 



be 



be 



terpret more correctly certain species, their relationship and variability. 



a. THE SPECIES OP SECTION FULVAE. 



This section was proposed by Barratt in 1840 for S. rostrata Richardson. 

 He gave a good description of its main characters, and said that it is 

 " nearer allied to some of the European, than any of the American Willows, 

 known to me." Andersson, in 1858 and later, placed the species of this 

 section in his section Cinerascentes vel Capreae, and I too, in 1904, referred 



1 Our attention lias been drawn by Trofessor J. C. Nelson to an error on p. 162 of vol. i of 

 this Journal in regard to CoviUe & Applegate's No. 551 of Salix commutaia which is enumer- 

 ated under the state of Wasliington, but should be referred to Oregon, the locality being near 

 the line between Lane County and Crook County or probably, after the subdivision of this 

 county, Deschutes County; the date should read August 17, not 7. ^ Ed. 



« Mr. Ball's study of the section Cordatae is expected to appear in the next issue of this 



Journal. ' ^ 



» Griggs, R. F. The Willows of Ohio. (Proc. Ohio State Acad. Sci. vi. pt. 6, pp. 60. 1905.} 



