1919] SCHNEIDER— AMERICAN WILLOWS 59 



desire to express my gratitude to the curator of the U.S. Nat. 

 Herbarium. 



20. S. NiPHOCLADA Rydbg.— Having seen a co-type and other 

 material of this species from Herb. W., I wish to correct my state- 

 ments {I.e. 339) as follows: The co-type collected by Miss E. Taylor 

 has ripe fruits which measure up to 7 mm. in length and show a dis- 

 tinct pedicel (about 1.3 mm. long) which is distinctly longer than 

 the bifid gland. The male type described by Coville {Funston, no. 

 185) has short aments measuring about 10: 4-5 mm. and loosely 

 flowered at the base, but there is a specimen collected by F. C. 

 Schrader on the John River in northern Alaska, July 10, 1901, 

 of which the female part well agrees with the type of S. niphoclada, 

 while the male aments measure up to 22 : 4 mm., being very slender 

 and loosely flowered. In Funston's specimens the male flowers 

 are younger, but I hardly believe that they could grow to the size 

 of those of Schrader's plant. Otherwise the flowers are identical, 

 having glabrous filaments and ventral glands of a similar shape. 

 Schrader, however, collected another male specimen on Anak- 

 tuvuk River (erroneously spelled Ansktoobah River on the label) 

 August 5, 1 90 1, of which the aments are like those of the John River 

 plant, but the filaments are somewhat hairy at base. Otherwise 

 I cannot separate Schrader's plants, and I believe that the 

 pubescence of the filaments which mostly can be taken for a constant 

 character may not be of reliable taxonomic value in this case. We 

 need, of course, a better acquaintance with all the willows of this 

 region to decide the question whether or not the absence or presence 

 of a pubescence on the filaments is a really important character. A 

 fruiting specimen collected by Schrader at the same place and date 

 as the last mentioned male one seems to me inseparable from 5. 

 niphoclada, but the ripe fruits measure up to 8 mm. in length, are 

 almost sessile, and of a more ovoid-conical shape than in the type. 



The specimen mentioned {I.e. 339) from Fort Churchill, Hudson 

 Bay, collected by E. A. and A. E. Preble, is really no. 41, not no. 26 

 (as given by me and by Coville), according to a note by E. A. 

 Preble on the sheet (no. 385093) in Herb. W. From the same 

 place the same collectors brought a male specimen (no. 33; W.) 

 which I refer to 6". braehyearpa, which had been collected there 



