NOTES ON AMERICAN WILLOWS 
II. THE SPECIES RELATED TO SALIX GLAUCA L. 
CAMILLO SCHNEIDER 
In my first paper’ I dealt with Salix arctica Pall. and its relatives. 
These species are mostly united with S. glauca L. and its congeners 
in one group or section by such American salicologists as P. A. 
RypBerc and C. R. Baxi. European students of willows like 
N. J. Anpersson, A. and E.-G. Camus, and O. v. SEEMEN referred 
the two species to different sections, and I have always thought it 
best to regard each species as a representative of a distinct group. 
It is not an easy task to draw a line between the forms of the 
GLAucaE on the one hand and those of the arctica group on the 
other, but this is true of most of the sections in a genus like Salix, 
where it is difficult to define groups of closely related species. As 
I have already explained in SarcEnt, Pl. Wils. 3:136. 1916, the 
name ARCTICAE is not available to designate the group of which 
S. arctica Pall. is the type, because it was first used by ANDERSSON 
(1858) for a section containing S. Hookeriana Barr., S. speciosa 
Hook. and Arn., non Host. (S. alaxensis Cov.), etc., which in 1868 
ANDERSSON included in his sect. NIvEAE B. VrttosaE; therefore 
I (I.c. 140) proposed the name DretopictyaeE for this group, but at 
this time I also kept the OvatiroLtar of RYDBERG as a separate 
unit, expressing, however, a doubt “whether the species united by 
RypBERG in this section really belong in the same group.” At 
present I believe that S. ovalifolia should be placed in the same 
section with S. arctica, and consequently the name OVALIFOLIAE 
must be adopted for this group. To distinguish between those two 
sections the color and pubescence of the bracts (or scales) seems 
to afford a rather reliable character. In the OvALIFOLIAE the bracts 
are usually more or less bicolor, being pale at base and dark brown, 
fuscous, or even blackish toward the apex, while the forms of the 
GLAUCAE mostly have uniformly yellowish, light brown, or straw- 
colored bracts, which sometimes (especially in the upper part of 
* Bot. Gaz. 117-142. 1918. 
Botanical Gazette, vol. 66] [338 
