1918] SCHNEIDER—AMERICAN WILLOWS 137 
distinguished by its foliis utrinque acutioribus apice subacuminatis 
superioribus superne (saltem in parte) satis villosis, subtus vulgo 
glabris ad 3.5:1.3 cm. magnis, amentis femineis (immaturis) inter- 
dum ad 6:1.3 cm. magnis basi valde laxifloris longe pedunculatis. 
The most extreme form of this variety has been collected by Hail 
and Chandler on Mount Goddard, Fresno County, California, July 
24-26, 1900 (no. 685, m., f.; G.); and I refer to it also a specimen 
collected by F. W. Congdon on Mount Dana, Mono County, Cali- 
fornia, August 27, 1895 (m., fr.; N.). 
It may be mentioned here that S. cascadensis Cock. (S. tenera 
And., non A. Br.) is regarded as very closely related to petrophila 
by RypBER«, or as ‘‘perhaps only a variety”’ of it by Batt. I pre- 
fer to place it in a different group next to S. phlebophylla, and 1 
shall speak of it later. 
There are three more willows, which, in my opinion, should be. 
included in the same group with S. arctica, namely S. stolonifera 
Cov., S. ovalifolia Trautv., and S. groenlandica Ldstr. The first 
two have been well treated by CovittE (1901), and need only a few 
remarks, while the history and taxonomy of the last ought to be 
explained in detail. 
4. S. STOLONIFERA Coville, in Proc. Wash. Acad. Sci. 3:333. 
pl. 41. fig. 1 (Willows of Alaska). 1901, “is a species of eastern 
Alaska, in the glacier region from Yakutat Bay to Glacier Bay and. 
Lynn Canal.” RypsBeErc (1899) mentioned this species under the 
name of S. unalaschensis ‘‘Cham. Linnaea 6:539."’ As COVILLE 
has explained, CHamisso did not propose such a species, but merely 
describes a “‘Salix unalaschcensis, multis cum arctica Pall. conve- 
niens, pluribus ab illa abhorrens, nulli nostrarum propius accedens,” 
to which he did not give a specific name. His form from Unalaska 
is the same as S. ovalifolia Trvt., and ANDERSSON has already 
mentioned in the Prodromus “‘S. unalaschkensis Chamisso”’ among 
the synonyms of TRAUTVETTER’S species. CovILLE describes the 
Ovaries as ‘‘smooth or with some traces of pubescence toward the 
apex,” and he regards the glabrous form as the typical and com- 
mon one. I think it best to propose a f. subpilosa, f. nov., fructibus 
pl. m. interdum satis dense pilosis, because such forms resemble 
somewhat S. arctica, especially when the old fruits have lost the 
