Two new willows from the Canadian Rocky Mountains * 
WILLARD WINFIELD ROWLEE 
During the summer of 1899, Mr. W. C. McCalla spent several 
months exploring and collecting in the vicinity of Banff, Alberta. 
At the writer’s suggestion he made a special effort to secure a set 
of willows of the region, in which the stages of development 
would be shown. Usually collectors have too little time at their 
disposal to label or otherwise mark individuals in the field and 
then to go over the ground a second or third time and supplement 
their first collection, a method very essential in making specimens 
of Salix. Mr. McCalla not only did this but was also well equipped 
by natural aptitude and previous study to carry on a thorough in- 
vestigation of the flora. The result of his work was an admirable 
and valuable set of plants from a region heretofore imperfectly 
know. Mr. Ball has already recognized, among McCalla’s willows, 
specimens representing his new species, Salix wyomingensts. Two 
other specimens appear to represent new species of Salix. 
Salix albertana sp. nov. 
Low stout shrub; shoots of current and preceding year dark- 
brown, covered with sparse cobweb-like pubescence, roughened by 
the leaf-scars and the more or less persistent scales ; buds small, 
brown ; leaves broadly elliptic-lanceolate, tapering equally to both 
ends, minutely glandular-serrulate or entire, clothed both sides 
with dense appressed silky tomentum when young, becoming less 
so with age, markedly opaque, petiole stout, 0.5-0.75 cm. long, 
blade 6-7 cm. long, the broadest 2.5 cm. wide, midrib and primaries 
prominent, ultimate veins distinctly reticulate ; stipules large, the 
largest 0.75 cm. long, and 0.5 cm. wide, obscurely glandular den- 
ticulate, semi-persistent ; aments large, sessile, terminal, usually in 
pairs, appearing before the leaves, silky and densely flowered ; pis- 
tillate cylindrical, 5-6 cm. long, 1.5 cm. thick, remaining dense at 
maturity ; scale black, nearly equaling the ovary at anthesis, ellip- 
tic, obtuse, clothed on the back and margins with long silky hairs ; 
capsule lanceolate, silky-pubescent, sessile, tapering into the long 
by, Contribution No. 122 from the Botanical Department of Cornell University. 
157 
