380 BOTANICAL GAZETTE [NOVEMBER 
July 9, 1873; Beaver Creek, Larimer Co., roadsides in pine woods, no. 1440, L. N. 
a July 4, 
MING: Ciacanial Valley, no. 1754, Aven Nelson, August 18, 1895; Cen- 
ae Means Co., bogs, no. 8822, Aven N sen, August 7, 1902; Laramie Peak 
Albany Co., aed the creek, in clumps, 4-10 high, no. 7580 (type), Aven Nelson, 
July 13, 1900; head of Big Goose Creek, Big Horn Mountains, no. 47, Frank Tweedy, 
July aah 893. 
RTA: Banff, low ground, side of road to uate Head hake, alt. 4500", 
no. W. C. McCalla, June 8 and August, 1 
This beautiful willow is found at high cee in the mountains of Colorado 
and northward. It is most closely related to S. chlorophylla Anderss. and the 
pistillate aments closely resemble those of that species. It is readily distinguished 
by the oblanceolate leaves which, when mature, are prominently nerved above 
and reticulated beneath. Authentic staminate material has not been seen. 
I take pleasure in dedicating this species to Professor AVEN NELsoy, of the 
Rocky Mountain Herbarium, who has made available so much valuable material 
in this difficult genus—CarteTon R. Batt, U.S. Department of Agriculture, 
Washington, D. C. - 
EXPLANATION OF PLATES XII AND XIII. 
PLATE XI. 
Figs. 1 and 2. S. Gooddingi Ball; fig. 1, fruiting branch, natural size; fig. 2, 
capsule and scale. x ro. 
Fics. 3-7. S. Tweedyi (Bebb) Ball. Fig. 3, sterile twig; jig. 4, pistillate 
ament; fig. 5, mature leaf showing stipule and bud; fig. 6, capsule (x10); fs: 
7, Outline of margin of young leaf showing glands. X10. 
PLATE Xill, 
Fics. 8-11. S. Nelsoni Ball; Fig. 8, Sterile twig, from type; ig. a fruiting 
branch; fig. 0, elliptical apical leaf; jig. 11, capsule, X10. 
