1905] BRIEFER ARTICLES 379 
Madison Cafion explored by the Hayden Survey in 1872 is in Montana, not far from 
the boundary of the Yellowstone Park. This specimen was probably listed under 
the name of Salix glauca L., which is credited by CouLTER in his list3 to the “ Upper 
cafion of the Madison.”’ S. Wolfii is, of course, not mentioned, because it was not 
published until six years later, in 1878. 
Ipano: Forks of Wood River, alt. 6000 (1800™), no. 3399 (type), L. F. 
Henderson, July 25, 1895. 
REGON: Banks of Wallowa River, mouth of Hurricane Creek, no. 2400, W. C. 
Cusick, June 11, 1900. 
The relationships of this little willow are all with S. Woljfii Bebb, from the 
typical form of which it differs mainly in the silky-pubescent capsule and the 
rather more silky leaves. The different specimens show considerable variation 
in the amount of pubescence on the capsules. In general, the specimens 
the more northwestern localities show the denser pubescence, both on leaves and 
capsules. In some cases they tend toward a glabrate condition in age. In S. 
Wolfii the capsules are glabrous even when young. This variety is found from 
the Yellowstone Park northwestward across Montana and Idaho to eastern 
n. The species is found from central Colorado to Montana and Idaho. 
Salix Nelsoni, n. sp—A shrub, 1.2-3™ high, freely branching, very 
leafy; twigs shining, the older gray with a reddish tinge, the younger 
bright chestnut or darker, and often drying dark: buds large, smooth, 
chestnut, 7-9™™ Jong, beaked: leaves ‘petioled, petioles 3-7™™ long, 
smooth; stipules none; blades oblanceolate or rarely narrowly lanceolate, 
acute at both ends, cuneate at the base, 8-15™™ wide, 3-5-5°™ long, entire 
(except as noted below), the margin somewhat involute, especially toward 
- base; glabrous, or thinly silky villous when young, green and tee 
shining above, pale and somewhat glaucous below; primary veins promi- 
nent, usually elevated and rather greenish-yellow on the upper surface, 
prominently reticulate below by the elevation of both primaries and wee 
ondaries;s apical and subapical leaves on sterile shoots narrowly elliptical, 
a5 margin shallowly glandular crenate-serrate: pistillate aments sessile 
with sometimes a few small foliaceous bracts at the base, spreading, slender 
ind cylindrical when young, very much thickened in fruit, 1-5-3 mee 
“psules silky pubescent, sessile, 5-6™™ Jong; styles entire or rarely bifid, 
ayes" long; stigmas smooth, 0.7-1.0™™ long, dark; scales dark, 
*vate, acute, clothed on both sides with long white hairs: staminate aments 
hot seen.— Plate XIII , figs. 8-11. 
he “oem Little Fountain Creek (south of Pike’s Peak), ~ — pet 
‘iimer, September 5, 1903; Mt. Lincoln, Park Co., alt. 12,000 J.M. , 
*Ann. Rept. U. S, Geol. Surv. Terr. 6:782. 1873- 
‘ead type the primaries and sometimes also the secondarie 
Which ; ery broad and deep green in color, giving 4 strikingly 
'S Not so evident in other specimens. 
gs on the upper 
beautiful effect, 
