378 BOTANICAL GAZETTE [NOVEMBER 
based on a small collection of plants made by FRANK TweEEpy, of the U. S. Geo- 
logical Survey. His collections were made in the Big Horn Mountains, “between 
longitude 107° and 107° 30’ and latitude 44° 30’ and 44° 40’, chiefly on the head- 
waters of the east and west forks of Big Goose Creek and on the high divide 
between these streams and Shell Creek.” 
The original description and the accompanying data are as follows: 
“Teaves at first thinly overspread on the upper surface with floccose hairs, soon 
smooth and green both sides; capsules glabrous. In bogs and along mountain streams, 
altitude 2,460 to 3,080™ (8,000 to 10,000%). Head of Big Goose Creek, Big Horn 
Mountains, July 15 (nos. 11 and 12).” 
Bess, after noting the original and few subsequent collections of the rare 
Salix Barrattiana and remarking on its silky leaves and capsules, continues: 
“That there should be more or less variation in this vesture was to be expected 
from what is known of the two most nearly allied species. S. Hookeriana was first 
described as having ‘very smooth’ capsules, but subsequent observations have shown 
that they are more frequently tomentose, and a like variation, though in less degree, 
prevails in the case of S. Richardsoni; but in neither is this variation so pronounced as 
to lessen the surprise with which we find the one species of the group heretofore most 
conspicuous for its silky vesture, appearing, as in Mr. TwEEDy’s specimens, SO , 
glabrate. The leaves, and in fact the aments as well, bear a very close and deceptive 
resemblance to some forms of S. Barclayi; but the aments are closely sessile, terminal 
as well as lateral, the styles longer and the stigmas bifid; the leaves alone could scare=ly 
be distinguished one from the other.” 
_A study of the type material and of later collections leaves no doubt that this 
willow is specifically distinct from S. Barrattiana. Not only do the nearly gle 
brous leaves and the glabrous capsules serve to distinguish it, but the leaf margin 
thickly set with conspicuous glands is a marked character. _ : 
The varietal name proposed by BEBB was “‘denudata,” but as this was pre- 
occupied by S. commutata denudata Bebb (1888) Rose substituted the orm 
“Tweedyi” and credited it to BeBB, whose name appears in the text 2 ni 
author. CocKERELL has since contended? that Rose and not BEBB ae 
considered the author of the variety. This view, however, cannot be 
Salix Wolfii Idahoensis, n. var—lLeaves usually densely a 
with shining hairs, giving a decided luster to the surface, scarcely a 
ing in drying: capsules 3-4™™ long, thinly but permanently silky pu 
cent; style about 1™™ long. . pe 
wstone National Park, n0- 5655 Pik, 
Valley, Yellowstone National 
1888. : nie 
Montana: Madison Cafion, J. M. Coulter, Hayden Survey, 1872. ane 
men so labelled in the U* S. National Herbarium (accession no. 25 3,723) bears 
label, ‘Madison Cafion, Idaho Ter.,’”? which must certainly be an 
Wyominc: Mammoth Hot Springs, Yello 
» 
2 Bot. GAZETTE 22: 268. 18096. 
