1918] SCHNEIDER—AMERICAN WILLOWS 333 
rather far advanced leaves, the largest of which measure up to 4 cm. 
in length and 12 mm. in width. They are narrowly elliptical, acute 
at both ends, finely puberulous on the midrib and on some of the 
veins above, and glaucescent and almost wholly glabrous beneath, 
with an entire, ciliated margin. To the true S. desertorum may also 
belong (at least partly) the following 2 specimens collected by 
J. W. Tyrutt: Hudson Bay, west of Chesterfield Inlet, Septem- 
ber 2, 1893 (no. 1711 O., f., fr.), and between Lake Athabaska and 
Chesterfield Inlet, July-August 1893 (no. 1712 O., m., f.). Both 
numbers consist of several small pieces apparently taken from 
different plants, and it is impossible to judge them properly. 
I think it best to give the following description of the type 
material, because I shall not be able to insert S. desertorum into the 
key. Frutex erectus sesquipedalis (fide RicHarpson), habitu ut 
videtur S. pseudolapponum non absimilis; ramuli novelli satis dense, 
rarius laxius albo-sericeo-villosi, hornotini paullo glabrescentes, 
annotini subglabriores vel tantum partim pilosi, brunnescentes vel 
interdum ut vetustiores vulgo nondum perfecte glabri purpura- 
scentes et nitiduli, adulti flavo-brunnei, epidermide griseo secedente 
obtecti; rami cinereo-badii vel nigrescentes; folia speciminum typi- 
corum valde juvenilia vel vix semi-evoluta membranacea, elliptico- 
lanceolata vel obovato-lanceolata (ex auctore “‘exacte elliptica’’), 
apice obtusa vel vulgo pl. m. acuta, basi subito vel sensim in 
petiolum angustata, superiora integerrima vel tantum versus basim 
parce et obsolete denticulata, infima fere circumcirca tenuiter 
glanduloso-subdenticulata, maxime evoluta ad 3:0.9 cm. magna; 
superne ab initio glabra vel sparse (ad costam densius) villosula, in 
sicco subnigrescentia, valde indistincte subinciso-nervata et reticu- 
lata, stomatibus (an semper ?) instructa, subtus pl. m. discoloria, 
glaucescentia, pruinosa, magis (saltem inferiora) sericeo-villosa sed 
cito satis glabrescentia pilis adpressis difficile recognoscentibus 
(tardius evoluta ut videtur distinctius pilosa); petioli nondum 
satis evoluti, vix ad 5 mm. longi, laxe sericei; stipulae nullae vel 
vulgo pl.m. evolutae, minimae vel parvae, maximae lanceolatae, 
glanduloso-denticulatae, parce pilosae, petiolis circ. }— 2 breviores; 
amenta coetanea vel subserotina, cylindrica, ramulos breves foliatos 
sub anthesi vix ad 1 cm. longos terminantia, rhachide villosa; 
