RIVER WILLOW. 
73 
the Oregon. It bears a strong resemblance to the last, 
without however being any way intimately allied to it. 
It forms a slender bush, remarkable for its white and 
silvery pubescence, which appears as soft and glossy 
as velvet, the twigs are also pubescent. The leaves 
are two to three inches long, two or three lines wide, 
distinctly serrulated and nearly sessile, with the veins 
conspicuous through the pubescence. The female cat- 
kins, with their peduncles, are three or four inches in 
length, the capsules are nearly sessile, and at length but 
slightly pubescent. In this species there are distinct 
stipules on the young branches. 
RIVER WILLOW. 
SALIX fluviatilis; foliis linearibus utrinque acuminatis , 
sublanceolatis spinuloso-serratis demurn glabris concolori- 
bus, stipulis nullis, amentis serotinis pedunculatis villosis 
diandris, squamis oblongis, fructibus lanceolatis glabris 
pedicellatis, stigmatibus sessilibus. 
This species lines the immediate border of the 
Oregon, a little below its confluence with the Wahlamet, 
attaining the height of about six feet or more. We 
believe this is also the same Willow that we mistook 
for the Long-leaved species of Pursh and Muhlenberg, 
( Salix longifolia,) which so commonly lines the banks of 
the Missouri and Mississippi, and which often forms the 
exclusive growth of the small islands and sandbars, 
preparing these wastes, recovered from the flood, for a 
superior growth of trees, and they are also accompa- 
nied and succeeded commonly by the Cotton-wood, 
( Populus canadensis.) We met with this species like- 
10 
