75 
SLENDER WILLOW. 
SALIX exigtja, foliis linearibus utrinque acutis subinteger- 
rimis sericeis, stipulis nullis, amends serotinis elongads, 
capsulis lanceolads sessilibus, demum nudiusculis. 
This species is also a native of the territory of 
Oregon, and grew with the preceding, which it strongly 
resembles: it is, however, a smaller species, with still 
narrower leaves, at all times more or less grey and 
silky, the serrulations are mostly wanting, though very 
minute ones are sometimes seen: the capsules are 
smaller, and not pedicellated. The male plant I have 
not seen. The branches are reddish brown and smooth. 
ROUND LEAVED WILLOW. 
SALIX r o t ti n d i f o l ia , yo /m subrotundis ovatisve minutissime 
serrulads vel integriusculis utrinque glabris concoloribus, 
peliolis ramulisque pilosis, stipulis maximis dilatato-cor- 
dads membranaceis glanduloso-serrads, amends coaetaneis 
diandris lanuginosis, capsulis glabris lanceolads, stylis 
elongads. 
ovata, foliis ovatis acutis dense serrulads. 
This dwarf and remarkable species of Willow, at- 
taining about two feet in height, was obtained in the 
gorge of a lofty alpine ravine, through which we fruit- 
lessly endeavoured to pass. It was in the month of 
July, and the perpetual snows which still covered the 
mountains, mingled their outline with the skies. On the 
