Rowlee : North American Willows 251 



glabrous and brown : shoots very leafy, hoary puberulent : leaves 

 membranous in texture, elliptical, acute at both ends, 5-10 cm. 

 long, 1—2 cm. wide, closely sessile, obscurely and rather remotely 

 denticulate, hoary with rather long pubescence when young, gla- 

 brous at maturity, veins prominent : aments large, upon lateral 

 shoots 6-8 cm. long, .75-1 cm. thick, often three borne on a single 

 branch, very densely flowered, six to ten leaves on the peduncle, 

 flowering in July or late in June, scales oblong orobovate, rounded 

 or retuse at the apex, nearly or quite glabrous, narrower in the 

 pistillate ament, lower half of filaments very hairy, upper half mi- 

 nutely puberulent, capsule lanceolate, clothed with silky hairs when 

 young becoming nearly glabrous at maturity, closely sessile : style 

 evident : stigmas linear, several times longer than thick. 



Shorter and relatively broader leaves, glabrous scales, pubescent 

 capsule, evident style and linear stigmas are the distinguishing fea- 

 tures of this species. The name was first applied to plants col- 

 lected in the Columbia River valley. 



Oregon : Sand Bars, Columbia River (T. J. Howell), Multno- 

 mah Co. (T. J. Howell). 



6. Salix argophylla Nuttall, Sylva, 1 : 71. pi. 20. 1842 



Salix longifolia f var. argophylla Anderss. DC. Prod. 16 2 : 214. 



1868. 



Salix fluviatilis var. argophylla Sargent, Sylva, 9: 124. 1896. 



Salix Hindsiana Bentham, PI. Hartw. 335. 1857. 



Tree or large shrub usually 5 meters high forming dense 

 thickets but not growing in clumps, at any rate each bush distinct 

 so far as the parts above ground are concerned, young twigs 

 puberulent, branches nearly glabrous and exceedingly tough, bark 

 turning from brown to bright yellow or orange just before bloom- 

 ing making a thicket of it a most conspicuous object: leaves narrowly 

 lanceolate, 5 cm. long, 1—2 cm. wide, closely sessile, entirely or 

 rarely minutely and remotely denticulate, clothed equally on both 

 sides with an appressed silky pubescence which more or less con- 

 ceals the veins, stipules obsolete (rarely on very vigorous shoots 

 minute ones occur. Occasionally the leaves remain upon the plant 

 over winter, the young shoots appearing in their axils in spring : 

 ament surpassed in length by its leafy peduncles, 3—5 cm. long, 

 1-2 cm. thick, six to eight leaves on the peduncle somewhat 

 smaller than the leaves on the shoot otherwise like them, aments 

 often in pairs or threes at the ends of the branches, appearing in 

 May in Oregon and northern California and flowering inter- 

 mittently all summer, scales oblong and obtuse in the staminate 



