618 SALICACE^ salix 



maa nearly sessile. Common on stream -banks, eastern Washington to 

 California and New Mexico. 



§ 2 Shrubs or small trees. Leaves linear to lanceolate, re- 

 motely denticulate to entire. Aments borne on short lateral 

 leafy branchlets, often clustered. Scales pallid, somewhat decid- 

 uous. Stamens only 2. 



S. fluviatilis Nutt. Sylva i, 73- S. longifolia Muhl. not of Lam. A 

 much branched shrub 2-12 feet high forming thickets, or sometimes tree- 

 like and 20-30 feet high : leaves linear-lanceolate to linear-oblong, 2-4 

 inches long, silky-pubescent when young, glabrous when mature, entire or 

 sparingly dentate, acuminate, shortly petioled : stipules minute or none : 

 aments linear-cylindric ; the staminate dense, 1-2 inches long, sometimes 

 polygamous; stamens 2; filaments distinct, pubescent; pistillate looser, 

 about 2 inches long in fruit, their scales deciduous : stigmas broad, sessile: 

 capsule ovoid-conic, glabrous or silky, about 2 lines long. In moist soil 

 along streams in the interior, Brit. Columbia to California and east to 

 Missouri and Kentucky. 



Var. tenerrima. S. longifolia var. tenerrima Henderson. " A 

 smooth shrub 6-12 feet high with light bark up to the youngest branches: 

 leaves shorter and narrower, %-l line wide on fructiferous branches, 1-2 

 lines wide on the sterile, glabrous or very early glabra te : pedicels slightly 

 longer: capsule glabrous: scales glabrous* save for the slightly ciliate edges. 

 Shaded rocky banks of mountain rills Elmore Co. Idaho. " 



S. argophylla Nutt. Sylva i, 71. S. Hindsiana Benth. A shrub or 

 small tree 3-15 feet high forming thickets bat not growing in clumps, each 

 stem being distinct from any other : leaves narrowly lanceolate, 2-3 inches 

 long, closely sessile, entire or rarely minutely and remotely denticulate, ap- 

 pressed silky-pubescent both sides : stipules, obsolete, or on young vigorous 

 shoots sometimes minute ones occur; aments 1-2 inches long, on short leafy 

 branchlets appearing after the leaves in spring and intermitently all sum- 

 mer; staminate aments 1-3 at the ends of the branchlets, the scales oblong, 

 obtuse, glabrous on the back, crisp-hairy on the margins and toward the 

 base, erose toward the apex: stamens 2, the filaments densely hairy: 

 pistillate aments rather loosely flowered, 1-3 inches long, the lanceolate 

 acutish scales subpersistent, woolly except near the apex: capsule lanceo- 

 late, appressed silky when young, closely sessile : stigmas sessile. Along 

 rivers, Brit. Columbia to California. 



S. exigua Nutt. 1. c. A low shrub or small tree 5-15 feet high : usual- 

 ly with a single trunk, rough bark and glabrous twigs: leaves narrowly lan- 

 ceolate to oblanceolate, acute,, subentire, 1-5 inches long, glabrate above, 

 sparingly appressed-silky beneath, closely sessile: stipules none or minute: 

 aments on leafy branchlets, solitary or 2-4 together: staminate aments 1-2 

 inches long, slender, the scales lanceolate, acute: capsule becoming glabrous, 

 sessile: stigmas sessile. Along streams. Washington to California 



S. sessilifolia Nutt. 1. c. Shrubby or often tree-like 6-30 feet high, 

 young shoots very leafy, hoary-pubescent, becoming glabrous and brown: 

 leaves membranaceous, elliptical, acute at both ends, 1-5 inches long 1-2 

 inches wide, closely sessile, obscurely and remotely denticulate, hoary 

 with rather long pubescence when young, glabrous when mature: aments 

 borne upon lateral leafy shoots, 3-4 inches long often 3 together, very 

 densely flowered: scales oblong or obovate, rounded or retuse at the apex, 

 nearly or quite glabrous: stamens 2: lower half of filaments very hairy, upper 

 half minutely puberulent: pistillate smaller; the scales narrower: capsule 

 lanceolate, silky-pubescent when young, becoming nearly glabrous at maturity 



