190 SALICACEAE 



Twigs puberulent; leaf-blades usually glandular-denticulate. „ 

 Bractlets oblong, yellow: leaf-blades usually broadly o*'1^^3<'<'^^^J'p^^„„„,j 



Leaves oblanceolate or oblong-lanceolate; bractlets oblong. 



Leaves silvery-silky beneath, not strongly reticulate; bractlets black. 



5(). O- OdlQ. 



Leaves wliite-tomentose beneath, strongly reticulate; bractlets brown. 



51. O. CQUQluQ.. 



Aments less than 1 cm. broad; ovary less than 5 mm. long. 



Leaves broadly obovate. . , , ^ , co c ^urhor^iu 



Twigs puberulent; bractlets light brown; stamen 1. .^2. S. sitchensis 



T^ls ilabrous; bractlets blackish; stamens 2. 53. S. Drummondiana. 



T tin-vpis nblonc lanceolate, or oblanceolate. . ^ , , ^x 



^^Tractle?s vellow or brown; stipes 3-4 times as long as the nectaries .style ess than 

 5 mm long ^^- ^- argyrocarpa. 



Bractlets fuscous; stipes less than twice as long as the nectaries 



Style about 0.5 mm. long; bractlets obtuse. 55. 5. arDusculoiaes. 



Style 1-2 mm. long. , ., 



Branches without a bloom; leaves tomentose beneath. 



oo. o. pcllltci. 

 Branches with a bloom ; leaves white-silky beneath. ^ ^ . , 



Aments peduncled and leafy-bracted. 57. S. subcoerulea. 



Aments sessile and naked. 58. S. pachnophora. 



X. Arctic.^e. 



Aments on leafy peduncles. 



Leaves grayish villous on both sides, less so on the upper. 



Twigs wMte- villous or silky; branches yellow or grayish. urnrhumrna 



Leaves villous; capsules densely pubescent. 59. i. oracnycarpa. 



Leaves silky; capsules finely and sparingly pubescent. ^^ ^ (dahoensis. 



Twigs puberulent; branches usually purplish. 



Bractlets black or with blackish tips. ,_ i j- „„„„(- 



Leaves oblong, 2-3 cm. long; bractlets obovate; ^^-l-^hes divergen^t^^^^^^^ 



Leaves oblanceolate or obovate, 3-6 cm. long; bractlets oblong: branches 

 ascending. 62. S. glaticnps. 



Bractlets yellow oblong. 63. S. Seemannu. 



Leaves glabrate or when young covered with wliite hairs parallel to the midrib. 

 Shrubs not creeping, although often depressed. ^ ^ ^ 



Leaves broadly oval, often minutely glandular-dentate „,^„,„ 



Leaves narrower. 



Leaves oblong or oblanceolate. or ovate. 



Leaves 2-4 cm. long; capsule 3-5 mm. long. ,,. . , , , ^ 



Bractlets yellow or brown, oblong: leaves elliptic or oblanceolate, 



thin, darkening in drj-ing; twigs purple. 65. S. deserlorut7}. 

 Bractlets fuscous at the apex; leaves oblong, not blackening in 



drying. 61. S. pseudnlapponum. 



^^Bractlets'fuscous; leaves elliptic or oblong, obtuse or acute, usually 

 reticulate; glabrous only in age. 62. S. glaiicnps. 



Bractlets yellow or brown; leaves usually short-acuminate, glabrous 

 except when very young, not reticulate. 

 Leaves entire or sparingly glandular-denticulate, oblanceolate. 



66. S. Auslinae. 

 Leaves finely serrulate, elUptic. lanceolate, or oblanceolate. 



67. S. MacCalliana. 

 Leaves linear-lanceolate. 68. S. saskalchcwana. 



Shrubs creeping: arctic or alpine. 



Leaves obovate or oblanceolate; aments many-flowered^^^ ^ netrophila 



Leaves narrowly oblanceolate; aments few-flowered. 70. S. cascadensis. 

 Aments naked, from la.tcral buds. Ndsonii 



Leaves oblauc.oUt.-, sin.ngly veined. 71. 6. ^ffj\f.j 



Leaves elliptic, not strongly veined. 72. A. cnioropnyiia. 



XI. Reticulatae. 

 Leaves covered beneath with long white silky hairs. 73. S. Fernaldii. 



Leaves at least in age not silky. ^ 



T paf-hlade over 1 cm. long; aments comparatively many-nowereci ^ , ,, ., 



Filamlnls very hairy on the lower part; leaves strongly reticulate; bracts broadly 



obovate. fuscous, the upper portion almost glabrous_.^ ^^ orbiculnris. 

 Filaments almost glabrous; leaves less strongly reticulate: bract-scameate^^ 

 Leaf-bladeT'cm 0° less long:' aments few-flowered; b'-^tlets yellow^almost glabrous. 



