SALICACEAE (wiLLOW FAMILY) 129 



Stamens 2, filaments hairy below; leaves linear or narrowly 



elliptical, remotely denticulate: shrubs . . . m. LOIfGIFOLIAE. 

 Scales not pale yellow, mostly brownish to black, persistent. 



Styles none; minute prostrate plant ..... IV. RETUSAE. 

 Styles distinct; erect or ascending shrubs. 



Styles 0.3-0.7 mm. long; aments pedunculate; leaves and 



capsules glabrous V. CORDATAK. 



Styles 1-2.5 mm. long (sometimes shorter in No. 18), leaves 

 more or less tomentose, at least above; capsules gla- 

 brous to tomentose. 

 Styles 1-1.5 mm. long; aments pedunculate (if sessile, 



the leaves not glandular) VI. COHMOT^TAE. 



Styles 1.5-2.5 mm. long; aments stout, sessile; leaves 



glandular VII. LANATAE. 



CAPSULES HAIRY. 

 Scales yellow, deciduous; filaments hairy below; styles none (iif 



our species) , .III. L0N6IF0LIAE. 



Scales not yellow, mostly brown or black, at least at the tip, 



persistent. * 



Styles elongated, 0.5-2 mm. (over 1 mm. long, except in one 



species of Commutatae), 



Leaves usually gray-tomentose on both sides, sometimes 



on the upper surface only; aments mostly on long 



. , leafy peduncles; capsules gray- or white-tomentose. 



Capsules thinly villous-tomentose; stigmas entire, short 



(two species of ), VL COMMUTATAE. 



Capsulesdensely whit&^dmentose; stigmas.entire'Or usu- ■ ' 



ally divided, much elongated, about 1 mm. long . Vni. ARCTICAE. 

 Leaves glabrous on both surfaces or densely silvery- 

 pubescent on the lower surface only; aments dense, 

 sessile or on short, leafy peduncles; capsules silvery- 

 pubescent. 

 Leaves densely clothed with a fine satiny pubescence '' 

 below, glabrate. above; aments on short leafy pe- 



' duncles IX. ARGENTEAE. 



Leaves glabrous on both surfaces, bright green; aments 



closely sessile X. PHYLICIFOLIAE. 



Style obsolete, or only 0.2-0.3 mm. long. < 



Tall erect shrubs; capsule conio-rostrate. 



Aments stout, dense, sessile or subsessile; scales dark, 

 long-villous; pedicel short or none; stigmas long, 



slender ' XI. CAPREAE. 



Aments slender and lax, the staminate small, on short 



leafy peduncles; scales pale, thinly villous; pedicel 



elongated; stigmas short XII. ROSTRATAE. 



Low de|3ressed or creeping shrubs; capsules short, ovate- 

 conic, subsessile; aments: small, few-flowered, shorfr- 

 peduncled; leaves obovate, reticulate on both sides . Xm. RETIGtAiATAE. 



1. Amtgdaunae. — Trees 3-lB m. high; bark hrown; twigs long and slender, 

 often drooping, itsvally gray: leaves linear-lanceolate to broadly lanceolate, 

 acuminate, chsely and finely serrulate, glabrous; stipules small and decidu- 

 ous or none: aments coetaneoxis, slender cylindrical, terminal on lateral leafy 

 twigs: scales deciduous, lightryellov), lanceolate or broader, mostly glabrous 

 outside, cri^p-mUous within: stamens 3-7, filaments hairy below: capside 

 small, glabrous, pedicellate; styles 0.3-O.B mm. long; stigrnas short'. 



Leaves linear-lanceolate, deep green beneath , . . . . 1. S. nigra. 

 Leaves lanceolate or broader, glaucous beneath , . . . .2. S. amygdaloides. 



1. Salix nigra Marsh, Arb. Am. 139. 1785. Dark green; twigs gray or 

 brownish: leaves linear-lanceolate, long-acuminate, often falcate, deep_ green 

 on both sides, 6-11 cm. long, 7-12 mm. wide (often oblanceolate while un- 

 folding) ; petioles short, 3-6 mm. long: staminate aments yellow, 2-5 Cm. long; 

 pistillate aments 2-6 cm. long in fruit: capsules ovate or ovate-lanceolate, 3-4 

 mm. long; pedicels 1-1.5 mm. long. Black Willow. (S. Wrightii Anders, 

 foimded on a monstrous form with compact and distorted aments.) — ^River 

 banks, common; plains of eastern Colorado to New Mexico and California.- 



2. Salix amygdaloides Anders. Of v. Handl. Vet. Akad. 114. 1858. Yel- 

 lowish green; twigs gray or the youngest yellow: leaves lanceolate to ovate- 

 lanceolate (frequently obovate or broadly oblanceolate and obtuse when un- 

 folding), gradually or abruptly acuminate, green above, glaucous beneath, 

 5-12 cm. long, 1.5-3 cm. wide; petioles slender, 5-15 or 20 mm. long: staminate 



