SALICACEAE. 113 



orshort-stipitate 1 -celled ovary subtended by a minute disk; ovules 

 usually numerous; fruit an ovoid or oblong or conic 2-4-valved 

 capsule; seeds minute; endosperm none. 



Ament bracts entire; stamens 1-10; stigmas short. 144. SALIX, 113. 



Ament bracts fimbriate or incised; stamens numerous; 



stigmas elongated, 145. POPULUS, 118. 



144. SALIX.* WILLOW. 



Trees or shrubs with single-scaled buds, the scales with an 

 adherent membrane within; leaves short- petioled, mostly narrow, 

 with broad or minute stipules; aments appearing before, with 

 or after the leaves, erect or spreading; bracts of the aments mostly 

 entire, small or minute; flowers each with one or two small glands 

 at its base; stamens 1-10, mostly 2 or 5; ovary sessile or short- 

 stipitate, glabrous or pubescent. 



Trees with longitudinally furrowed bark; petioles glandu- 

 lar; aments on leafy peduncles; stamens 5 or more. S. lasiandra lyallii. 

 Shrubs or small trees; bark not furrowed; stamens 2 or 1. 

 Scales yellow, deciduous; aments appearing long after 



the leaves, on long leafy peduncles. 

 Capsule 4 mm. long, obtuse, glabrous; stigmas 



sessile, short; leaves glabrate. S. melanopsis. . 



Capsule 5-7 mm. long, acute, pubescent (becoming 

 glabrate); styles 0.5 and stigmas 1 mm. long. 

 Branchlets, leaves and capsules thinly villous; 



leaves acute to acuminate at both ends. S.fluviatilis (?). 



Branchlets, leaves and capsules densely villous; 



leaves sessile, rounded to acute at base. S. sessilifolia. 



Scales light brown to black, persistent; aments appear- 

 ing before or with the leaves. 

 Capsule glabrous. 



Low shrubs; scales very small, light brown. 

 Pedicels 3-5 mm. long; leaves thin, coarsely 



reticulate with slender veins. S. prolixa. 



Pedicels 2-3.5 mm. long; leaves thick, finely 



reticulate with coarse veins. 5*. pedicellaris. 



Tall shrubs or small trees; scales mostly black. 



Pedicels 2-4 mm. long; styles 0.5 mm. long. S. mackenziana. 

 Pedicels 1-2 mm. long; styles 1-1.5 mm. 



long. 

 Aments on leafy peduncles; low alpine 



shrubs. 

 Leaves glabrate above, glabrous and 



glaucous beneath. S. bardayi. 



Leaves tomentose and green on both 



sides, becoming glabrate. S. commutata. 



Aments sessile or subsessile, elongated; 



tall coastal shrubs. 

 Branchlets and leaves glabrous 



* The treatment of the genus Salix has been revised and amplified with 

 the assistance of Mr. C. R. Ball. 



