SALICACEAE (WILLOW FAMILY) 



43 



The pistillate catkins become very loose in fruit. Common in swamps 

 westwa,rd. 



S. longifolia. Sand-bar Willow. Scales yellowish, falling before 

 the capsules mature. Filaments hairy below.' Stamens 2. Leaves 

 tapering at each end, nearly sessile, more or less silky when young, 

 smooth and green on both sides when mature. Stipules small and 

 deciduous. A shrub or small tree which spreads extensively on allu- 

 vial deposits and forms dense clumps. 



S. cordata. Pussy Willow. Scales persistent, colored at the tip. 

 Stamens 2. Filaments glabrous. Capsules glabrous. Stipules per- 

 sistent, usually conspicuous. A widely distributed shrub character- 

 istic of wet places. A free hybridizer. 



S. Discolor, Pussy Willow. Scales persistent, colored at the tip. 

 Stamens 2. Filaments 

 glabrous. Capsules pu- 

 bescent. Catkins sessile 

 on the old wood, naked 



at base, appearing be- . . *ftS / ■ 1 \\ / / ' 



fore the leaves, thick, 

 cylindrical, appearing in 

 earliest spring. Scales 

 dark red, brown, or 

 blackish, densely clothed 

 with long glossy hairs. 

 Large shrub or small 

 tree common in low 

 meadows or along river 

 banks. 



POPULUS 



Trees with broad and 

 more or less heart- 

 shaped or ovate, 

 toothed leaves, and of- 

 ten angular branches. 

 Buds scaly, covered 



with resinous varnish. o-c Populus tremuloides, Aspen; o, pistillate cat- 



Catkins Ion? and '''"• *- P'^tillate flower with scale; c, leaf; d'U, 



. P. grandidentata, Large-toothed aspen; d, stam- 



drooping, appearing be- ;„^jg catkin; e, pistillate catkin; /, staminatc 



fore the leaves. Flow- flower; g, pistillate flower with scale; h. leaf. 



