Tin 7Yf < s of T( .///* 57 



bear a tuft of long silky hairs at the apex. Found principally 

 in damp situations. Then* are so many hybrids and intro- 

 duced species that the classification of the willows is difficult 

 and sometimes impossible. The following key includes the 

 forms which are known to occur in our area. 



Branches decidedly drooping 1. S. babylonica. 



Branches not decidedly drooping. 

 Leaves small, l/3'-l 1/3' long, entire or nearly so, 



pale green on both sides 2. S. taxifolia. 



Leaves long, 4'-7', silvery white below 3. S. longipes. 



Leaves green on both surfaces, 3'-6' long, %'-%' 



wide, narrowly lanceolate, long-pointed 4. S. nigra. 



Leaves pale, or glaucous below, 2- %'-4' long, 



% '-1 % ' wide, broadly lanceolate 5. S. amygdaloides. 



Leaves linear, lanceolate green on both surfaces, 



2'-6' long, V 8 '-1/3' wide 6. S. interior. 



1. Salix babylonica L. Weeping Willow. An ornamental 

 tree which has been introduced from Asia and is grown quite 

 extensively throughout North and South America. Its dis- 

 tinguishing mark is the drooping habit of its branches from 

 which its name is derived. Sometimes reaching a height of 

 60' and a trunk diameter of 3-5, with bark on old parts gray, 

 rough and fissured. The young twigs are green, slender, and 

 drooping. Leaves linear to linear lanceolate, pointed, pale 

 green below. It is used only as an ornamental shade tree. 



2. Salix taxifolia H. B. K. Willow. Yew Leaved Willow. 

 A tree sometimes reaching a height of 40-50 and trunk 

 diameter of 18', with broad open crown, light gray-brown, 

 fissured bark, %'-!' thick, covered with small scales. Leaves 

 smaller than any of the other species of willow, l/3'-l 1/3' 

 long, l/!2'-l/8' wide. 



Arizona southward through western Texas and Mexico to 

 Guatemala. It is sometimes planted for ornament. 



3. Salix longipes Anderson. Ward's Willow. Trees 

 reaching a height of 30 and trunk diameter of 6'-8', with 

 thick, brown, rough bark divided into angular plates, hairy 

 and reddish brown on young twigs. Leaves lanceolate to 

 ovate lanceolate, somewhat pointed at the apex, round or 

 heart-shaped at base, bright green and smooth above, pale and 

 glaucous or hairy beneath. Flowers in April and May. 



