- / It ltd and 7\v/// /\Yy 



73 



flattened against twig, twig glabrous light 

 brown. 



*Morus rubra Linn. 

 // Buds ovate acute, more than four scales 



visible. 



gi. Bundle-scars about six to ten scattered, bud 



appressed, not more than five scales visible. 



Moms rubra (see above). 



g2. Bundle-scars three to six arranged in a 



lunate line. 



hi. Pith five-angled, terminal bud ovate long 

 pointed, leaf-scar broad, outermost bud- 

 scale directly above leaf-scar, middle one 

 of the three bundle-scars often double, 

 branchlet roughened by elevated leaf- 

 scars. 



Populus Linn. 

 ii- Terminal bud one-half to three-fourths 



inch long, resinous. 



//. Buds fragrant very resinous, three- 

 fourths inch long and one-fourth 

 inch broad, lateral buds often flat- 

 tened against twig, twigs stout light 

 or dark orange color lustrous, bud 

 scales slightly pubescent at base, 

 scarious margins. 



P. trichocarpa Torr. & Gr. 



'Compare Celtis occidentalis. 



P <irandidentata Carping earoliniana 



C Cross-section of twig. 

 L Leaf-scar magnified. 



