The Trees of Vermont 77 



SUMMER KEY TO THE SPECIES OF JUGLANS 



a. Leaflets 11-17, the terminal usually present ; pith of twigs chocolate- 

 brown ; bark of trunk rather smooth, or fissured, with broad, flat, 

 whitish ridges; fruit elongated, sticky-downy. .J. cinerea, p. 79. 

 aa. Leaflets 13-23, the terminal often lacking; pith of twigs cream 

 colored ; bark of trunk rough, brownish or blackish, deeply fur- 

 rowed by broad, rounded ridges ; fruit globose, not sticky-downy, 



J. nigra, p. 81. 



WINTER KEY TO THE SPECIES OF JUGLANS 



a. Pith chocolate-brown ; leaf-scar with downy pad above ; fruit elon- 

 gated, sticky-downy ; terminal bud 3^--)4 "ich long ; bark rather 

 smooth, or fissured, with broad, flat, whitish ridges, 



J. cinerea, p. 79 

 aa. Pith cream colored ; leaf-scar without downy pad above ; fruit 

 globose, not sticky-downy; terminal bud V? inch long; bark rough, 

 brownish or blackish, deeply furrowed by broad, rounded ridges, 



J. nigra, p. 81. 



