A Bud and Twig Key 



F0yt/s atropunict* 



Plotonvs 



Celt it occidental*. 



Liriodendron 



PLATE IV. 



L Leaf-scar magnified. 



L/L Longisection showing chambered pith. 



//. Bud-scales loosely imbricated. 



gi. Twigs glabrous slender, dull red, becoming 

 grayish brown the second year, buds acute 

 strongly angled, scales dark brown/ minutely 

 pubescent scarious margins. 



Q. nigra Linn. 



g2. Twigs coated with tomentum, stout becom- 

 ing dark brown often with glaucous bloom, 

 buds obtuse tomentose one-fourth to one- 

 third inch long, outer scales linear lanceolate, 

 inner scales wider and rounded at apex. 



Q. densi flora Hooker & Arn. 

 J2. Bud-scales firmly imbricated. 



gi. Buds less than one-fourth inch long. 

 in. Buds covered with pubescence. 



