282 The Ohio Naturalist. [Vol. V, No. 4, 



G3. Bark not spicy-aromatic. 64. 



64. Pith diaphragmed but solid; bundle scars definitely 3; trees. 



NYSSA. 



64. Pith not diaphragmed; bundle scar usually central. 65. 



65. Leaf scars with the drv stipules rather persistent; bark with strong 



odor. AMORPHA". 



65. Stipules not evident, or minute; bark not with strong odor. 66. 



66. Stipular scars or stipules present, stipules minute. ILEX. 



66. Stipular-scars and stipules absent; buds small, twigs light grav. 



ILICIOIDES. 



— 67 — 



67. Outer bud scales more than 1. 68. 



67. Outer bud scale 1 ; twigs usually with Ijrittle zones and hence very 



easily detached; stipular scars present; bundle scars .3. SALIX. 

 ()S. Terminal and lateral buds stalked; pith 3-angled; both staminate 

 and carpellate catkins present all winter. ALNUS. 



68. Buds sessile or nearly so ; pith not 3-angled. 69. 



69. Pith more or less 5-angled. 70. 



69. Pith cylindrical or nearly so. 74. 



70. Buds clustered at the tip of the twig; bvindle scars numerous, 



scattered. QUERCUvS. 



70. Buds not clustered at the tip. 71. 



71. Bundle scars numerous usually scattered. 72. 

 71. Bundle scars 3. 73. 



71. Bundle scar 1 ; bark green, spicy- aromatic; internodes verv unequal 



SASSAFRAS. 



72. Buds small with about 3 outer scales; twigs reddish or yellowish- 



brown, glabrous or pubescent; terminal bud present or al:)sent ; 

 stipular scars prominent. CASTANEA. 



72. Terminal bud large with 4 or more visible scales, hairy or peltate 



pubescent; lateral buds iisuallv .superposed; twigs tough. 



HICORL\. 



73. Without stipular or self-pruning scars; crushed buds fragrant, 



aromatic, not resinous, glabrous. LIQUIDAMBAR. 



73. Stipular and self-pruning scars present ; crvished buds not fragrant 



though they may have a resinous odor, resinous or if only slightly 

 so then the twigs pubescent or tomentose. POPULUS. 



74. Pith diaphragmed but solid; bundle scars 3; no stipular scars; trees. 



NYSSA. 



74. Pith not diaphragmed or if diaphragmed then not solid. 75. 



75. Bud scales tipped with short sharp points; stem twining; buds 



conical, pungent. CELASTRUS. 



75. Bud scales not spiny-tipped; stems not twining. 7(). 



76. Pith very large, light brown, bark not resinous, ill-smelling; buds 



spherical or flattened at the apex, often clustered at the tip of 

 the twig, brown and pubescent; bundle scars about 9 along the 

 lower edge of the very large leaf scar which does not svuTound 

 the axillary bud; large trees. AILANTHUS. 



76. Pith small, or if large and brown then the leaf scar surrounding tlie 



axillary bud or the bark resinous. 77. 



77. Bark with a resinous or sticky milky sap; pith usually large, if 



rather small then the bark aromatic, or the plants climbing bv 

 rootlets. 78. 



77. Bark not resinous. 79. 



78. Buds clustered at the tip of the twig; bark spicy-fragrant to the 



smell; base of petiole prominent with several Inmdlc scars; 

 fruiting panicles plumose, COTINUS. 



