202 
The Ohio Naturalist. 
[Vol. V, No. 4, 
63. 
64. 
64. 
65. 
65. 
66 . 
()(). 
67. 
()7. 
() 8 . 
68 . 
69. 
69. 
70. 
70. 
71. 
71. 
71. 
72. 
73. 
73. 
74. 
74. 
1 5 . 
t o. 
76. 
I I . 
78 . 
Bark not spicy-aromatic. 64. 
Pith diaphragmed but solid; bundle scars definitely 3; trees. 
XYSSA. 
Pith not diaphragmed; bundle scar usually central. 65. 
Leaf scars with the dry stipules rather jjersistent ; bark with strong 
odor. AMORPHA. 
Stipules not evident, or minute; bark not with strong odor. 66. 
Stipular scars or stipules present, stipules minute. ILEX. 
Stipular-scars and stipules absent; buds small, twigs light gray. 
ILICIOIDES. 
— 67 — 
Outer bud scales more than 1. 68. 
Outer bud scale 1 ; twigs usually with brittle zones and hence very 
easily detached; stipular scars present; bundle scars 3. SALIX. 
Terminal and lateral buds stalked; pith 3-angled; both staminate 
and carpellate catkins present all winter. ALXUS. 
Buds sessile or nearly so; pith not 3-angled. 69. 
Pith more or less 5-angled. 70. 
Pith cylindrical or nearly so. 74. 
Buds clustered at the tip of the twig; bundle scars numerous, 
scattered. QUERCUS. 
Buds not clustered at the tip. 71. 
Bundle scars numerous usually scattered. 72. 
Bundle scars 3. 73. 
Bundle scar 1 ; bark green, spicy-aromatic; internodes very unequal 
SASSAFRAS. 
Buds small with about 3 outer scales; twigs reddish or yellowish- 
brown, glabrous or pubescent ; terminal bud present or absent ; 
stipular scars prominent. CASTAXEA. 
Terminal bud large with 4 or more visible scales, hairy or peltate 
pubescent ; lateral buds usually superposed ; twigs tough. 
HICORIA. 
Without stipular or self-pruning scars; crushed buds fragrant, 
aromatic, not resinous, glabrous. LIQUIDAMBAR. 
Stipular and self-pruning scars present ; crushed buds not fragrant 
though they may have a resinous odor, resinous or if only slightly 
so then the twigs pubescent or tomentose. POPULUS. 
Pith diaphragmed but solid; bundle scars 3; no stipular scars; trees. 
XYSSA. 
Pith not diaphragmed or if diaphragmed then not solid. 75. 
Bud scales tipped with short sharp points; stem twining; buds 
conical, pungent. CELAvSTRUS. 
Bud scales not spiny-tipped; stems not twining. 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 surround 
the axillary bud; large trees. AILAXTHL^S. 
Pith small, or if large and brown then the leaf scar surrounding the 
axillary bud or the bark resinous. 77. 
Bark with a resinous or sticky milky sap; pith usually large, if 
rather small then the bark aromatic, or the plants climbing by 
rootlets. 78. 
Bark not resinous. 79. 
Buds clustered at the tip of the twig; bark spicy-fragrant to the 
smell; base of petiole prominent with several bundle scars; 
fruiting panicles plumose. COTIXUS. 
