Feb., 1905.] Key— Ohio Woody Plants. 283 



78. Buds not clustered at the tip ; bark sometimes aromatic, often very 



poisonous to the touch ; leaf scar in some species surrounding the 

 axillary bud in others only partly surrounding the bud or the 

 bud covered; small trees or shrubs or woody vines climbing by 

 numerous rootlets. RHUS. 



79. Leaf scars surrounding the hairy sunken axillary buds; terminal 



bud self-pruned and thus the twigs with peculiar rings. DIRCA. 

 71>. Leaf scars not surrounding the axillary buds and twigs not with 



peculiar rings. 80. 

 SO. Base of petiole and stipules persisting, prominent, drying off; small 



shrubs. 81. 

 80 Petiole deciduous close to the brak, leaving a definite leaf scar. 82. 

 81. Bundle scars 3; pith large; bark not shreddy. RUBLTS. 



81. Bundle scar 1; pith small; stipviles sheathing the stem; bark dark 



brown, shreddy. DASIPHORA. 



— 82 — 



82. Bundle scar 1, or if several then closely crowded and confluent, 



appearing as 1. 83. 



82. Bundle scars 3 or more, distinct. 96. 



S3. Climbing vines, the stems herbaceous above; young twigs gray 

 pubescent. SOLANUM. 



83. Stem climbing, woodv throughout; bark light gray; buds often 



clustered. LYCIUM. 

 S3. Stem not climbing, woody throughout. 84. 



84. Stipular scars or stipules present. 85. 



84. No stipular scars or stipules. 87. 



85. Terminal -bud present. 86. 



85. Terminal bud absent; bud scales dark brown or black. RHAMNUS. 



SO. Stipules deciduous; low shrubs. CEANOTHUS. 



80. Stipviles usually persistent, minute; erect shrubs. ILEX. 

 87. Terminal bud present. 88. 



87. Terminal bud absent. 91. 



88. Bark of twigs very spicy-aromatic, green; internodes very unequal. 



SASSAFRAS. 



88. Bark not spicy-aromatic. 89. 



89. Internodes very unequal ; bark brown or gray. AZALEA. 



89. Internodes not verj^ unequal. 90. 



90. Twigs glabrous, gray or blackish-brown. ILICIOIDES. 



90. Twigs pubescent or tomentose, reddish or light-brown. SPIRAEA. 



91. Trees with polished, greenish-brown, grayish-yellow, or red twigs; 



bark sour; leaf scar prominent, semi-oval, with a dark central 

 scar usually in the form of a ring; buds small, not projecting 

 much beyond the epidermis; the large terminal panicled raceme 

 with capsules persisting all winter. OXYDENDRUM. 



91. Trees with brown pubescent twigs; or shrubs. 92. 



92.- Trees with 2 visible scales in the triangular flattened bud; pith 

 often with lenticular cavities; twigs pubescent, zigzag at the 

 tip. DIOSPYROS. 



92. Low shrubs with several visible scales in the bud. 93. 



93. Twigs finely white-speckled and granulated, green or reddish. 



VACCINIUM. 



93. Twigs not white-speckled. 94. 



94. Buds of two kinds, large flower buds with many visible scales and 



small ones with 2 outer scales. GAYLUSSACIA. 



94. Buds all alike, with several scales. 95. 



95. Surface of leaf scar rather even; self-pruning scars present; twigs 



reddish-ohve. POLYCODIUM. 

 95. Surface of leaf scar very uneven; no self-pruning scars; bud scales 

 numerous. SPIR^A. 



