Feb., 1905.] Key— Ohio Woody Plants. 285 



— 109 — 



109. Pith large, white, with cavities or more or less diaphragmed ; twigs 



robust, gray, with large lenticels; bundle scars in a ring in the 



large leaf scar; trees. PAULOWNIA. 

 109, Leaves with tendrils on the persistent petiole which shows 2 leaflet 



scars at the end; climbing vines with rather large, sometimes 



hollow pith. BIGNONIA. 



109. Pith not diaphragmed nor with lenticular cavities; petioles not with 



tendrils. 110 



110. Axillary buds evident. 112 



110. Axillary buds minute and not evident, or covered by the persistent 



petiole base. 111. 



111. Bundle scar forming a curved line ; lateral buds sunken in the bark ; 



leaf scars after in threes. CEPHALANTHUS. 

 111. Bundle scars 3; terminal bud with 2 acuminate visible scales. 



CORNUS. 



111. Bundle scars 3; terminal bud small, dome-shaped; axillary buds 



bursting through the prominent petiole base ; twigs many-angled 



PHILADELPHUS. 



112. Twigs green or greenish, never twining. 113 



112. Twigs gray, brown, or red, not green when ripe. 115. 



113. Terminal bud self-pruned; stipular scars prominent; bark with 



strong odor. STAPHYLEA. 



113. Terminal bud present. 114. 



114. Leaf scars meeting and ending upward in a free appendage; base of 



petioles in some cases originally covering the axillary buds; 

 bundle scars 3 or more. ACER. 



114. Leaf scars not meeting; twigs more or less 4-angled; base of petiole 



not covering the axillary bud; bundle scar 1. EUONYMUS. 



115. Twigs and buds brown-scurfy or stellate-pubescent; bundle scar 1; 



shrubs. LEPARGYREA. 



115. Not brown-scurfy or stellate-pubescent. 116. 



116. Bundle scars numerous in an ellipse or a ring ; trees with small flat 



buds or woody vines climbing by rootlets. 117. 



116. Bundle scars 1, 3, or 5, or sometimes more but not in a ring. 118. 



117. Trees with small flat iDuds; twigs gray, robust; pith large, white; 



leaf scars often in threes. CATALPA. 

 1 1 7. Woody vines climbing by rootlets ; ends of the twigs usuallv 



withering. TECOMA. 

 1 IS. Pith very large, the soft wood small in proportion; twigs either with 



cleavage planes in the upper leaf nodes or with brown papery 



outer bark separating readily from the green inner layer; 



shrubs with robust twigs. 119. 



118. Pith small or if rather large then the plants trees. 120. 



119. Lenticels conspicuous; tips of twigs self-pruned in the leaf nodes. 



SAMBUCUS. 



1 1 9. Lenticels inconspicuous ; twigs not self-pruned ; outer papery brown 



bark easily separated from the inner dark green layer. 



HYDRANGEA. 



— 120 — 



120. Bundle scars 1, or several closely united in a curved line appearing 



as 1. 121. 



120. Bundle scars 3 or more, distinct. 125. 



121. Low shrubs with decurrent ridges from the middle of the leaf scar. 



122. 

 121. Trees or erect shrubs without decurrent ridges from the middle of 

 the leaf scar but sometimes with ridges or wings from the ends 

 of the leaf scar. 123. 



