Feb., 1905.] 
Key — Ohio Woody Plants. 
279 
24. Shrubs with delicate spray-like twigs which are self-pruned; leaves 
minute. TAMARIX. 
2o. With tendrils opposite the leaf scars; usually every third leaf node 
without a tendril; climbing plants self-pruning unripe twigs by 
means of cleavage planes in the leaf nodes. 26. 
2 . 5 . No tendrils opposite the leaf scars. 27. 
26. With woody partitions in the brownish pith at the leaf nodes; 
lenticels inconspicuous; tendrils without adhering disks; surface 
of leaf scar irregular. VITIS. 
26. Pith continuous, white ; lenticels conspicuous ; tendrils without 
adhering disks in our species; leaf scar rather smooth. 
AMPELOPSIS. 
26. Pith continuous, white; lenticels conspicuous; tendrils usually with 
adhering disks; leaf scars smooth, concave, with small bundle 
scars scattered or in a ring. PARTHEXOCISSUS. 
27. Leaf scars alternate. 28. 
27. Leaf scars opposite or whorled. 109. 
28. Twigs with distinct and complete stipular ridges or rings at the leaf 
nodes. 29. 
28. Twigs without complete stipular rings. .31. 
29. Leaf scar surrounding the axillary bud, terminal bud self-pruned; 
wood with prominent medullary rays. PLATAXUS. 
29. Leaf scar not surrounding the axillary bud, terminal bud not self- 
pruned; buds enclosed in the large connate stipules. 30. 
30. Buds glabrous; twigs brown; pith diaphragmed; leaf scars oval or 
circular; bark spicy-aromatic. LIRIODEXDROX. 
30. Buds downy, or if glabrous then the twigs red; pith with or without 
diaphragms; leaf scars U-shaped, oval, or circular; bark usually 
aromatic. MAGXOLIA. 
31. With thorns, prickles, or spines; or with spur-like branches ending 
in thorns. 32. 
31. Without thorns, prickles or spines but some may have thorn-like 
stunted branches. 42. 
32. With leaves reduced to simple or branches spines. BERBERIS. 
32. With stipular spines, a pair for each leaf scar. 33. 
32. Twigs with typical lateral thorns, without terminal thorns. 34. 
32. With thorns at the ends of branches or with spur-like branches end- 
ing in thorns, and in addition axillary thorns may be present. 35. 
32. Stems or twigs with prickles, some of which may have the appear- 
ance of stipular spines. 39. 
32. Bud scales tipped with spines; stem twining; leaf scar central. 
CELASTRUS. 
33. Leaf scar covering the two or more superposed axillarv buds. 
' ROBIXIA. 
33. Leaf scar below the axillarv buds; buds reddish, pubescent. 
XAXTHOXYLUM. 
34. With thorns beside the axillary buds; normally one for each leaf 
axil, becoming gradually smaller toward the tip of the twig, 
terminal bud absent. TOXYLOX. 
34. Thorns axillary, large, rarely branched except on the main trunk; 
usually with two lateral buds at the base which may develop as 
twigs; numerous axils without thorns. CRATAJGL"S. 
34. Thorns commonly branched, situated above the axil of the leaf; 
leaf scar covering the two or more superposed axillary buds; 
twigs polished, often zigzag. GLEDITISA. 
35. Xot with three distinct bundle scars. 36. 
35. With three bundle scars. 37. 
