Feb., 1905.] 
Key — Ohio Woody Plants. 
281 
.51. Twigs grayish-brown or reddish, usually zigzag; bark mucilaginous, 
fibrous; buds rather fleshy, usually bright red; medullary rays 
prominent when the bark is removed; the winged fruiting 
panicle often persistent. TILIA. 
.51. Twigs glabrous or pubescent, reddish or yellowish-brown; pith 
5-angled. CASTANEA. 
51. Twigs downy, grayish-green; pith white, cylindrical, large; bark 
very fibrous. BROUSSONETIA. 
51. Twigs coarsely glandular pubescent or sparingly hairy, brown; pith 
brown, cylindrical, small. CORYLUS. 
52. Bundle scars scattered; leaf scars oblique; twigs gray or light 
brownish-gray. MORUS. 
52. Bundle scars 3. 53. 
53. Twigs dark reddish-brown, speckled, often zigzag; buds reddish- 
violet, often superposed or clustered; leaf scars not oblique but 
below the lateral bud. CERCIS. 
53. Twigs dark brown, not speckled; buds not superposed; leaf scars 
oblique. 54. 
54. Bark smooth, trunk and larger branches with peculiar fluted or 
projecting ridges; bud scales brown, finely pubescent; staminate 
catkins in the bttd in winter. CARPINUS. 
54. Trunk not with fluted or projecting ridges. 55. 
55. Bark in rough ridges; no catkins; twigs and buds in most cases 
pubescent ; some species with characteristic transverse self- 
pruning scars on the twigs, others with corky ridges. ULMUS. 
55. Bark scaly, fine-furrowed, the furrows usually somewhat spiral; 
bud scales green with brown tips, nearly glabrous; staminate 
catkins exposed in winter. OSTRYA. 
55. Bark of trunk and larger branches separating into papery or leath- 
ery sheets; catkins in winter. BETULA. 
— 56 — 
56. With 2 or more superposed axillary buds; all except 1 may be very 
small. 57. 
56. Axillary buds single or 2 or more side b}^ side; not superposed. 67. 
57. Pith diaphragmed, with air cavities, brown; twigs thick, with large 
leaf scars and 3 prominent bundle scars; large trees. JUGLANS. 
57. Pith solid. 58. 
58. Stems twining ; leaf scars circular with numerous bundle scars ; buds 
partly hidden. MENISPERMUM. 
58. Stems not twining. 5fl. 
59. Buds partly sunken, hardly projecting beyond the surface; terminal 
bud self-pruned or tips of branches withering. 60. 
59. Buds not sunken in the epidermis. 61. 
60. Leaf scar not surrounding the axillary buds; pith large, chocolate- 
colored; twigs robu.st, polished, mottled white and purplish- 
brown. GYMNOCLADUS. 
60. Leaf scar surrounding the axillary buds, quadrangular L^-shaped; 
bark with pungent odor; pith white. PTELEA. 
60. Leaf scar covering the axillary buds; pith small; twigs brown, 
polished, often zigzag. GLEDITSIA. 
61. Pith cylindrical or nearly so. 62. 
61. Pith more or less 5-angled, yellowish or brownish; terminal bud 
large; bundle scars scattered; trees with tough twigs. HICORIA. 
62. Leaf scar surrounding the hairy axillary buds; bundle scars 5-9; 
terminal Inid self-pruned. CLADRASTIS. 
62. Leaf scar not surrounding the axillary buds. 63. 
63. Bark verv spicv- aromatic, fragrant; buds often stalked and clus- 
tered. ■ BENZOIN. 
