368 The Ohio Naturalist. [Vol. V, No. 8, 



—53— 



53. Leaves with peltate scales, or resin dotted, not pinnatilid. 54. 



53. Leaves not with peltate scales, but the twigs may be resin-dotted. 55. 



54. Leaves evergreen, oblong or oblanceolate, densely covered with 



scurfy peltate scales. Chamaedaphne. 



54. Leaves deciduous; oblanceolate or wedge-lanceolate, resin-dotted 



and peltate scaly. Myrica. 



55. Pith decidedly 5-angled; leaves not fragrant; trees or shrubs. 



Quercus. 



55. Pith cylindrical or nearly so. 56. 



56. Leaves long linear-lanceolate or long linear-ol:)long; deeply pinna- 



tilid, fragrant ; twigs resin-dotted. Comptonia. 



56. Leaves not at the same time linear-lanceolate, deeply pinnatifid, 



and fragrant ; twigs not resin-dotted. 57. 



57. Climbing partly herbaceous plants with lobed leaves. Solanum. 



57. Leaves not lobed unless the plants are tall shrubs or trees. 58. 



58. With lateral thorns and sometimes with thorns at the ends of 



slender branches. 59. 



58. Not with thorns. 61. 



59. Leaves coriaceous, evergreen, hence on wood of the previous 



season. Cotoneaster. 



59. Leaves deciduous, not evergreen. 60. 



60. With typical lateral thorns but without terminal thorns; pome 



with bony carpels. Crataegus. 



60. With thorns at the ends of long slender branches and also with lat- 

 eral thorns; pome very hard, with leathery carpels. Cydonia. 



60. With thorn-like stunted branches; leaves sharply and regularly 

 serrate or nearly entire, long petioled, glabrous when mature; 

 pome with grit cells. Pyrus. 



60. With thorn-like stunted branches; leaves irregularly toothed or 



serrate, sometimes lobed ; pome without grit cells. Malus. 



61. Slender creeping evergreen shrubs with fragrant aromatic leaves. 



Gaultheria. 



61. Not creeping; leaves not aromatic. 62. 



.62. Woody twiners; vascular bundle in base of petiole 1. Celastrus. 



62. Not twining or climbing. 63. 



63. With stipules or stipular scars. 64. 



63. Without stipules or stipular scars. 70. 



64. Outer bud scales of winter buds more than 1. 65. 



64. Outer bud scale 1 ; twigs with brittle zones, hence easily detached 



and leaving peculiar self-pruning scars; terminal bud of ripe 

 branches absent ; bundle scars or vascular bundles in base of 

 petiole. 3. Salix. 



65. Leaves usually more or less heart-shaped at the base; regularly and 



sharply serrate or serrate-dentate; fruit a small berry-like pome. 



Amelanchier. 



65. Leaves acute or rounded at the base or if heart-shaped then irreg- 



ularly toothed or serrate-dentate or the leaf with long petiole 

 and acute or acuminate at the apex. 66. 



66. Axillary buds usually superposed ; leaves not mucronate or bristle- 



tipped or if so then also abruptly acuminate ; fruit a berry-like 

 drupe. Ilex. 



66. Axillary buds not superposed. 67. 



67. Leaves distinctly mucronate or bristle-tipjied, glabrous, elliptic or 



obovate; fruit a berry-like drupe. Ilicioides. 

 67. Leaves not mucronate or bristle-tipped or if so then also abruptly 

 acuminate. 68. 



