45. 
46. 
47. 
48. 
49. 
50. 
51. 
52. 
D3. 
54. 
55. 
56. 
57. 
58. 
59. 
60. 
61. 
KEYS—LEAVES OPPOSITE XV 
Leaves pinnate, frequently alternate. p. 148. Sophora. 
Leaves simple. 46. 
Bundle-traces three. 47. 
Bundle-traces 7: stipules forming a sheath. p. 345. Gardenia. 
Pith uniform and continuous. p. 349. Viburnum. 
Pith gritty, finally chambered. p. 364. Aucuba. 
Pith spongy or finally excavated. 49. 
Pith characteristically continuous and persistent. 53. 
Leaf-scars raised, or else buds superposed. 50. 
Leaf-scars little raised: buds not superposed. 52. 
Buds sessile. 51. 
Buds slightly stalked: tender. p. 356. Leycesteria. 
Buds never superposed. p. 352. Symphoricarpos. 
Buds often superposed. p. 353. Lonicera. 
Pith spongy, or lower bud-scales short. p. 77. Deutzia. 
Pith excavated: lower scales as long as bud. p. 347. Dipelta. 
Buds behind a persistent petiole-base. p. 262. Cornus. 
Buds covered by a broad membrane. p. 74. Philadelphus. 
Buds exposed. 54. 
Buds enclosed in a single outer scale or sac. 55. 
Buds naked, or with separate scales. 57. 
Seale 1, split in front. p. 49. Cercidiphyllum. 
Scales 2, united in a closed sae. 56. 
-With evident stipule-scars. p. 201. Staphylea. 
Without stipule-scars. p. 349. Viburnum. 
Most leaf-scars alternate: buds silvery. p.148. Laburnum. 
Without this combination of characters. 58. 
Leaf-scars ciliate at top. 59. 
Leaf-scars not ciliate. 61. 
Buds solitary over each leaf-scar. 60. 
Buds often collaterally multiplied. p. 112. Rhodotypos. 
Buds essentially sessile. p. 202. Acer. 
Buds slightly but evidently stalked. p. 349. Viburnum. 
Twigs with 2 or 4 often hairy raised lines. p. 348. Diervilla. 
Twigs not ridged when fresh. 62. 
