KEYS LEAVES OPPOSITE xv 



45. Leaves pinnate, frequently alternate. p. 143. Sophora. 

 Leaves simple. 46. 



46. Bundle-traces three. 47. 



Bundle-traces 7: stipules forming a sheath, p. 345. Gardenia. 



47. Pith uniform and continuous. p. 349. Viburnum. 

 Pith gritty, finally chambered. p. 364. Aucuba. 



48. Pith spongy or finally excavated. 49. 



Pith characteristically continuous and persistent. 53. 



49. Leaf-scars raised, or else buds superposed. 50. 

 Leaf-scars little raised: buds not superposed. 52. 



50. Buds sessile. 51. 



Buds slightly stalked: tender. p. 356. Leycesteria. 



51. Buds never superposed. p. 352. Symphoricarpos. 

 Buds often superposed. p. 353. Lonicera. 



52. Pith spongy, or lower bud-scales short. p. 77. Deutzia. 

 Pith excavated: lower scales as long as bud. p. 347. Dipelta. 



53. Buds behind a persistent petiole-base. p. 262. Cornus. 

 - Buds covered by a broad membrane, p. 74. Philadelphus. 



Buds exposed. 54. 



54. Buds enclosed in a single outer scale or sac. 55. 

 Buds naked, or with separate scales. 57. 



55. Scale 1, split in front. p. 49. Cercidiphyllum. 

 Scales 2, united in a closed sac. 56. 



56. With evident stipule-scars. p. 201. Staphylea. 

 Without stipule-scars. p. 349. Viburnum. 



57. Most leaf-scars alternate: buds silvery, p. 148. Laburnum. 

 Without this combination of characters. 58. 



58. Leaf-scars ciliate at top. 59. 

 Leaf-scars not ciliate. 61. 



59. Buds solitary over each leaf-scar. 60. 



Buds often collaterally multiplied. p. 112. Rhodotypos. 



60. Buds essentially sessile. p. 202. Acer. 

 Buds slightly but evidently stalked. p. 349. Viburnum. 



61. Twigs with 2 or 4 often hairy raised lines, p. 348. Diervilla. 

 Twigs not ridged when fresh. 62. 



