XX 



153a. Bark pleasantly aromatic when crushed; perianth with 6 



parts 154. 

 153b. Bark not pleasantly aromatic; perianth with 4 short lobes 



THYMELAEACEAE, p. 77. 



154a. Flowers in sessile lateral clusters 



la, in LAURACEAE, p. 41. 

 154b. Flowers in peduncled terminal clusters 



Ib, in LAURACEAE, p. 41. 



155 



155a. Leaves narrow, needle-like or scale-like, mostly evergreen 54. 

 155b. Leaves broader, flat or rolled, but not needle-like or scale-like 

 156. 



156a. Twining or climbing vines 56. 

 156b. Not twining or climbing 157. 



157a. Leaves opposite 158. 

 157b. Leaves alternate 165. 



158a. Leaves compound 68. 

 158b. Leaves simple 159. 

 159a. Leaves broad, palmately lobed 160. 

 159b. Leaves not palmately lobed 161. 



160a. Flowers greenish-yellow, in racemes or panicles 



2a, in ACERACEAE, p. 70. 

 160b. Flowers white, in rounded or flattened clusters 



22a, in CAPRIFOLIACEAE, p. 111. 



161a. Flowers in close clusters, subtended by four large white petal- 

 like bracts 4b, in CORNACEAE, p. 83. 

 161b. Flowers small, white, in dense spherical heads 



la, in RUBIACEAE, p. 108. 

 161c. Flowers not in dense heads, and not subtended by petal-like 



bracts 162. 



162a. Petals separate from each other 168. 

 162b. Petals united with each other 164. 



163a. Flowers dark purple-red Ib, in CELASTRACEAE, p. 69. 



163b. Flowers bright yellow la, in HTPERICACEAE, p. 73. 



163c. Flowers pink-purple; aquatic shrubs 



la, in LTTHRACEAE, p. 77. 



163d. Flowers white 5, in CORtfACEAE, p. 83. 



163e. Flowers minute, greenish; twigs usually thorny 



Ib, in RHAMNACEAE, p. 71. 

 163f. Flowers small, yellowish; leaves silvery beneath 



ELAEAGIVACEAE, p. 77. 



16 la. Stamens -2 la, in OLEACEAE, p. 88. 



164b. Stamens 4 or 5 11, in CAPRIFOLIACEAE, p. 110. 



164c. Stamens 10 18a, in ERICACEAE, p. 85. 



