150b. Ovary inferior, appearing as a swelling below the calyx at the apex of the pedicel --151. 151a. Flowers in racemes or solitary 42b, in =ROSACEAE=, p. 55. 151b. Flowers in flattened or rounded branching clusters 42a, in =ROSACEAE=, p. 55. 152a. Stems thorny 1a, in =RUTACEAE=, p. 65. 152b. Stems not thorny --153. 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 1a, in =LAURACEAE=, p. 41. 154b. Flowers in peduncled terminal clusters 1b, 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 1a, in =RUBIACEAE=, p. 108. 161c. Flowers not in dense heads, and not subtended by petal-like bracts --162. 162a. Petals separate from each other --163. 162b. Petals united with each other --164. 163a. Flowers dark purple-red 1b, in =CELASTRACEAE=. p. 69. 163b. Flowers bright yellow 1a, in =HYPERICACEAE=, p. 73. 163c. Flowers pink-purple; aquatic shrubs 1a, in =LYTHRACEAE=, p. 77. 163d. Flowers white 5, in =CORNACEAE=, p. 83. 163e. Flowers minute, greenish; twigs usually thorny 1b, in =RHAMNACEAE=, p. 71. 163f. Flowers small, yellowish; leaves silvery beneath =ELAEAGNACEAE=, p. 77. 164a. Stamens 2 1a, in =OLEACEAE=, p. 88. 164b. Stamens 4 or 5 11, in =CAPRIFOLIACEAE=, p. 110. 164c. Stamens 10 18a, in =ERICACEAE=, p. 85. 165a. Leaves once-compound --166. 165b. Leaves simple --172.