Flowers hermaphrodite, solitary or fascicled in the axils of the leaves. Perianth irregular. Stamens adnate to the style. Fruit a capsule. Embryo with 2 cotyledons. Leaves well developed, green. _Aristolochia_, =63. Aristolochiaceae=. 186. Flowers unisexual, in cymes. Perianth irregular. Stamens numerous. Styles 2-6, free or united at the base. Leaves stipulate. _Begonia_, =165. Begoniaceae=. Flowers hermaphrodite, solitary or in racemes or heads. Perianth regular. Style 1, undivided. 187 187. Stamens 3-6. Leaves stipulate. Herbs. _Ludwigia_, =182. Oenotheraceae=. Stamens numerous. Leaves exstipulate. Trees or shrubs. =176. Lecythidaceae=. 188. (53.) Ovary superior or nearly so. 189 Ovary inferior to half-inferior. 481 189. Ovary 1, entire or lobed. 190 Ovaries 2 or more, separate or united at the base only. 451 190. Ovary 1-celled, sometimes with incomplete partitions or containing one or more empty rudimentary cells besides the fertile one. 191 Ovary completely or almost completely 2-or more-celled, the partitions sometimes not quite reaching the apex; or one cell only fertile, the others empty but well developed. 273 191. Ovule 1. 192 Ovules 2 or more. 214 192. Ovule erect or ascending or attached by a basal funicle. 193 Ovule pendulous or descending. 205 193. Leaves stipulate. Sepals 5. 194 Leaves exstipulate. 198 194. Stigma 1, entire. 195 Stigma 1, five-lobed, or stigmas 2-3. Stamens 1-5, more or less distinctly perigynous. Flowers regular. Leaves undivided. 197 195. Flowers regular. Corolla with imbricate or contorted aestivation. Stamens 4-5, hypogynous. Shrubs or trees. Leaves opposite, undivided. _Dovera_, =131. Salvadoraceae=. Flowers irregular, rarely regular, but then leaves alternate and corolla with valvate aestivation or stamens more than 5. Stamens more or less distinctly perigynous. 196 196. Style basal or nearly so. =103. Rosaceae.= Style terminal or nearly so. Stamens 9-10. =105. Leguminosae.= 197. Stigma 5-lobed. Calyx valvate in bud. Seeds exalbuminous. Shrubs or trees. _Maesopsis_, =137. Rhamnaceae=. Stigmas 2-3. Seeds albuminous. =75. Caryophyllaceae.= 198. Sepals 2, free or nearly so. 199 Sepals 3-7, free or more or less united, or an entire calyx. 201 199. Flowers unisexual. Stamens 8-10. Style 3-4-cleft. Trees. Leaves undivided. _Didierea_, =134. Sapindaceae=. Flowers hermaphrodite. Stamens 2-7. Herbs or shrubs. 200 200. Corolla regular. Stamens 4-7, free or nearly so. Style 3-parted. Embryo large, curved. Shrubs. Leaves undivided. _Portulacaria_, =73. Portulacaceae=. Corolla irregular. Stamens 2, three-cleft (or 6, united in 2 bundles). Style simple. Embryo small. Herbs. Leaves dissected. =86. Papaveraceae.= 201. Stamens numerous. Style 1. Corolla with imbricate or contorted aestivation. Leaves opposite. Shrubs or trees. _Calophyllum_, =149. Guttiferae=. Stamens 1-10, rarely more, but then styles 3 or corolla with valvate aestivation. 202