310. Sepals united into a minute, entire or toothed calyx. Petals 4-6, valvate in bud. Ovary 3-4-celled. Seeds with abundant albumen. =59. Olacaceae.= Sepals free or united at the base only. Seeds without albumen. 311 311. Petals 5, imbricate in bud. Ovary 2-3-celled. =119. Malpighiaceae.= Petals 8-10, rarely 4-5, scale-like, valvate in bud. Sepals free, petaloid. Ovary 4-5-celled. _Octolepis_, =171. Thymelaeaceae=. 312. (305.) Stamens numerous. Anthers opening by one slit. Calyx with valvate aestivation. Seeds with curved embryo. Leaves simple, stipulate. =142. Malvaceae.= Stamens twice as many as the petals, 6-12, rarely (_Malpighiaceae_) a few more (11-15). Anthers opening by two slits. Calyx with imbricate or open aestivation. 313 313. Style 1, undivided with a single stigma or with two or more stigmas contiguous at the base. 314 Styles 2-5, free or more or less united with separate (not contiguous) stigmas. Stamens 10, rarely 11-15. 316 314. Leaves compound, exstipulate. Seeds without albumen. =118. Meliaceae.= Leaves simple, undivided. Stamens 10. 315 315. Ovary 5-celled. Disc present. Seeds albuminous. Trees. Leaves exstipulate. _Saccoglottis_, =111. Humiriaceae=. Ovary 2-3-celled. Disc wanting. Shrubs or undershrubs. 316 316. Seeds albuminous. Flowers in axillary fascicles. Leaves alternate, stipulate. _Nectaropetalum_, =110. Linaceae=. Seeds exalbuminous. Flowers in racemose inflorescences, rarely solitary. Sepals usually with glands on the outside. =119. Malpighiaceae.= 317. Styles and ovary-cells 5. Herbs or undershrubs, rarely shrubs. =108. Oxalidaceae.= Styles and ovary-cells 2-4. Trees or shrubs, rarely undershrubs. Leaves undivided. 318 318. Flowers solitary or in fascicles. Petals with a scale on the inside. Styles or style-branches 3-4. Fruit a drupe. Seeds usually albuminous. Leaves alternate, stipulate. _Erythroxylon_, =112. Erythroxylaceae=. Flowers in racemose inflorescences. Sepals usually with glands on the outside. Styles or style-branches 2-3. Seeds exalbuminous. =119. Malpighiaceae.= 319. (273.) Ovules 2 in each ovary-cell. 320 Ovules 3 or more in each ovary-cell. 389 320. Style 1, undivided, or 2 or more styles united to the base of the stigmas, or 1 sessile stigma. 321 Styles 2 or more, free or united below, but not up to the base of the stigmas, or 2 or more free sessile stigmas. 371 321. Stamens as many as or fewer than the petals. 322 Stamens more than the petals. 339 322. Stamens as many as and opposite to the petals. 323 Stamens as many as and alternate with the petals, or fewer. 325 323. Stamens 10. Ovary 10-celled. Herbs. Leaves opposite. _Augea_, =113. Zygophyllaceae=. Stamens 3-7. Leaves alternate. 324 324. Petals with valvate aestivation. Filaments free. Ovary 2-celled. Fruit a berry. =138. Vitaceae.= Petals with imbricate-contorted aestivation. Filaments more or less united. Ovary 3-or more-celled. Fruit a capsule. =144. Sterculiaceae.= 325. Stamens 2-4. 326 Stamens 5. 333