360. Sepals free. Petals and stamens hypogynous. Anthers opening by an apical pore. _Elaeocarpus_, =139. Elaeocarpaceae=. Sepals united below. Petals and stamens more or less perigynous. Anthers opening by two longitudinal slits. 361 361. Calyx entire or nearly so. Leaves alternate. =145. Scytopetalaceae.= Calyx more or less deeply divided. Leaves opposite or whorled. =177. Rhizophoraceae.= 362. Calyx with valvate aestivation. 363 Calyx with imbricate aestivation. 366 363. Leaves exstipulate, undivided, opposite. Ovules ascending or horizontal. Seeds exalbuminous. =149. Guttiferae.= Leaves stipulate. Petals 5. 364 364. Filaments free. Anthers opening by two slits. =141. Tiliaceae.= Filaments evidently united. 365 365. Anthers opening by a single slit. =142. Malvaceae.= Anthers opening by two slits. Stigmas 3 or 5. _Dombeya_, =144. Sterculiaceae=. 366. Stem herbaceous or woody at the base. 367 Stem woody throughout. Leaves undivided. 368 367. Sepals and petals with contorted aestivation. Ovary 3-celled. Stigmas 1-3. Fruit opening loculicidally. Leaves entire. =154. Cistaceae.= Sepals and petals with imbricate aestivation. Stamens 15. Ovary 5-celled. Stigmas 5. Fruit opening septicidally. Leaves stipulate. =107. Geraniaceae.= 368. Leaves stipulate. 369 Leaves exstipulate. 370 369. Sepals 3, surrounded by a 3-5-toothed involucre. Disc cup-shaped. Fruit dehiscent. _Sarcochlaena_, =140. Chlaenaceae=. Sepals 5. Disc wanting. Fruit indehiscent. =150. Dipterocarpaceae.= 370. Leaves alternate. Ovules pendulous. =148. Theaceae.= Leaves opposite. Ovules ascending or horizontal. =149. Guttiferae.= 371. (320.) Stamens as many to twice as many as petals, 4-12. 372 Stamens more than twice as many as petals. 382 372. Filaments free. 373 Filaments obviously united, at least at the base. 377 373. Stipules present, but sometimes very small and caducous. 374 Stipules wanting, but axillary spines sometimes present. 376 374. Leaves opposite or whorled. Flowers hermaphrodite. Stamens 8-10. =98. Cunoniaceae.= Leaves alternate. 375 375. Style 1, 2-3-cleft, with undivided branches. Stamens 5. Disc present. Sepals imbricate in bud. Petals usually 2-cleft. Fruit a drupe or nut. Seeds exalbuminous. _Dichapetalum_, =121. Dichapetalaceae=. Styles 2, 3, or 5, free or united at the base, usually 2-cleft. Flowers unisexual. Fruit usually a capsule. =122. Euphorbiaceae.= 376. Leaves with glandular dots. Petals 4-5. Stamens as many or twice as many. =115. Rutaceae.= Leaves without glandular dots, lobed, opposite. Petals 5. Stamens 8, inserted at the inner edge of the disc. Ovary-cells and style-branches 2. _Acer_, =133. Aceraceae=. 377. Flowers unisexual. Stamens as many as and alternate with the petals. Leaves alternate, undivided, stipulate. =122. Euphorbiaceae.= Flowers hermaphrodite, rarely polygamous. 378 378. Sepals valvate in bud, united below. Leaves alternate, stipulate. =144. Sterculiaceae.= Sepals imbricate in bud. 379