342. Sepals 4. Petals 4. Stamens 6. Ovary 2-celled or transversally septate. Stigmas 1-2. Leaves exstipulate. =88. Cruciferae.= Sepals 5. Ovary 5-celled. Stigmas 5. Leaves stipulate. =107. Geraniaceae.= 343. (339.) Stamens twice as many as the petals. 344 Stamens more than twice as many as the petals. 359 344. Filaments free. 345 Filaments evidently united, at least at the base. 354 345. Calyx with valvate aestivation. 346 Calyx with imbricate aestivation. 349 346. Leaves gland-dotted, without stipules, but sometimes with axillary spines. =115. Rutaceae.= Leaves not gland-dotted, usually with stipules. 347 347. Leaves opposite or whorled, undivided, stipulate. Petals valvate in bud. Stamens perigynous. Shrubs or trees. =177. Rhizophoraceae.= Leaves alternate. 348 348. Leaves simple, stipulate. Stamens hypogynous. =141. Tiliaceae.= Leaves compound, more rarely simple, but then, as usual, exstipulate. Shrubs or trees. =117. Burseraceae.= 349. Stipules present, but sometimes very small and caducous. 350 Stipules wanting, but axillary spines sometimes present. 352 350. Sepals 3, surrounded by a 6-toothed involucre. Petals 5. Disc cup-shaped. Trees or shrubs. Leaves alternate, undivided. _Leptochlaena_, =140. Chlaenaceae=. Sepals 4-6. Disc ring-or cushion-shaped or reduced to separate scales or wanting. 351 351. Stigma 1, entire or lobed. Filaments usually provided with an appendage. Leaves usually compound. =113. Zygophyllaceae.= Stigmas 5. Filaments without an appendage. Leaves simple, but sometimes dissected. Fruit beaked, splitting into 5 nutlets. =107. Geraniaceae.= 352. Flowers irregular, 4-merous. Disc outside the stamens, one-sided, sometimes indistinct. Ovary 2-3-celled. Leaves pinnate. =134. Sapindaceae.= Flowers regular. 353 353. Bark resinous. Leaves rarely dotted. Ovules pendulous or laterally attached. Fruit drupe-like, but sometimes dehiscing. Seeds exalbuminous. =117. Burseraceae.= Bark not resinous. Leaves gland-dotted. Ovules usually ascending. =115. Rutaceae.= 354. (344.) Sepals valvate in bud, united below. Leaves stipulate. 355 Sepals imbricate in bud. 356 355. Leaves opposite or whorled. Petals toothed or slit, valvate in bud. =177. Rhizophoraceae.= Leaves alternate. Petals nearly always imbricate in bud. =144. Sterculiaceae.= 356. Stigmas 5. Ovary lobed. Sepals and petals imbricate in bud. Herbs or undershrubs. Leaves simple, stipulate. =107. Geraniaceae.= Stigmas 1-3. Shrubs or trees. 357 357. Leaves stipulate, undivided. Petals with contorted aestivation. Disc wanting. =110. Linaceae.= Leaves exstipulate. Stigma 1, entire or lobed. 358 358. Leaves simple, undivided. Ovary 3-celled. Disc wanting. _Asteropeia_, =148. Theaceae=. Leaves compound, more rarely simple, but then ovary 4-20-celled. Disc usually present. =118. Meliaceae.= 359. (343.) Petals with valvate aestivation. Trees or shrubs. 360 Petals with imbricate or contorted aestivation. 362