Sepals 2-4, rarely more, but then with imbricate, open, or closed aestivation. Ovules axile. 545 545. Leaves alternate, rarely dotted. Sepals 2-4. Filaments united into a cup at the base. =176. Lecythidaceae.= Leaves opposite, gland-dotted. =180. Myrtaceae.= 546. (537.) Stamens 2-10. 547 Stamens numerous. 548 547. Stamens fewer than the petals, at least apparently (by coalescence), more rarely as many as the petals, but then, as usually, tendril-bearing herbs. Styles usually 3. Flowers 5-merous, unisexual or polygamous. Fruit more or less berry-like. Seeds exalbuminous. =223. Cucurbitaceae.= Stamens as many as the petals, 4-5, and then styles 2 and stem woody, or twice as many. Fruit capsular. Seeds albuminous, rarely exalbuminous, but then flowers 4-merous. =96. Saxifragaceae.= 548. Petals 3-5. Seeds exalbuminous. 549 Petals numerous. Seeds albuminous. Herbs or undershrubs. 550 549. Flowers unisexual. Sepals and petals not distinctly differentiated, together 8-9. Ovules many in each ovary-cell. _Begonia_, =165. Begoniaceae=. Flowers hermaphrodite. Sepals and petals distinctly differentiated, together 10. Ovules few in each ovary-cell. Shrubs. _Cydonia_, =103. Rosaceae=. 550. Sepals nearly hypogynous, 4. Ovules inserted upon the dissepiments. Fruit bursting irregularly. Embryo straight. Leaves radical, floating, peltate or cordate. Flowers solitary. _Nymphaea_, =76. Nymphaeaceae=. Sepals epigynous, usually 5. Ovules basal or parietal. Fruit opening loculicidally. Embryo curved. Leaves not floating. Flowers in cymes or panicles. _Mesembryanthemum_, =72. Aizoaceae=. 551. (52.) Ovary superior or nearly so. 552 Ovary inferior to half-inferior. 728 552. Ovary 1, entire or lobed. 553 Ovaries 2 or more, separate or cohering at the base only. 719 553. Ovary 1-celled, sometimes incompletely chambered. 554 Ovary completely or almost completely 2-or more-celled, at least at the time of flowering (sometimes incompletely septate in the bud). 604 554. Ovule 1. 555 Ovules 2 or more. 570 555. Ovule erect or ascending. 556 Ovule pendulous or descending. Style simple. 564 556. Style 1, entire or cleft at the top into 2 or more stigmas (or branches stigmatose on the inside). 557 Styles 3-5, free or united at the base. Stamens 5, opposite the petals. 563 557. Stamens free from the corolla or inserted on its base. 558 Stamens inserted on the upper part or near the middle of the corolla. 561 558. Corolla (or corolla-like perianth) with valvate or folded aestivation. Leaves exstipulate. =69. Nyctaginaceae.= Corolla with imbricate or open aestivation; in the latter case leaves stipulate. Stamens as many as the divisions of the corolla. 559 559. Flowers 5-merous. Stigmas 3. Herbs. Leaves opposite, stipulate. _Cometes_, =75. Caryophyllaceae=. Flowers 4-merous. Stigma 1. 560 560. Flowers unisexual, solitary or in fascicles. Seeds albuminous. Herbs. Leaves all radical, exstipulate. _Litorella_, =218. Plantaginaceae=.