507. (481.) Ovules solitary in each ovary-cell. 508 Ovules two or more in each ovary-cell. 527 508. Ovules erect or ascending. 509 Ovules pendulous or descending. 513 509. Stamens 10 or more. Sepals 5. Petals 5. Ovary 4-10-celled. Styles or style-branches 2-10. Shrubs or trees. Leaves stipulate. =103. Rosaceae.= Stamens 2-5. 510 510. Flowers 2-merous. Herbs. Leaves opposite, exstipulate. _Circaea_, =182. Oenotheraceae=. Flowers 4-5-merous. 511 511. Stamens, at least apparently (by coalescence), fewer than the petals, 3. Sepals 5. Petals 5. Ovary-cells and stigmas 3. Flowers unisexual. Tendril-bearing herbs. Leaves alternate. _Cayaponia_, =223. Cucurbitaceae=. Stamens as many as the petals, 4-5. Shrubs or trees, rarely undershrubs. 512 512. Stamens alternating with the petals. Calyx with imbricate or open aestivation. =129. Celastraceae.= Stamens opposite the petals. Calyx with valvate aestivation. =137. Rhamnaceae.= 513. (508.) Ovary 2-celled. 514 Ovary 3-15-celled. 522 514. Style 1, with a single stigma. Flowers 4-merous. 515 Style 1, with 2-3 stigmas, or styles 2. 517 515. Stamens numerous. Flowers hermaphrodite, in cymes. Fruit a berry. Seeds exalbuminous. Trees or shrubs. Leaves opposite. _Pimenta_, =180. Myrtaceae=. Stamens 4. 516 516. Flowers unisexual, in cymes. Fruit a drupe. Seeds albuminous. Trees or shrubs. Leaves opposite. _Cornus_, =187. Cornaceae=. Flowers hermaphrodite, solitary. Fruit a nut. Seeds exalbuminous. Herbs. Leaves radical. _Trapa_, =182. Oenotheraceae=. 517. Stamens numerous. Petals 5. Stigmas 3. Seeds exalbuminous. Leaves alternate. _Kissenia_, =164. Loasaceae=. Stamens as many as the petals. Stigmas 2. Seeds albuminous. 518 518. Fruit a capsule, rarely a nut, and then ovary half-inferior. Trees, shrubs, or undershrubs. Leaves simple, undivided. Flowers in heads or head-like spikes, rarely in racemes or panicles. 519 Fruit a schizocarp (splitting into 2 nutlets), a nut, or a drupe. Ovary inferior, rarely half-inferior, but then leaves compound or divided. Flowers in umbels, more rarely in heads, whorls, spikes, racemes, or panicles. 520 519. Leaves stipulate. Flowers usually 4-merous. Styles 2, free. Fruit a capsule. Albumen scanty. =101. Hamamelidaceae.= Leaves exstipulate, rarely stipulate, but then style 1. Flowers 5-merous. Petals clawed, imbricate in bud. Anthers opening by longitudinal slits. Albumen abundant. =100. Bruniaceae.= 520. Fruit a schizocarp splitting into two nutlets, rarely a nut, and then, as usually, stem herbaceous or woody at the base only. Flowers 5-merous. Epigynous disc usually 2-parted. Styles free. =186. Umbelliferae.= Fruit a drupe or a nut. Stem woody throughout. Epigynous disc usually entire. 521 521. Leaves compound or more or less deeply divided. Flowers in umbels, spikes, or racemes. Ovules with ventral raphe. =185. Araliaceae.=