393. Ovary 2-celled. Stamens 6, rarely 2 or 4. Sepals 4, petals 4. Receptacle with glands. Leaves simple, without stipules, but often with auricles at the base. =88. Cruciferae.= Ovary 3-or more-celled. Stamens 4-5. 394 394. Sepals valvate in bud, united below. Filaments usually united. Disc wanting. Leaves stipulate. 395 Sepals imbricate or open in bud, free or nearly so, rarely evidently united, but then leaves exstipulate. Filaments free; anthers sometimes united. 396 395. Anthers opening by 1 slit. Leaves palmately compound. Trees. _Ceiba_, =143. Bombacaceae=. Anthers opening by 2 slits or pores. Leaves simple. =144. Sterculiaceae.= 396. Anthers united, opening at the apex. Stamens 5. Disc wanting. Petals 3 or 5. Sepals 3 or 5, one of them spurred. Herbs. Leaves undivided, exstipulate. _Impatiens_, =136. Balsaminaceae=. Anthers free, opening lengthwise. 397 397. Flowers irregular. Stamens usually fewer than the petals. Disc present. Ovary 4-5-celled. Albumen abundant. Shrubs or trees. Leaves alternate, pinnate. _Melianthus_, =135. Melianthaceae=. Flowers regular. Stamens as many as the petals. Albumen scanty or wanting. 398 398. Disc present. Leaves stipulate, usually opposite or compound. =113. Zygophyllaceae.= Disc wanting. Staminodes in bundles alternating with the fertile stamens. Sepals united below. Leaves exstipulate, alternate, undivided. _Thomassetia_, =148. Theaceae=. 399. (391.) Calyx with valvate aestivation. Seeds exalbuminous; embryo straight. =173. Lythraceae.= Calyx with imbricate or open aestivation. 400 400. Stem herbaceous. Leaves without glandular dots, exstipulate. Sepals 4. Petals 4. Stamens 6. Ovary 2-celled. _Subularia_, =88. Cruciferae=. Stem woody. Stamens 3-5, very rarely 6-8, but then sepals 5 and petals 5. 401 401. Leaves with glandular dots, alternate, exstipulate. Stamens 5-8. Ovary 2-3-celled. Seeds exalbuminous. _Heteropyxis_, =180. Myrtaceae=. Leaves without glandular dots. Stamens 3-5. Ovary 3-7-celled. 402 402. Leaves opposite, rarely alternate and then, as usually, stamens 3. Stamens inserted upon the disc. Filaments dilated. Ovary 3-celled. Seeds exalbuminous. =130. Hippocrateaceae.= Leaves alternate. Stamens 4-5, inserted below the edge of the disc. Seeds albuminous. 403 403. Leaves stipulate. Ovary 3-5-celled. Fruit a capsule. Seeds with an aril. =129. Celastraceae.= Leaves exstipulate. Ovary 5-7-celled. Fruit a drupe. Seeds without an aril. _Brexia_, =96. Saxifragaceae.= 404. (390.) Stamens twice as many as the petals. 405 Stamens more than twice as many as the petals. 416 405. Petals and stamens hypogynous. 406 Petals, and usually also the stamens, perigynous. Leaves undivided. 413 406. Filaments united in a tube, at least at the base. 407 Filaments free, rarely (_Rutaceae_) united in several bundles. 408