Sepals 3-5, valvate or open in bud. Leaves stipulate. 450 450. Anthers opening by a single slit or pore. =142. Malvaceae.= Anthers opening by two slits or pores. =144. Sterculiaceae.= 451. (189.) Styles united below or throughout their whole length. 452 Styles entirely free or loosely cohering above. 457 452. Anthers 1-celled, opening by a single slit. Stamens numerous. Filaments united. Disc not distinctly developed. Calyx with valvate aestivation. Seeds albuminous. Leaves simple, stipulate. =142. Malvaceae.= Anthers 2-celled, opening by 2 slits or pores. Calyx with imbricate, more rarely with open or valvate aestivation, in the latter case leaves exstipulate. 453 453. Ovules solitary in each carpel. Trees or shrubs. 454 Ovules 2 or more in each carpel. Leaves exstipulate. 456 454. Receptacle more or less elongated. Stamens 10 or more. Fruits drupaceous. Seeds exalbuminous. Leaves undivided, stipulate. =147. Ochnaceae.= Receptacle expanded into a disc. Leaves exstipulate. 455 455. Stamens inserted within the disc. Ovules ascending. =134. Sapindaceae.= Stamens inserted outside the disc. =116. Simarubaceae.= 456. Sepals 3. Petals 6. Stamens numerous. Trees or shrubs. =81. Anonaceae.= Sepals 4-5. Petals 4-5. Stamens 4-10. Leaves translucently dotted. =115. Rutaceae.= 457. (451.) Ovules solitary in each carpel. 458 Ovules 2 or more in each carpel. 470 458. Leaves opposite, exstipulate. 459 Leaves alternate or the uppermost whorled, or all radical. 462 459. Stamens 3-10. Carpels 3-9. Albumen scanty. Leaves undivided. 460 Stamens numerous. Carpels 2 or many. Albumen abundant. 461 460. Stamens 3-9. Petals white or reddish. Fruit dehiscent. _Crassula_, =95. Crassulaceae=. Stamens 10. Petals greenish, fleshy. Fruit indehiscent. Shrubs. Flowers in racemes. _Coriaria_, =126. Coriariaceae=. 461. Carpels 2. Ovules ascending. Sepals 5. Petals 5. Seeds with an aril. Erect shrubs or trees. Leaves undivided. _Hibbertia_, =146. Dilleniaceae=. Carpels numerous. Ovules pendulous. Seeds without an aril. _Clematis_, =78. Ranunculaceae=. 462. Leaves stipulate. 463 Leaves exstipulate. 467 463. Stamens as many as the petals, 3-8, hypogynous or nearly so. Styles terminal. Flowers unisexual. 464 Stamens twice as many as the petals or more, rarely as many as the petals or fewer, but then distinctly perigynous and styles basal. Ovules inverted. 465 464. Stem erect, tree-like. Leaves lobed. Flowers in heads. Ovules pendulous, straight. Fruit dry. _Platanus_, =102. Platanaceae=. Stem climbing. Leaves undivided. Flowers in racemes or panicles. Ovules laterally affixed, half-inverted. Fruit fleshy. _Tiliacora_, =80. Menispermaceae=. 465. Petals and stamens perigynous. =103. Rosaceae=. Petals and stamens hypogynous. Leaves undivided. 466 466. Flowers regular. Sepals 3-4, valvate in bud. Stamens numerous, with united filaments. Disc absent. Trees. _Christiania_, =141. Tiliaceae=.