407. Sepals valvate in bud, very rarely at first imbricate; in this case many ovules in each ovary-cell and leaves undivided. Disc wanting. Leaves stipulate. =144. Sterculiaceae.= Sepals imbricate in bud. Ovules few in each ovary-cell, rarely many, but then leaves pinnate. Disc usually distinctly developed. Leaves exstipulate. Shrubs or trees. =118. Meliaceae.= 408. Ovary distinctly stalked, entire. Seeds exalbuminous; embryo curved. =87. Capparidaceae.= Ovary sessile or nearly so. 409 409. Calyx with valvate aestivation. Disc wanting. Leaves stipulate. =141. Tiliaceae.= Calyx with imbricate, contorted, or open aestivation. 410 410. Calyx with contorted aestivation. Disc wanting. Leaves undivided. Seeds albuminous; embryo curved. =154. Cistaceae.= Calyx with imbricate, not contorted, or with open aestivation. Disc ring-, cushion-, or cup-shaped. 411 411. Disc outside the stamens. Flowers usually irregular. Seeds with a copious albumen and straight embryo. Shrubs or trees. =135. Melianthaceae.= Disc within the stamens. Flowers regular. 412 412. Leaves with translucent dots, exstipulate. =115. Rutaceae.= Leaves without dots, stipulate. =113. Zygophyllaceae.= 413. (405.) Anthers opening by 1-2 apical pores. Leaves opposite or whorled, exstipulate. =181. Melastomataceae.= Anthers opening by 2 longitudinal slits. 414 414. Calyx with valvate aestivation. =173. Lythraceae.= Calyx with imbricate aestivation. Stamens 10. Ovary 3-celled. Shrubs or trees. Leaves alternate, exstipulate. 415 415. Flowers polygamous, without bracteoles. Calyx shortly lobed. Filaments free. Anthers attached by the base. Fruit indehiscent. Leaves with translucent dots. _Psiloxylon_, =180. Myrtaceae=. Flowers hermaphrodite. Calyx deeply divided. Anthers attached by the back. Fruit dehiscing loculicidally. Leaves without dots. _Asteropeia_, =148. Theaceae=. 416. (404.) Petals and stamens hypogynous. 417 Petals, and usually also the stamens, perigynous. 433 417. Stipules present, but sometimes minute and caducous. 418 Stipules wanting, but axillary spines sometimes present. 428 418. Calyx with valvate, closed, or open aestivation. 419 Calyx with imbricate or contorted aestivation. 425 419. Corolla with valvate aestivation. 420 Corolla with imbricate or contorted aestivation. 421 420. Petals toothed or laciniate. Anthers opening by a single pore or slit at the apex. Trees. Leaves undivided. _Elaeocarpus_, =139. Elaeocarpaceae=. Petals entire or emarginate. Anthers opening by 2 pores or slits. =141. Tiliaceae.= 421. Ovary distinctly stalked. Stigma usually sessile. Petals with imbricate, not contorted aestivation. Seeds exalbuminous. =87. Capparidaceae.= Ovary sessile or nearly so. Petals usually with contorted aestivation. 422 422. Anthers 1-celled, opening by 1 slit or pore. Filaments united. Petals 5. 423 Anthers 2-celled, opening by 2, rarely confluent slits or pores. 424