CHORIPETALAE 39 



Corolla with imbricate or open aestivation ; in the latter case calyx val- 

 vate. Seeds exalbuminous, rarely with scanty albumen, but then leaves 

 digitate 435 



435. Anthers opening by a single slit. Filaments united. Ovary 5 — 10- 



celled, slightly sunk in the receptacle. Petals 5, with contorted aestiva- 

 tion. Seeds albuminous. Leaves digitate, stipulate. Trees. 



143. Bombacaceae. 

 Anthers opening by 2 slits. Seeds exalbuminous. Leaves undivided, 



rarely digitate, but then ovary stalked and 2-celled 436 



436. Ovary stalked, 2-celled. Embryo curved. Leaves alternate. 



87. Capparidaceae. 

 Ovary sessile. Embryo straight. Leaves undivided, usually oppo- 

 site 437 



437. Ovary 2 — 6-celled 173. Lythraceae. 



Ovary 10 — 20-celled. Ovules inserted upon the dissepiments. Petals 



linear. Trees or shrubs. Leaves opposite, exstipulate. 



Sonneratia, 174. Sonneratiaceae. 



438. Calyx and corolla with contorted aestivation. Petals 5 — 6. Disc pre- 



sent. Ovary 3-celled. Style present. Trees or shrubs. Leaves alter- 

 nate, not peltate 140. Chlaenaceae. 



Calyx and corolla with imbricate, not contorted aestivation. Petals 

 numerous. Disc wanting. Ovary 6- or more-celled. Style wanting. 

 Herbs. Leaves all radical, floating, peltate. 



Nymphaea, 76. Nymphaeaceae. 



439- (389-) Stamens as many or twice as many as the petals, 3 — 10. . . 440 



Stamens numerous 446 



440. Petals and stamens perigynous or inserted at the base of an hypogynous 



disc. Stamens 8 or 10. Styles free. Seeds albuminous. . . 441 

 Petals and stamens hypogynous. Disc wanting 442 



441. Stem herbaceous. Leaves usually radical or alternate and exstipulate. 



Placentas thick. Saxifraga, 96. Saxifragaceae. 



Stem woody. Leaves opposite or whorled, stipulate. Ovules in two rows. 



98. Cunoniaceae. 



442. Leaves opposite or whorled, undivided, stipulate. Filaments free. 



Styles free. Seeds exalbuminous. Herbs or undershrubs. 



151. Elatinaceae. 

 Leaves alternate or all radical 443 



443. Sepals united below, valvate in bud. Leaves stipulate. 



144. Sterculiaceae. 

 Sepals free or nearly so, imbricate in bud 444 



444. Ovary-cells and styles 5. Petals with contorted aestivation. Seeds 



albuminous 108. Oxalidaceae. 



Ovary-cells and styles or style-branches 3. Stamens 10. Trees or 

 shrubs. Leaves undivided 445 



