38 CHORIPETALAE 



423. Leaves simple. Flowers with an epicalyx. Filaments united to the apex 



or nearly so. Pollen-grains spiny 142. Malvaceae. 



Leaves palmately compound. Flowers without an epicalyx. Filaments 

 united below. Pollen-grains smooth or nearly so. Trees. 



143. Bombacaceae. 



424. Filaments more or less united. Staminodes present. 144. Sterculiaceae. 

 Filaments free, rarely shortly united at the base, but then staminodes 



absent 141. Tiliaceae. 



425. (418.) Calyx and corolla with contorted aestivation. Petals 5 — 6. 



Ovary sessile or nearly so. Seeds albuminous. Leaves undivided. 426 

 Calyx and corolla with imbricate, not contorted aestivation. . . 427 



426. Disc present. Ovules inverted 140. Chlaenaceae. 



Disc absent. Ovules usually straight 154. Cistaceae. 



427. Ovary sessile, 2 — 3-celled. Style awl-shaped. Ovules ascending. Seeds 



with copious albumen. Flowers regular. Leaves undivided. 



Sphaerosepaliini , 156. Cochlospermaceae. 

 Ovary stalked. Seeds without albumen. . . . 87. Capparidaceae. 



428. (417.) Leaves all radical, floating, peltate. Petals numerous. Ovary 



6- or more-celled. Stigma sessile. Seeds albuminous ; embryo straight. 



Ntiphar, 76. Nymphaeaceae. 



Leaves cauline and radical or all cauhne, not floating. Petals 4 — 5. 429 



42g. Leaves opposite. Calyx with valvate, open, or imbricate, not contorted 



aestivation. Filaments usually united in several bundles. Seeds 



exalbuminous 149. Guttiferae. 



Leaves alternate, more rarely {Cistaceae) opposite, but then calyx and 

 corolla with contorted aestivation, filaments free, and seeds albumin- 

 ous 430 



430. Leaves compound, with i — 3 leaflets, translucently dotted. Sepals united 



below. Ovary sessile, 5- or more-celled. Seeds exalbuminous. 



115. Rutaceae. 



Leaves simple, undivided, not dotted, rarely digitate or dotted, but then 



ovary stalked 431 



431. Ovary stalked. Stigma usually sessile. Disc usually present. Seeds 



exalbuminous 87. Capparidaceae. 



Ovary sessile. Disc not distinctly developed. Flowers regular. . 432 



432. Sepals and petals with contorted aestivation. Ovules usually straight. 



Seeds albuminous 154. Cistaceae. 



Sepals and petals 5, with imbricate, not contorted aestivation. Ovules 

 inverted or incurved. Trees or shrubs 148. Theaceae. 



433. (416.) Calyx with valvate, closed, or open aestivation 434 



Calyx with imbricate or contorted aestivation. Leaves undivided. 438 



434. Corolla with valvate, calyx with open aestivation. Ovary 3- — 8-celled. 



Seeds albuminous. Leaves alternate, undivided. Trees or shrubs. 



145. Scytopetalaceae. 



