246 



EXOGENS. 



Sub-Class IV. EPIGYNOUS EXOGENS. 



Flowers or $ 9 ; stamens growing to the side of either the calyx or 

 corolla ; ovary inferior or nearly so. 



Campanales. — Flowers dkhlamydeous, monopetalous ; embryo with little 



or no albumen. 

 Myrtales. — Flowers dichlamydeous, polypetalous ; placenta axile ; 



embryo with little or no albumen. {Occasionally mono- 

 chlamydeous.) 

 Cactales. — Flowers dichlamydeous, polypetalous ; placenta; parietal ; 



embryo with little or no albumen. 

 Grossales. — Flowers dichlamydeous, polypetalous ; seeds numerous, 



minute; embryo small, lying in a large quantity of 



albumen . 

 Cinchonales. — Floicers dichlamydeous, monopetalous ; embryo minute, 



lying in a large quantity of albumen. 

 Umbellales. — Floicers dichlamydeous, polypetalous ; seeds solitary , large ; 



embryo small, lying in a large quantity of albumen. 

 Asarales. — Flowers monochlamydeous ; embryo small, lying in a 



large quantity of albumen. 



The following artificial arrangement of the Alliances of Exogens will render it more easy to compare 



their characters. 

 Sub-class I.— DICLINOUS EXOGENS. 



Garryales. 



QlTERNALES. 



cucurbitalbs. 



Amentales. 

 Urticales. 



. Albumen abundant. 

 Ovary inferior . 

 Ovary superior. 

 Carpels several, disunited.MENispERMALES. 

 Carpels consolidated. 



Placentae axile . . Euphorbiales. 

 Placentae parietal . Papaya les. 

 Albumen wanting, or in moderate quantity. 

 Ovary inferior. 

 Placenta? axile 

 Placenta; parietal . 

 Ovary superior. 

 Flowers amentaceous . 

 Flowers not amentaceous 



Subclass II.— HYP0GYN0US EXOGENS. 

 t. Albumen abundant. 



Flowers achlamydeous . Piperalks. 

 Flowers monodichlamydeous. 



Embryo external . . Ny'mphales. 

 Embryo internal. 

 Stamens 00 . . . Ranales. 

 Stamens definite. 



Flowers unsymme- \ r> 



trical in the ovary / 

 Flowers symmetri- ) 

 cal in the ovary .J 

 i. Albumen wanting, or in small quantity. 

 Embryo external. 

 Carpels solitary, or dis- 1 c 



tinrt 



Jerberales. 



Ericales. 



IE NO POD ALES. 



Silenales. 



Carpels consolidated 

 Embryo internal. 

 Placentae axile or central. 

 Flowers unsymmetrical.SA pi n'dales 

 Flowers symmetrical. 

 Calyx valvate . 

 Calyx imbncated. 

 Mamens (10 . 

 Stamens definite. 

 Corolla twisted . 

 Corolla imbri- i 

 cated . . j 

 Placentae parietal or sutural. 

 Embrvo curved or > „ 



Spiral . . . }f STALES. 



Embryo straight . Viola les. 



Malvales. 



GtTTIFERALES. 



Geraniales. 



RutALKS. 



Sub-class III.— PERIGYNOUS EXOGENS. 



a. Albumen abundant. 



Placenta free, central . Cortusales. 



Placenta; axile or parietal . Ge.vtianai.es. 

 &. Albumen wanting, or in small quantity. 

 Embryo external . .Ficoidales. 



Embryo internal. 



Flowers unsvmmetrical. 

 Fruit capsular or bac- -. BlGN0NIALES . 



cate . . ■ ) 

 Fruit nucamentaceous. Echiales. 

 Flowers symmetrical. 

 M onochlamydeous . 

 Carpels solitary . Daphnales. 

 Carpels consolidated. Rhamnalrs. 

 Dichlamydeous. 

 Polypetalous. 

 Carpels consoli- ) 

 dated. Seeds > Rhamnales. 

 definite . .) 

 Carpels apocarpous.RosALES. 

 Carpels consoli- i ~ 

 dated. Seeds 00 } Saxifragai.ks. 

 Monopetalous. 



C cate Uar0r . baC ".} SoLANALES - 

 Nucamentaceous .Echiales. 

 Tricoccous . .Rhamnales. 



Sub-class IV.— EPIGYNOUS EXOGENS. 



a. Albumen abundant. 



Monochlamydeous . .Asarales. 



J> taVous^ 60118 : m0n ° Pe : } Cornales. 

 Dichlamydeous, polypetalous. 



Seeds solitary . . . Umbellales. 



Seeds 00. . . . Grossalks. 

 6. Albumen wanting, or in small quantity. 

 Placentae axile. 



Monopetalous. . .Campanales. 



Polypetalous . . Mvrtalrs. 



Placentae parietal .Cactales. 



