LllMiAilY 



i 



rxi VKi;:?rrv of 

 CAI.IFOKXIA.^ 



€\mm of tljt ^t^dMt ilmjgkw. 



EXOGENS. — Plants witli distinct bark, wood, and pith ; the 

 wood increasing by yearly additions to its exterior ; leaves 

 reticulated ; flowers usually in quinary or quaternary ar- 

 rangement, and embryo dicolytedonous. 



ENDOGENS. — Stem increasing by internal growth, and having 

 no distinct pith or bark ; leaves parallel veined ; flowers 

 glumiferous, or arranged in ternary order ; embryo mono- 

 cotyledonous. 



ACEOGENS. — Cryptogamic plants, with distinct stem, con- 

 taining vascular tissue ; leaves with forked venation, or 



veinless. 



THALLOGENS.— Cellular cryptogamic plants. 



SUB-CLASSES OF EXOGENS. 



Thalamiflor^. — Flowers usually dichlamydeous ; stamens 

 hypogynous. 



Cai.yciflor^. — Flowers dichlamydeous ; petals distinct or 

 united ; stamens perigynous or epigynous. 



CoROLLiFLOR^. — Flowcrs dichlamydeous ; petals united ; 

 stamens rising from the receptacle or corolla. 



MoNOOHLAMYDE^. — Flowors with a calyx, or achlamydeous. 

 This sub-class has two sub-divisions — 



1. Angiosperm^. — Ovules contained in a pericarp. 



2. Gymnosperm^. — Ovules not contained in a true pericarp. 



