A KEY 



TO THE 



NATURAL ORDERS OR FAMILIES 



OF PLANTS DESCRIBED IN THIS WORK. 



SERIES 1. FLOWERING PLANTS. Plants with flowers, having stamens and 

 pistils, and producing seeds, which contain an embryo. 



CLASS I. EXOGENOUS or DICOTYLEDONOUS PLANTS. Stems distinctly 

 formed of bark, wood &ndpith ; the wood in stems lasting from year to year, 

 increasing by annual layers on the outside next the bark. Leaves netted- 

 veined. Embryo with two opposite cotyledons, or (in the Pine family) seve- 

 ral in a whorl. Parts of the flowers usually in fives or fours. 



SUB-CLASS 1. ANGIOSPERMS. Pistil a closed ovary, containing ovules 

 and becoming the fruit. Cotyledons 2. 



DIVISION I. POLYPETALOUS : Calyx and corolla both present (except in 

 some genera of Order I); the petals entirely separate (except in Order 

 XXX , where they are sometimes united). 



A. STAMENS NUMEROUS, MORE THAN 10. 

 1 . Stamens borne on the receptacle, entirely free from the calyx, corolla or ovary. 



Pistils more than one, entirely separate from each PAGE - 



other. 



Herbs with perfect flowers and divided leaves. RANUNCULACE^:, 26 

 Small trees with 6-petalled flowers and entire 



leaves. ANONACE^E, 36 



Pistils numerous, grown together one above 



another, covering the long receptacle. MAGNOLIACE^E, 34 



Pistils only 1, or 2 - several, more or less completely 

 united into one. 



Ovary simple and 1 -celled, with only one 

 placenta. 

 Petals large. Filaments shorter than the 



anthers. Podophyllum in BERBERIDACEUE, 36 



Petals 4 and irregular, or else very small. RAXUNCULACFLS:, 26 

 (16) 



