A KEY 



TO THE 



NATURAL ORDERS OR FAMILIES 



OF PLANTS DESCRIBED IN THIS WORK. 



Series 1. Flowering- Plants. Plants with flowers, having slamens and 

 pistils, and producing seeds, which contain an embryo. 



Class I. Exogenous or Dicotyledonous Plants. Ste)ns distinctly 

 formed oHx/rk, wood and pith ; the loood 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 p^ge. 

 other. 



Herbs with perfect flowers and divided leaves. Ranunculace^, 26 

 Small trees with 6-petalled flowers and entire 

 leaves. Anonace^, 36 



Pistfls numerous, grown together one above 



another, covering the long receptacle. Magnoliace^, 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 BERBERiDACEiE, 36 



Petals 4 and irregular, or else very small. Ranunculace^, 26 

 (16) 



