A KEY 



TO THE 



NATURAL ORDERS OR FAMILIES 



OF PLAINTS DESCRIBED m THIS WOEK. 



Series ].. Flowering Plants. Plants with flowers, having Partem sud 

 pistils, and producing seeds, which contain an embryo. 



Class I. Exogenous or Dicotyledonous Plants Stems distinctly- 

 formed of &ar/c, ?worf and j9i^7t ; the wood in stems lasting from year to year, 

 increasing by annual laijers on the ontside 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 ovulea 

 and becoming the fruit. Cotyledons 2. 



Division I. Poltpetalous : 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 home on the receptacle, entirely free from the calyx, corolla or ovary. 



Pistils more than one, entirely separate from each p^gb 

 other. 



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

 Small trees with 6-petalled flowers and entire 

 leaves. Anonace^, 36 



Pistils 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. PodophyUum in Berberidacej3, 36 



Petals 4 and irregular, or else very small. Ranuncul \.ce.^, 26 

 (16) 



