ABRIDGED 



ARBORETUM ET FRUTICETUM 

 BRITANNICUM. 



Trees and shrubs, in common with all other flowering plants, are arranged 

 by botanists in two grand divisions ; viz. the Exogenous, or Dicotyledonous, 

 Plants, the stems of which increase from without, and the leaves of which 

 have reticulated veins ; and the Endogenous, or Monocotyledonoiis, Plants, 

 the stems of which increase from within, and the leaves of which have parallel 

 veins. The first class includes all the hardy trees and shrubs in Britain, with 

 the exception of shrubs of the genera Viicca, SmWax, 72uscus, and one or two 

 others, which belong to the second class. We shall arrange the genera and 

 species under the same subdivisions, subclasses, sections, orders, and tribes, 

 as we have adopted from DeCandoUe in our Hortus Britannicus. 



Class I. EXO'GEN^. 



Stems ina-easmgfrovi without ; Leaves ivitJi reticulated Veins. 



Subdivision I. DICHLAMY'DE^. 



Calyx and Corolla distinct, by wliick they are distinguished from Subdivision II., 

 in which the flowers have only a calyx. 



It is in consequence of this high developement of the floral envelopes, that 

 the greater part of handsome-flowering trees and shrubs are found in Dichla- 

 mydese, it rarely happening that those with a single floral envelope have any 

 brilliant colouring. 



Subclass 1. THALAMIFLO^RiE. 



Flowers with Petals and Stamens inserted in the Receptacle 



This subclass contains all the Polyandrous plants of Linnaeus ; as the sub- 

 class Calyciflorae, in which the stamens are seated on the calyx, contains all 

 the plants of the Linnaan class Icosandria. 



Section I. 



Carpella, that is, the component Parts of compound Capsules or Fruits, numerous; 

 or the Stamens placed opposite the Petals. 



Order I. i2ANUNCULA^CE^. 



The Diagnostic, or Distinctive, Character, or, as we shall term it, the Ordinal 

 Character, of this order, is thus given by Dr. Lindley : *' Polypetalous, 



