SCIENTIFIC TREATMENT OF THE ARBORETUM. 309 



^re of course omitted. For the sake of convenience 

 we have marked the alliances and orders, selected for 

 our present purpose, with running numbei-s, beginning 

 iu both cases from unity ; but to prevent confusion 

 we have quoted the numeration of "The Vegetable 

 Kingdom" throughout, giving the numbers of its 

 classes and alliances within parentheses, thus : for a 

 class (Y. K. lY.,) and for an alliance (Y. K. 16.) "We 

 beg the reader's attention to the following 



LIST OF ABBREVIATIONS. 



D. Deciduous ; denoting plants shedding their leaves in autumn. 



E. Evergreen. 



SE. Sub-Evergreen ; applied to plants retaining part of their foliage 



throifgh winter. 

 T. Tree. 

 S. Slirub. 

 CL Climber — a plant climbing or twining, and requiring or finding 



support. 

 Tr. Trailing — applied to plants creeping or lying on the ground, 

 h. Hardy ; sh. sub-hardy, i. e. hardy in some places but not in others. 

 Sp. Species ; v. botanical variety. 



SYNOPSIS 



OF THE NATURAL ORDERS AXD GENERA OF PLANTS WHICH MAY BE EMPLOTBD 

 IN FORMING AN ARBORETUM. 



Class ENDOGENS. (V. K. IV.) 



Alliance 1. LILIALES. (V. K. 16.) 



Ord. 1. LiLiACE.E. Lilijworts. (Lindl. 62 ; Loud. 80.) 



Yucca. Adam'a Needle. E. S. sh. 4-10 ft Sp. 10 ; v. 2. 

 Ruscus. Stitcher's Broom. E. S. 2-3 ft Sp. 4 ; v. 3. 

 Borya. D. S. 5-8 ft Sp. 3. 



Cl.^ss DICTYOGENS. (V. K. V.) 



Alliance 2. DICTYOGENS. (Lindl.) 



Ord. 2. Smilace.c. Sarsaparillas. LindL 69 ; Loud. 79.) 

 Smilax. E. D. CI. Sp. 16. 



