Encyclopedia of Perennials 

 - London :  Royal horticultural Society ,     2006. 
 - 496p.   : col. ill.  
<br/><br/> Index to common names 488-492p. 
<br/><br/><label>ISBN: </label>9781409364689  
<br/><br/><label>Source: </label> Reference Collections 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Garden perennials<br/>Perennials