Robson, Norman Keith Bonner <br/><br/>
Studies in the genus hypericum l:   Infrageneric classification 

 - London:   The British Museum,   1977 
 - 355p. 
<br/><br/><label>ISSN: </label>0068-2292 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hypericum
<br/><br/><label>Subjects--Index Terms: </label>Classification 
<br/><br/><label>Universal Decimal Class. No.: </label>582.5.9(42)  / L7