Plant systematics  theory and practice 
Gurucharan Singh. 
 - Calcutta  Oxford and IBH Publishing  1999 
 - x, 359p., ill.; 24cm. 
<br/><br/><label>ISBN: </label>81-204-1364-4. 
<br/><br/><label>Dewey Class. No.: </label>582.13  / G96P