Grierson,C.J.A and Long,G.D. <br/><br/>
Flora of Bhutan:  including a record of plants from Sikkim. 

 - volume 1 part 1. 
 - Edinburgh:  Royal botanic garden,  1983. 
 - 186 p:  ill,  23.6 cm. 
<br/><br/><label>ISBN: </label>0950427012