Simpson, Beryl Brintnall. <br/><br/>
A revision of the genus polylepis (Resaceae  Sanguisorbeae) / 
Beryl B. Simpson. 
 - Washington :  Smithsonian Institution Press,  1979. 
 - iii, 62 p. :  ll. ;  26 cm. 
 - Smithsonians contributions to Botany ;  no.43 .
<br/><br/>Bibliography : p.60-61. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Polylepis.<br/>Botany--Andes.