Gibbs, P. e. <br/><br/>
Taxonomic studies on the genus Echium 1. An outline revision of the spanish species / P. E. Gibbs 

 - 56 páginas 
<br/><br/> il. byn., maps. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Echium<br/>Boraginaceae<br/>Flora<br/>España