Template:Lems & Holzapfel, 1968

• Lems, K. & Holzapfel, C.M. 1968. Evolution in the Canary Islands. II. Revision of the Annual and Biennial Species of Echium (Boraginaceae). Bulletin of the Torrey Botanical Club 95(1): 37–57. DOI: 10.2307/2483806  
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