Echiumcandicans im Germplasm Resources Information Network (GRIN), USDA, ARS, National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Abgerufen am 8. November 2015.
doi.org
José Augusto Carvalho, Tânia Pontes, Maria Isabel Batista-Marques, Roberto Jardim (2010): A new species of Echium (Boraginaceae) from the island of Porto Santo (Madeira Archipelago). In: Anales del Jardín Botánico de Madrid. Bd. 67(2), S. 87–96, doi:10.3989/ajbm.2239.
Federico García-Maroto, Aurora Mañas-Fernández, José A. Garrido-Cárdenas, Diego López Alonso, José L. Guil-Guerrero, Beatriz Guzmán, Pablo Vargas (2009): delta6-Desaturase sequence evidence for explosive Pliocene radiations within the adaptive radiation of Macaronesian Echium (Boraginaceae). In: Molecular Phylogenetics and Evolution. Bd. 52, S. 563–574, doi:10.1016/j.ympev.2009.04.009.