?6-Desaturase sequence evidence for explosive Pliocene radiations within the adaptive radiation of Macaronesian Echium (Boraginaceae) - García-Maroto, F.; Mañas-Fernández, A.; Garrido-Cárdenas, J.A.; Alonso, D.L.; Guil-Guerrero, J.L.; Guzmán, B.; Vargas, P. (Molecular Phylogenetics and Evolution, 2009)