[1]
J. A. Carvalho, T. Pontes, M. I. Batista-Marques, and R. Jardim, “A new species of Echium (Boraginaceae) from the island of Porto Santo (Madeira Archipelago)”, An. Jard. Bot. Madr., vol. 67, no. 2, pp. 87–96, Dec. 2010.