during Franco's dictatorial regime, swore the Basque charters in the Oak of Guernica. An oak tree is depicted on the heraldic arms of Biscay and subsequently on the arms of many of the towns of Biscay. An oak leaf logo is used by the local government of Biscay. The logo of the Basque nationalist party Eusko Alkartasuna has one half red and the other green, the colors of the Basque flag. An old version of the logo of the Basque nationalist youth organisation Jarrai also display oak leaves. The Basque authorities present descendants of the tree as a symbol of friendship to Basque diaspora groups and related cities. Other fuero trees in Biscay Malato in Luiando, another tree of special significance for the Basques. The Abellaneda oak for the Encartaciones Juntas. The Gerediaga oak for the Durango area. The Aretxabalagana oak, where Biscaynes had to receive their lord when he came to put his oath on the fuero under the Gernika oak. See also , the meeting place of the Frisians and symbol of the Frisian freedom. List of individual trees References External links Arbol de Gernika in the Spanish-language Auñamendi Encyclopedia. Tourism in the Basque Country Page on the tree at the site of the General Assemblies of Biscay (English, Basque, Spanish and French). L'arbre de Guernica , a 1975 Surrealist film by Fernando Arrabal. Individual oak trees Basque history Guernica Individual trees in Spain Trees in culture