In the Mediterranean there are other areas with species adapted to the same habitat, but which generally do not form a laurel forest, except very locally in the southernmost tip of the Iberian Peninsula. The most important is ivy, a climber or vine that is well represented in most of Europe, where it spread again after the glaciations. The Portugal laurel (Prunus lusitanica) is the only tree that survives as a relict in some Iberian riversides, especially in the western part of the peninsula, particularly the Extremadura, and to a small extent in the northeast. In other cases, the presence of Mediterranean laurel (Laurus nobilis) provides an indication of the previous existence of laurel forest. This species survives natively in Morocco, Portugal, Italy, Greece, the Mediterranean islands, and some areas of Spain, including the Parque Natural Los Alcornocales in the province of Cádiz and in coastal mountains, especially in the Girona Province, and isolated in the Valencia area. The myrtle spread through North Africa. Tree Heath (Erica arborea) grows in southern Iberia, but without reaching the dimensions observed in the temperate evergreen forest or North Africa. The broad-leaved Rhododendron ponticum baeticum and/or Rhamnus frangula baetica still persist in humid microclimates, such as stream valleys, in Cádiz (Spain), in the Portuguese Serra de Monchique, and the Rif Mountains of Morocco.