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Most undeveloped land is devoted to the cultivation of cereals (mostly wheat), and, to a lesser extent, to gardens in the fertile lowlands of the Manzanares river. Some areas have been reforested with stone pines ("Pinus pinea") and aleppo pines ("Pinus halepensis"). These areas include the Cerro de los Ángeles, the Prado Acedinos, part of the hills of the Marañosa, and part of the park in the Sector III neighborhood. Common trees in the parks and streets of the city are the horse chestnut ("Aesculus hippocastanum"), the acacia, the elm ("Ulmus minor"), and the stone pine. Other less common trees include cedars, cypress, aleppo pines, plum trees, poplars, fir trees, and palm trees.