sentences:  They prefer soils developed over limestone, especially those of an ochre or reddish color and rich in clay, "de carácter relicto (Terra rosa, Terra fusca);" on occasions, as in the region of Tamajón (Guadalajara), they also colonize siliceous terrain.They are adapted to an exceptionally harsh continental climate, where practically no other species of tree is a rival; except for the Holm oak, which occupies some of the old, deforested juniper groves, and the European black pine ("Pinus nigra") which can accompany it with a certain frequency.The common juniper ("Juniperus communis" subsp.