Certain trees are regarded as having spirits resident in them and are used as natural altars. Different species of tree are associated with different lwa; Oyu is for linked with mango trees, and Danballa with bougainvillea. Selected trees in Haiti have had metal items affixed to them, serving as shrines to Ogou, who is associated with both iron and the roads. Spaces for ritual also appear in the homes of many Vodouists. These may vary from complex altars to more simple variants including only images of saints alongside candles and a rosary.