xique xique cactus pilosocereus gounellei and sertao/caatinga landscape - oeiras, piaui

xique cactus pilosocereus gounellei sertaocaatinga landscape oeiras piaui northeast brazil sertao caatinga polygonus xiquexique view hinterland biome environment caryophyllales cactaceae brazilian cerrado backcountry typical endemic interior nature green plant background desert summer closeup dry natural white beautiful garden cacti serene travel semiarid sandy sunlight outdoor sky northeastern vegetation