cactus in serra da capivara, piaui, brasil

alagoas background bahia biodiversity brasil brazilian caatinga cactus capivara ceara closeup desert desertification drought dryland effects endemic facheiroa flora flower forest garden green letters lights macro melocactus melon natural nature neon nonato northeast outdoor piaui plant raimundo resistance rough sao semiarid serra shrubland some squamosa subtropical sunlight taxonomy thorn tough towards tropical vegetation water white xeric