Which of the following is a type of cacti known to grow in Brazil: Piper or Discocactus?
Piper (plant): Piper, the pepper plants or pepper vines (a term used for certain "Clematis" in older times), are an economically and ecologically important genus in the family Piperaceae. Discocactus: Discocactus is a genus of tropical cacti. Discocactus:  The name comes from the ancient Greek "diskos " (=disc) because of its shape.
Discocactus