Root morphology observed in Carraluma tuberculata; A) IBA (1 mg/L) +NAA 0.5 mg/L, B and D) (1.5 mg/L) +NAA 0.5 mg/L, C) NAA (1 mg/L) +IBA 0.5 mg/L, E) NAA (2 mg/L)+IBA 0.5 mg/L.