Piptanthocereus peruvianus var. monstruosus (DC.) Riccob. in Boll. Reale Orto Bot. Palermo 8: 233. 1909
Piptanthocereus peruvianus var. monstruosus in Boll. Reale Orto Bot. Palermo 8: 233. 1909
is new combination for Cereus peruvianus var. monstrosus, Prodr. 3: 464. 1828