Epiphyllum caudatum Britton & Rose in Contr. U.S. Natl. Herb. 16: 256. 1913
Epiphyllum caudatum in Contr. U.S. Natl. Herb. 16: 256. 1913
is basionym for Phyllocactus caudatus in Monatsschr. Kakteenk. 23: 116. 1913
Holotype: Mexico. Oaxaca: Near Comaltepec, 30 July 1894, Nelson 919 (US-00115643) http://n2t.net/ark:/65665/3f1d6808f-13fa-4126-9217-640b127a64df