Pachycereus schumannii (Mathsson ex K.Schum.) C.Nelson in Ceiba 42: 16. 2001 Pachycereus schumannii (Mathsson ex K.Schum.) C.Nelson in Ceiba 42: 16. 2001is new combination for Cereus schumannii Mathsson ex K.Schum. in Monatsschr. Kakteenk. 9: 131. 1899Taxon for this namePachycereus schumannii (Mathsson ex K.Schum.) C.Nelson