Thrixanthocereus senilis F.Ritter in Kakteen And. Sukk. 12: 89. 1961 Thrixanthocereus senilis F.Ritter in Kakteen And. Sukk. 12: 89. 1961is basionym for Espostoa senilis (F.Ritter) N.P.Taylor in Cact. Succ. J. Gr. Brit. 40(2): 54. 1978Taxon for this nameThrixanthocereus senilis F.Ritter