Strophocactus wittii Holotype: Amazonas: near Manaus, 1900, Witt s.n. (B: B810006832) Isotype: Amazonas: near Manaus, 1900, Witt s.n. (US: US535998) Isotype: Amazonas: near Manaus, 1900, Witt s.n. (K: K000250213) DNA Bank DB 39898 Brazil, region of the Rio Negro., Schmidt, L. s.n. (Herbarium Berolinense: B GT 0023509)