Botanischer Jahresbericht - Just, Johann Leopold, 1841 -1891 (Gebr. Borntraeger, 1874)

The Cactaceae : descriptions and illustrations of plants of the cactus family - Britton, Nathaniel Lord, 1859 -1934 (Carnegie Institution of Washington, 1923)

Carnegie Institution of Washington publication - Carnegie Institution of Washington (Carnegie Institution of Washington, 1923)

Comparative anatomy of the vegetative organs of the phanerogams and ferns - Bary, A. de (Anton), 1831 -1888 (Clarendon Press, 1884)

Comparative anatomy of the vegetative organs of the phanerogams and ferns - Bary, A. de (Anton), 1831 -1888 (Clarendon Press, 1884)

Comparative anatomy of the vegetative organs of the phanerogams and ferns - Bary, A. de (Anton), 1831 -1888 (Clarendon Press, 1884)

Comparative anatomy of the vegetative organs of the phanerogams and ferns - Bary, A. de (Anton), 1831 -1888 (Clarendon Press, 1884)

Comparative anatomy of the vegetative organs of the phanerogams and ferns - Bary, A. de (Anton), 1831 -1888 (Clarendon Press, 1884)

Comparative anatomy of the vegetative organs of the phanerogams and ferns - Bary, A. de (Anton), 1831 -1888 (Clarendon Press, 1884)

Monatsschrift für Kakteenkunde (J. Neumann, 1897)

Monatsschrift für Kakteenkunde (J. Neumann, 1921)

Vergleichende Anatomie der Vegetationsorgane der Phanerogamen und Farne - Bary, A. de (Anton), 1831 -1888 (Wilhelm Engelmann, 1877)