George Engelmann : botanical notebook 9 : Echinocereus, Cereus, Eulychnia, Pilocereus - Engelmann, George, (1857)
https://www.biodiversitylibrary.org/bibliography/149828
Keywords: (Charles Christopher); |(Frédéric Albert Constantin); |(John Jefferson); |(William Hemsley); |1806-1894|1809-1884|1811-1887|1823-1890|1826-1892|1830-1903|1842-1899|1852-1937|Botanical illustration|Cactaceae|Cereus|Correspondence|Coues; Elliott; |Davis; J. J|Echinocactus|Emory; William H|Engelmann; George; |North America|Parry; C. C|Pilocereus|Plant collecting|Roetter; Paulus; |Watson; Sereno; |Weber; F. A. C|