LATMOSS, a catalogue of neotropical mosses - Cárdenas S., Ángeles, 1949 - (Missouri Botanical Garden, 1995)

New species of Xanthium and Solidago - Millspaugh, Charles Frederick, 1854 -1923 (1918)

Publication. Field Museum of Natural History Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1927)

Publication. Field Museum of Natural History Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1927)

Publication. Field Museum of Natural History Botanical series - Field Museum of Natural History. (Field Museum of Natural History, 1927)

Revision of the North American species of Xanthium - Millspaugh, Charles Frederick, 1854 -1923 (1919)