A dictionary of plant names - Hollandsche Maatschappij der Wetenschappen (M. Nijhoff, 1911)

Dictionary of the common names of plants with list of foreign plants cultivated in the open - Marloth, R. (Rudolf), 1855 -1931 (Specialty Press of South Africa, 1917)

A dictionary of the flowering plants and ferns - Willis, J. C. (John Christopher), 1868 -1958 (The University Press, 1919)

Diez anos de adiciones a la flora del Peru: 1993-2003 - Brako, Lois, 1950 - (Universidad Privada Antenor Orrego, 2004)

The different forms of flowers on plants of the same species /by Charles Darwin - Darwin, Charles, 1809 -1882 (D. Appleton, 1900)

The different forms of flowers on plants of the same species - Darwin, Charles, 1809 -1882 (J. Murray, 1877)

The different forms of flowers on plants of the same species - Darwin, Charles, 1809 -1882 (J. Murray, 1880)

The different forms of flowers on plants of the same species - Darwin, Charles, 1809 -1882 (John Murray, 1892)

The different forms of flowers on plants of the same species - Darwin, Charles, 1809 -1882 (D. Appleton and company, 1897)