Annales botanices systematicae - Walpers, Wilhelm Gerhard, 1816 -1853 (Sumtibus F. Hofmeister, 1848)

Botanical publications of E.D. Merrill - Merrill, Elmer D. (Elmer Drew), 1876 -1956 (1899)

An enumeration of Philippine flowering plants - Merrill, Elmer D. (Elmer Drew), 1876 -1956 (Bureau of Printing, 1922)

Index Kewensis Supplement twenty one Names of seed-bearing plants at the rank of family and below published between January 1996 and the end of 2000 with some omissions from earlier years - Royal Botanic Gardens, Kew. (Royal Botanic Gardens, Kew)

Lasianthera: The scientific journal for the Orchidaceae of Papua New Guinea - National Capital Botanical Gardens (Boroko, Papua New Guinea) (National Capital Botanical Gardens, 1997)

Lasianthera: The scientific journal for the Orchidaceae of Papua New Guinea - National Capital Botanical Gardens (Boroko, Papua New Guinea) (National Capital Botanical Gardens, 1997)

Orchidaceae: illustrations and studies of the family Orchidaceae - Ames, Oakes, 1874 -1950 (Houghton, Mifflin, 1915)

Orchidaceae: illustrations and studies of the family Orchidaceae - Ames, Oakes, 1874 -1950 (Houghton, Mifflin, 1915)

Orchidaceae: illustrations and studies of the family Orchidaceae - Ames, Oakes, 1874 -1950 (Houghton, Mifflin, 1915)

Das Pflanzenreich :regni vegetablilis conspectus - Engler, Adolf, 1844 -1930 (W. Engelmann, 1900)

Das Pflanzenreich :regni vegetablilis conspectus - Engler, Adolf, 1844 -1930 (W. Engelmann, 1900)

The Philippine journal of science - Philippines. National Science Development Board. (Bureau of Science, 1913)