Drug and condiment plants /

by Williams, Louis Otho 1908-1991, Williams, Louis Otho 1908-1991
Published 1960

Homage to Standley : papers in honor of Paul C. Standley /

by Williams, Louis Otho 1908-1991
Published 1963

The Orchidaceae of Mexico /

by Williams, Louis Otho 1908-1991
Published 1965

Orchids of Panama /

by Williams, Louis Otho 1908-1991
Published 1980

Orchidaceae Austro-Americanae /

by Williams, Louis Otho 1908-1991
Published 1939

Las Orquidaceas del noroeste argentino /

by Williams, Louis Otho 1908-1991
Published 1939

Flora of Guatemala /

by Standley, Paul Carpenter 1884-1963
Published 1969

Contributions toward the orchid flora of Panamá /

by Schweinfurth, Charles 1890-1970
Published 1937