Smithsonian contributions to botany - Smithsonian Institution (Smithsonian Institution Press, 1989)

Smithsonian contributions to botany - Smithsonian Institution (Smithsonian Institution Press, 1990)

Smithsonian contributions to botany - Smithsonian Institution (Smithsonian Institution Press, 1993)

Smithsonian contributions to botany - Smithsonian Institution (Smithsonian Institution Press, 1998)

Smithsonian contributions to botany - Smithsonian Institution (Smithsonian Institution Press, 2011)

Smithsonian contributions to botany - Smithsonian Institution (Smithsonian Institution Press, 2012)

Smithsonian contributions to botany - Smithsonian Institution (Smithsonian Institution Press, 2014)