Botanical Exploration of Southern Africa : :An illustrated history of early botanical literature on the Cape Flora, Biographical accounts of the leading plant collectors and their activities in southern Africa form the days of the East India Company until the modern times - Glen, H.F. (SANBI, 2010)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 2003)

Contributions from the United States National Herbarium - United States. National Herbarium. (Smithsonian Institution Press, 2003)

Fieldiana Botany - Field Museum of Natural History. (Chicago Natural History Museum, 1980)

Fieldiana Botany - Field Museum of Natural History. (Chicago Natural History Museum, 1980)

Fieldiana Botany - Field Museum of Natural History. (Chicago Natural History Museum, 1980)

Fieldiana Botany - Field Museum of Natural History. (Chicago Natural History Museum, 1980)

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)

Index Kewensis. names of seed-bearing plants at the rank of family and below published between January 1981 and the end of 1985 with some omissions from earlier years Supplement eighteen - Royal Botanic Gardens, Kew. (Clarendon Press, 1987)

Manual de plantas de Costa Rica - Hammel, Barry Edward, 1946 - (Missouri Botanical Garden, 2003)