Kuhlmann was a specialist on taxonomyofangiosperms. He was a great collector of herborized material (his collection was gathered at a museum - Botanical Museum Kuhlmann, created in 1960, later the Botanical Museum of the Botanical Garden of Rio de Janeiro opened to the public on September 20, 1991, incorporated this collection of the Kuhlmann Museum [1]) and notable connoisseur of the Brazilian Flora, influencing a large number of researchers in this area of the knowledge in Brazil, for example William Rodrigues. He published about eighty works, describing new genera (see below), and species. He also erected two families. He put Peridiscus in a family by itself in 1950. Peridiscaceae has since been expanded to include Medusandra,Soyauxia, and Whittonia. He also put Duckeodendron into its own family, Duckeodendraceae, but this, and other segregatesofSolanaceae are no longer recognized as separate families by APG.
In 1944 he became the director of the Rio de Janeiro Botanical Garden, exerting this function up to 1951.[1]
(in Portuguese) Kuhlmann, J. G. & A. J. Sampaio (1928): Clinostemon, novo Gênero de Lauráceas da Amazônia. Boletim do Museu Nacional do Rio de Janeiro 4 (2):57-59. (Clinostemon, new genusofLauraceae from Amazonia).
(in Portuguese) Kuhlmann, J. G. Arquivos do Serviço Florestal 3: 4. 1950 (paper which he described the new family Peridiscaceae).
List of plant genera authored by João Geraldo Kuhlmann
