Jan Thomas Johansson

• Motleyia, a new genus of the Rubiaceae from Borneo ; Pollen morphology of the tribe Morindeae (Rubiaceae) ; Revision of the genus Prismatomeris Thw. (Rubiaceae, Morindeae) ; Revision of the genus Coelospermum Blume (Rubiaceae, Morindeae)
• Pollen morphology in Psychotria (Rubiaceae, Rubioideae, Psychotrieae) and its taxonomic significance
• Revision of the genus Prismatomeris Thw. (Rubiaceae, Morindeae)
• Taxonomic and morphological studies in the tribe Morindeae (Rubiaceae)
• The genus Morinda (Morindeae, Rubioideae, Rubiaceae) in New Caledonia