Franz Josef Niedenzu (29 November 1857 – 30 September 1937) was a German botanist born in Köppernig. He is remembered for his work with the botanical family Malpighiaceae.
For most of his career he was a professor and subsequently rector at the Lyceum Hosianum in Braunsberg, East Prussia (presently Braniewo, Poland). At Braunsberg, he established a botanical garden.
He was author of the chapter on Malpighiaceae in Adolf Engler's " Das Pflanzenreich", and contributed descriptions of nine plant families in Engler and Prantl's " Die Natürlichen Pflanzenfamilien". He identified numerous new species, as well as six genera; Alcoceratothrix (now Byrsonima), Callyntranthele (now Blepharandra), Cordobia, [1] Diaspis (now Caucanthus), Malpighiodes, [2] and Sprucina (now Jubelina).
In 2006, botanist W.R.Anderson published Niedenzuella, a genus of flowering plants from South America, belonging to the family Malpighiaceae and named in his honour. [3]