After the death of Martin Vahl in 1804, the task of publishing the Flora Danica was given to Hornemann, who subsequently issued fasc.
Hornemann was professor of botany at the University of Copenhagen from 1808 and director of the Botanic Garden (from 1817).
This fact prohibits the use of the names Hornemannia Vahl (1810) for the Caribbean genus of Ericaceae (now to be called Symphysia C.B.
[1] He is also commemorated in the specific epithets for the bird Carduelis hornemanni (Arctic Redpoll), the flowering plant Epilobium hornemannii Rchb.
Hans Christian Andersen was a frequent visitor in Hornemann's home in Copenhagen.