 The botanical genus "Hacquetia" is named after him, as well as the plant species "Pedicularis hacquetii" (Hacquet's lousewort).On one of his excursions, he discovered "on the evening, Trenta side of Triglav, a new species of scabious" and picked it for his herbarium collection, nowadays preserved in the Natural History Museum of Slovenia.He called the species "Scabiosa trenta" in the published description, and drew it.