One of the riddles he tried to solve was a mysterious plant species Scabiosa trenta, described by Belsazar Hacquet and later proven by Anton Kerner von Marilaun to be a specimen of the already known Cephalaria leucantha.
Un dos enigmas que tentou resolver era unha especie planta misteriosa Scabiosa trenta, descrito por Belsazar Hacquet e posteriormente comprobada por Anton Kerner von Marilaun para ser un exemplar do Cephalaria xa coñecido leucantha.