[1] His most important work was Flora Pedemontana, sive enumeratio methodica stirpium indigenarum Pedemontii[citation needed] 1755, a study of the plant world in Piedmont, in which he listed 2813 species of plants, of which 237 were previously unknown.
[citation needed] In 1766, he published the Manipulus Insectorum Tauriniensium.
The journal Allionia: bollettino dell' istituto ed orto botanico dell' università di Torino is named after him.
[3] First Pehr Löfling and then Linnaeus named the New World herb genus Allionia (Nyctaginaceae) after Allioni.
[3][4] Per Axel Rydberg named the genus Allioniella (now a taxonomic synonym for Mirabilis), after him.