Try to make your search as simple as possible:
Unona will find all items including that sequence of letters.
Search results for "Unona":
"Unona carminativa" - Xylopia sericea
"Unona discolor" - Desmos chinensis
"Unona grandiflora" - Uvaria grandiflora
"Unona penduliflora" - Cymbopetalum penduliflorum