Try to make your search as simple as possible:
Hicorius will find all items including that sequence of letters.
Search results for "Hicorius":
"Hicorius cathayensis" - Carya cathayensis
"Hicorius glabra var. villosa" - Carya texana
"Hicorius laciniosa" - Carya laciniosa
"Hicorius villosa" - Carya texana