Try to make your search as simple as possible:
Torreya will find all items including that sequence of letters.
Search results for "Torreya":
"Cercidium torreyanum" - Parkinsonia florida
"Hymenoxys torreyana" - Tetraneuris torreyana
"Suaeda torreyana" - Suaeda nigra
"Torreya nucifera var.grandis" - Torreya grandis