Try to make your search as simple as possible:
Schotia will find all items including that sequence of letters.
Search results for "Schotia":
"Schotia kaffra" - Schotia afra
"Schotia simplicifolia" - Griffonia simplicifolia
"Schotia speciosa" - Schotia afra
"Schotia transvaalensis" - Schotia capitata