Try to make your search as simple as possible:
Cleome will find all items including that sequence of letters.
Search results for "Cleome":
"Cleome icosandiza" - Cleome viscosa
"Cleome pinnata" - Stanleya pinnata
"Cleome pungens mix" - Cleome spinosa Colour Fountain Mix
"Cleome pungens Cherry Q." - Cleome spinosa Queen Cherry