Try to make your search as simple as possible:
Chorizema will find all items including that sequence of letters.
Search results for "Chorizema":
"Chorizema callistachys" - Callistachys lanceolata
"Chorizema cordatum (non-prick" - Chorizema cordatum non prickly form
"Chorizema cordatum x varium" - Chorizema cordatum non prickly form