Eg, basil or rosemary (4)
I believe the answer is:
herb
I believe this is a double definition.
'eg basil' is the first definition.
(I know that basil is a type of herb)
'rosemary' is the second definition.
(thesaurus)
(Other definitions for herb that I've seen before include "Medicinal or culinary plant" , "like Basil" , "Basil, perhaps" , "Chives or coriander, say" , "Useful or edible plant" .)