Petroselinum Crispum - Commonly referred to as Italian Parsley. Origin: native to the central Mediterranean region (southern Italy, Algeria and Tunisia). Appearance: Italian parsley is a plain flat leafed parsley. It has darker green leaves than curly leafed parsley. Taste: The flavor of Italian parsley is a bit stronger and better than curly parsley, as well as less bitter flavor. The reason being that there are more essential oils that make up the parsley taste.