1. Source and distribution: Italian celery may have originated in the Mediterranean region, while parsley originated in Europe, so the distribution and source are different.

2. Leaf shape: celery leaves are yellow-green, wide, deep and rectangular. Parsley, on the other hand, has dark green leaves, which are narrow and clear, like gears, and are pointed and oval.

3. Taste and use: Italian celery has a strong taste and is often used for soup, cooking and cooking. In contrast, parsley is mild in taste and is usually used to make salads, western-style soups or as decoration.

Generally speaking, celery and parsley are different in source, distribution, leaf shape, taste and use. But no matter what kind of celery it is, it adds unique taste and nutritional value to people's cooking and food world.