Chinese Hemlock Parsley

Description:

The leaves are very much like parsley or carrots with large umbrels of white flowers

Habitat:

On the riverbank in a muddy area that often is submerged when the tide comes in.

Notes:

The flowers are similar to Cow Parsnip (Heracleum maximum), so the two are sometimes mistaken, but the leaves are dramatically different. If you look at the last photo, the large leaves on the left belong to Cow Parsnip.