Under the right conditions, water parsley(Oenanthe sarmentosa) spreads prolifically. Here the plants are growing under or just on the surface of the water, but water parsley foliage grows up to about 18" above the water, too. The foliage is pretty and it grows heads of delicate white flowers.
Red Alder Trunks Reflect Among Water Parsley in a Coast Range Beaver Pond.
