There are actually dozens of types of this underwater plant, which is also called "pondweed".
These pictures are all of clasping leaf pondweed, which is named for the way the leaves wrap around the stems of the plants. These plants are found in both still and slowly flowing waters across North America.
Pondweed plants make great food for many ducks and other waterfowl, who eat the seeds, stems and roots.
Cool Fact:
The different types of pondweeds often have nicknames, such as "spotted", "curlyleaf", "flatleaf", "grassy", "water thread", "floating" or "white stem". Do you have a nickname that decribes you?