Final answer:
New England salt marsh plants include halophytic plants like Purple Loosestrife, Yellow Iris, and Parrot Feather, which have adapted to salty conditions in estuaries.
Step-by-step explanation:
The salt marsh plants found in New England's estuaries include a variety of halophytic plants capable of tolerating salty conditions. These plants have developed various adaptations to deal with challenges such as saltwater on their roots or sea spray. Examples of these plants include Lythrum salicaria (Purple Loosestrife), Iris pseudacorus (Yellow Iris), and Myriophyllum aquaticum (Parrot Feather). Animals in these ecosystems, such as mussels and clams, also display remarkable adaptations to the dynamic salinity of their environment.