The park is home to hundreds of plant species including several endangered species. The most interesting plants are perhaps the mangroves. The park protects one of the longest continuous stretches of mangroves left on Florida's East coast. Semaphore prickly-pear cactus were discovered in the park. They grow only in South Florida. The endangered Sargent’s Palm also exists in the park. It is considered to be the rarest palm native to Florida.