The refuge grasslands are a habitat model for maritime grasslands, a disappearing habitat type on Long Island due to development. Maritime grasslands are native grasslands composed of little bluestem (Schizachyrium scoparium), switchgrass (Panicum virgatum), poverty grass (Danthonia spicata), hairgrass (Deschampsia flexuosa), and prickly pear cactus (Opuntia humifusa).