Dichanthelium longiligulatum, commonly known as Coastal Plain Witchgrass, is a perennial grass native to the southeastern United States. This species is a member of the Dichanthelium genus, which is characterized by its unique inflorescence that can present as both open and contracted, often changing throughout the season. Coastal Plain Witchgrass plays a role in the ecological communities where it is found, contributing to the biodiversity of its native habitats. Physically, Dichanthelium longiligulatum is an erect to spreading grass that typically reaches heights between 30 to 90 centimeters. Its growth habit is clump-forming, with slender culms that can sometimes lean or sprawl. The leaves are basal and cauline, generally flat and lanceolate to linear in shape, measuring from 15 to 40 centimeters long and 5 to 15 millimeters wide. A distinctive feature of this species, and a key diagnostic characteristic within the genus, is the presence of a prominent ligule. In Dichanthelium longiligulatum, this ligule is notably long, often exceeding 5 millimeters, and can be fringed with hairs, contributing to its specific epithet "longiligulatum." The inflorescence is typically a panicle, which can be open and spreading during the primary flowering period, later becoming more contracted and spike-like as the plant matures and produces seeds. The spikelets are ovate to elliptical and are typically pale green to purplish. The caryopses, or grains, are small and ovate. The native distribution of Dichanthelium longiligulatum is primarily concentrated along the Atlantic Coastal Plain of the southeastern United States, extending from North Carolina southward into Florida and westward into parts of Alabama. It thrives in sandy, well-drained soils characteristic of its namesake region. Its natural habitats include open pine forests, pine savannas, sandy fields, roadsides, and disturbed areas where sunlight is abundant. While not widely cultivated, its adaptability to sandy soils and drought tolerance suggest potential for use in ecological restoration projects or in naturalistic landscaping in appropriate climates. It prefers full sun to partial shade and is well-suited to xeric conditions once established. Ecologically, Dichanthelium longiligulatum serves as a food source for various wildlife, particularly for the seeds consumed by birds. Its presence contributes to the structural complexity of grassland and open woodland ecosystems. While there are no widely documented ornamental, agricultural, medicinal, culinary, or economic uses for this specific species, its ecological role in its native environment is significant. An interesting characteristic of Dichanthelium species, including Dichanthelium longiligulatum, is their ability to produce cleistogamous flowers. These are self-pollinating flowers that remain closed, ensuring seed production even when cross-pollination is not possible. This adaptation enhances reproductive success in variable environmental conditions. The long ligule, a defining feature, is thought to play a role in preventing water from entering the leaf sheath, a beneficial adaptation in humid environments.