Dichanthelium portoricense, commonly known as Hemlock Witchgrass, is a species of grass native to the Caribbean region. This perennial grass is characterized by its erect to spreading growth habit, typically reaching heights of 30 to 80 centimeters. The culms, or stems, are slender and can be smooth or slightly hairy. Its leaves are linear to lanceolate, measuring about 10 to 30 centimeters in length and 5 to 10 millimeters in width, with a rough texture and a prominent midrib. The leaf sheaths are usually smooth and shorter than the internodes. The inflorescence of Dichanthelium portoricense is a panicle, which can be open or somewhat contracted, usually appearing at the apex of the culm and sometimes from upper axils. The panicles are typically 5 to 15 centimeters long, bearing numerous small spikelets. Each spikelet is ovate to elliptical, measuring approximately 2 to 3 millimeters in length, and is typically greenish or purplish. The glumes are unequal, with the first glume being shorter than the second. The fruit is a caryopsis, a small, hard grain typical of grasses. Dichanthelium portoricense is found in its native range across Puerto Rico and the Virgin Islands. It thrives in a variety of habitats, often found in open woodlands, savannas, disturbed areas, and along roadsides. It prefers well-drained soils and can tolerate a range of light conditions, from full sun to partial shade. While not widely cultivated, its ecological role in its native environment is significant, contributing to the biodiversity of grassland and open woodland ecosystems. This species plays a role in the local flora by providing habitat and forage for small animals and insects. Its ability to colonize disturbed areas suggests a degree of resilience and adaptability within its natural range. As with many native grasses, Dichanthelium portoricense contributes to soil stabilization and nutrient cycling in its ecosystem. Further research into specific economic, medicinal, or culinary uses for this particular species is limited, with its primary significance lying in its contribution to the native plant communities of the Caribbean. Its adaptations, such as its perennial nature and ability to reproduce via seeds, allow it to persist in its environment.