Paspalum dilatatum, commonly known as dallisgrass, is a perennial bunch grass native to the grasslands and open woodlands of Brazil and Argentina. It typically grows decumbent or erect to over 3 feet tall, forming dense clumps. The leaves are mostly hairless, and during the summer months, it produces an inflorescence with branches lined with green to purple spikelets. The flowers are not particularly showy, but they are notable for their purplish hue when young.

Dallisgrass is valued for its use as forage due to its high productivity and palatability to livestock. It thrives in full sun and can tolerate a range of soil types, although it prefers moist, fertile soils. It is often found in pastures, along roadsides, and in disturbed areas. However, its aggressive growth and ability to form dense stands make it a problematic invasive species outside its native range, particularly in the southern United States, southern Europe, Africa, Australia, and New Zealand. In cultivation, it requires minimal maintenance once established but can be difficult to eradicate due to its persistent nature and tendency to reseed.CC BY-SA 4.0