Echinochloa crus-galli

About

Echinochloa crus-galli is a species of wild grass originating from tropical Asia that was formerly classified as a panicum grass. It is commonly known as cockspur, cockspur grass, barnyard grass, barnyard millet, water grass, cocksfoot grass, cockshin grass. It is sometimes referred to using the general term, barnyard grass, which may refer to any species of the genus Echinochloa. This plant can grow to 1.5 m (5 ft) in height and has long, flat leaves which are often purplish at the base. Most stems are upright, but some will spread out over the ground. Stems are flattened at the base. The seed heads are a distinctive feature, often purplish, with large millet-like seeds in crowded spikelets.

Summary from Wikipedia