Veronica agrestis, commonly known as green field-speedwell, is a flowering plant belonging to the family Plantaginaceae.
Harris, G. R.; Lovell, P. H. (December 1980). 'Localized Spread of Veronica filiformis, Veronica agrestis, and Veronica persica'. Journal of Applied Ecology. 17 (3): 815–826. doi:10.2307/2402658. JSTOR 2402658.