Veronica arvensis, an
alien species from Eurasia or Africa, is a biennial herb spreading
across the country, with stems erecting 10-30cm in height. Leaves
are opposite, 0.6-2cm in length, 0.4-1.8cm in width, in the shape of
a broad oval, with relatively significant serrations on margins;
blades on upper parts becoming smaller as to go upward and grow into
bracts. Single small purple flowers emerge from lea axils on upper
portions. Bloom time: April-June.