Veronica persica, a
biennial herb introduced from Eurasia or Africa, has spread
throughout the country. Stems branch well and spread sideways, and
leaves are opposite on lower parts and alternate on upper parts,
0.7-1.8cm in length, 0.6-1.5cm in width, in the shape of an
oval-oblong, with 8-16 serrations on margins. Leaf axils on upper
portions bear 1-2cm-long peduncles on which single sky-blue flowers
come. Bloom time: March-May.