Veronica longifolia, known as garden speedwell or longleaf speedwell, is a flowering plant in the family Plantaginaceae where many introduced varieties in North America are native to Europe and Western Asia.
Description
This herbaceous perennial is tall and spreads to . The flower spikes are long and bear lilac to purple blooms. The foliage is lance-shaped with dark green leaves that are arranged oppositely along the stem.
Further reading An exploration of botanical issues in delimiting this species can be found at Notes on the taxonomy of Pseudolysimachion longifolium complex (Scrophulariaceae), 2000 (26 pages), by Bohumil Travnicek
References