An extensive genus, most of the species being ornamental plants, the taller growing sorts suitable for the borders, and those of a more dwarfish habit for the rockery. The flowers are produced in spire-like spikes, or racemes, and are generally blue; but some few species are white, and others pink.
Veronica Virginica, is a tall, strong-growing species, four or five feet high, with white flowers in clustered spikes; in July and August; suitable for the shrubbery. V. Sibirica has blue flowers, in spikes, in July and August; two feet high. V. speciosa is a dwarf-species, with brilliant blue flowers, in spikes; June and July. V. azu-rea is two or three feet high, with fine sky-blue flowers. V. spicata is about one foot high, with fine blue flowers. There are as many as fifty species, all easily cultivated in almost any soil; propagated by dividing the roots.
A hardy evergreen prostrate plant, rooting at the joints; flowers blue with a white variety.
Great Periwinkle, with larger and rounder leaves than the foregoing and not quite so hardy, evergreen trailing plants; valuable for their early and long-continued flowering, flourishing under the shade, and drip of trees. It is best to give a little protection in winter. A variety of each, with gold-edged leaves, is very beautiful but not so hardy. There is also a variety with silver-edged leaves.
This is a beautiful green-house plant, with evergreen leaves; one variety with white flowers and red eye, another with white, and still another with rose-colored flowers. These varieties are in perpetual bloom, and are easily propagated by cuttings under a hand glass. Young plants planted out in June, will flower through the summer.