This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Veronica peregrina L. Sp. Pl. 14. 1753.
Annual, glabrous, or glandular-puberulent; stem erect or ascending, simple or branched, 3'-12' high. Leaves oblong, oval, linear or slightly spatulate, 3"- 10" long, obtuse or acutish, the lowest opposite, short-petioled, or sessile, broader than the upper and usually denticulate, the upper alternate, sessile, mostly entire, each with a short-pedicelled flower in its axil; flowers nearly white, about 1" broad; pedicels much shorter than the calyx; capsule nearly orbicular, obcordate, usually a little shorter than the calyx, 1"- 1 1/2" high, many-seeded, the seeds flat.
In moist places, and common as a weed in cultivated soil, Nova Scotia to British Columbia, south to Florida, Mexico and California. Also in Central and South America, distributed as a weed in the Old World. May-Oct.
Veronica arvensis L. Sp. Pl. 13. 1753.
Annual, pubescent; stem slender, at first simple and erect, at length much branched and diffuse, 3'-10' long. Lower leaves ovate or oval, opposite, obtuse at both ends, crenate or crenulate, 2" - 6" long, the lowest petioled; upper leaves sessile, alternate, ovate or lanceolate, acute or acutish, commonly entire, each with a short pedi-celled minute flower in its axil; pedicels shorter than the calyx; corolla blue, or nearly white, 1" broad or less; capsule broadly obovate, obcordate, 1" high.
In fields, woods and waste places and in cultivated soil, Nova Scotia to Ontario and Minnesota, south to Florida, Kansas and Texas. Also in Bermuda. Naturalized from Europe. Native also of Asia. March-Sept.
Veronica agrestis L. Sp. Pl. 13. 1753.
Annual, pubescent; stems creeping or procumbent, very slender, branched, 3"- 8" long, the branches ascending or spreading. Leaves broadly ovate or oval, obtuse at the apex, rounded, truncate or subcordate at the base, crenate, all short-petioled, or the uppermost sessile, the lowest opposite, the upper alternate and each with a slender-peduncled small blue flower in its axil; peduncles equalling or longer than the leaves; corolla not exceeding the calyx; capsule broader than high, compressed, but not very flat, narrowly emarginate at the summit, 1" high, 2" broad; seeds few, hollowed out on the inner side.
In fields and waste places, Nova Scotia to New Jersey and Louisiana. Naturalized from Europe. Native also of Asia. Other English names are germander-chickweed and winter-weed. May-Sept.
Veronica Tournefortii Gmelin, Fl. Bad. 1: 39. 1805. Veronica agrestis var. byzantina Sibth. & Smith, Fl. Graec. 1: pl. 8. 1806. V. Buxbaumii Tenore, Fl. Nap. 1: 7. pl. 1. 1811. V. byzantina B.S.P. Prel. Cat. N. Y. 40. 1888.
Annual, pubescent; stems diffusely branched, spreading or ascending, 6'-15' long. Leaves ovate or oval, short-petioled, obtuse or acutish, sometimes narrowed at the base, crenate-dentate or somewhat incised, 4"-12" long, the lowest opposite, the upper all alternate and each with a slender-peduncled rather large blue flower in its axil; peduncles filiform, as long as the leaves or longer; corolla exceeding the calyx, 3" - 4" broad; capsule twice as broad as high, 3" broad, with a wide and shallow emargination at the summit; seeds few or several, hollowed out on the inner side.
In waste places, Nova Scotia to southern New York and Ohio; Colorado to California. Adventive or naturalized from Europe. Native also of Asia. Bird's-eye. Cat's-eye. May-Sept.