Veronica peregrina is a species of flowering plant in the plantain family known by several common names including neckweed, American speedwell, purslane speedwell and hairy purslane speedwell. It is native to the Americas, and is known on other continents as an introduced species and a common weed. It can be weedy in its native range as well, growing on roadsides, on fields, and in other disturbed habitat. It is an annual herb growing from a taproot. The two subspecies are defined generally on the basis of hairiness: ssp. xalapensis is coated in glandular hairs and ssp. peregrina is a hairless variety. The plant produces erect stems up to about tall. The leaves vary in shape from linear to lance-shaped to spoon-shaped with smooth or serrated edges; the lower leaves are borne on petioles. The inflorescence is a loose terminal raceme of flowers and lance-shaped bracts. The flowers are generally white and wide.

Taxonomy: Veronica peregrina was given its scientific name in 1753 by Carl Linnaeus. It part of the genus Veronica, which is classified in the Plantaginaceae family. It has no accepted subspecies but has two among its synonyms.

Table of Synonyms	Name	Year	Rank	Notes
Lam.}}	1791	species	= het.
Walter}}	1788	species	= het.
Kunth}}	1818	species	= het.
Lam.}}	1779	species	= het.
Murray}}	1782	species	= het., nom. illeg., homonym. post.
Vorosch.}}	1968	species	= het.
Gaterau}}	1789	species	= het.
Elenevsky}}	1975	subspecies	= het.
Vict. & J.Rousseau}}	1940	variety	= het.
Honda}}	1940	variety	= het.
(L.) Dumort.}}	1827	variety	= het.
Rchb.}}	1823	variety	= het.
Pennell}}	1935	subspecies	≡ hom., not validly publ.
(Kunth) Pennell}}	1935	subspecies	= het.
(Kunth) H.St.John}}	1928	variety	= het.
(Kunth) Kitag.}}	1979	form	= het.
(Kunth) Pennell}}	1919		= het.
Willd. ex A.Dietr.}}	1831	species	= het.
L.}}	1753	species	= het.
Peck}}	1928	species	= het.
Kunth}}	1818	species	= het.
Notes: ≡ homotypic synonym; = heterotypic synonym