Page authors: Don Knoke, David Giblin
Veronica filiformis
thread-stalk speedwell

Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, east to Montana, also in eastern North America.

Habitat: Weed of lawns and gardens

Flowers: April-June

Origin: Introduced from Eurasia

Growth Duration: Perennial

Conservation Status: Not of concern


Mat-forming perennial, the stems 1-4 dm. long, lax, simple or branched below, loosely ascending, often rooting at the lower nodes.


Principal leaves opposite, short-petiolate, the blade broadly elliptic to nearly orbicular, cordate based, with short, broad teeth, 1-2 cm. long and three-fourths or more as wide.


Flowers single on long pedicels (up to 6 cm. in fruit) along an elongate stem, each subtended by a leaf-like, alternate bract, which are reduced upward; sepals 4, prominent, often veiny; corolla bluish-lavender, 5-11 mm. wide, rotate, 4-lobed; the upper lobe the largest; style 1.5-2.5 mm. long; stamens 2.


Capsule 5-9 mm. wide and 3-5 mm. high.

Accepted Name:
Veronica filiformis Sm.
Publication: Trans. Linn. Soc. London 1: 195. 1791. 1791.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Veronica filiformis in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Veronica filiformis checklist entry.

E-Flora BC: Veronica filiformis atlas page.

CalPhotos: Veronica filiformis photos.

USDA Plants: Veronica filiformis information.

10 photographs:
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