Veronica arvensis is an annual herb, hairy, 5-30 cm tall, stem slender, erect or ascending, larger plants branched near base.
Leaves opposite below, egg-shaped, to 1.5 cm long, tip bluntly pointed, veins palmate, impressed above, hairy on both sides, margin blunt-toothed, short-stalked, upper leaves stalkless (sessile), semi-evergreen, progressively smaller and narrower becoming alternate in inflorescence; bract-like, often untoothed.
Flowers blue, about 0.2 cm wide, irregular, tubular, 4-lobed, calyx hairy, lobes to 0.5 cm long, persistent; Inflorescence elongate, to two thirds length of plant, each flower in axil of a small leaf; blooms April-July mostly May (Hough 1983).
Fruit capsule heart-shaped, flattened, to 0.4 cm wide, margins hairy (ciliate), sides mostly hairless fruits Aug.-Sept (Hough 1983).
Wetland status: NL.
Frequency in NYC: Infrequent.
Habitat: Lawn weed, open roadsides, weedy edges, open woodlands.