Veronica arvensis (corn speedwell, common speedwell, speedwell, rock speedwell, wall speedwell ) is a medicinal plant  and noxious weed native to Africa, Asia and Europe. These weeds are common in gardens, pastures, and waste places. A member of the plantain family, it is a hairy, erect to almost recumbent, annual herb, 9 to 40 cm high from a taproot. The leaves are oppositely arranged in pairs about the stem. The lower leaves have short petioles; the upper are sessile. Each leaf, 1.5 to 2.5 centimeters in length, is ovate, or triangular with a truncated or slightly cordate base, with coarse teeth. Borne in a raceme, initially compact but elongating with age, the flowers are pale blue to blue-violet, 2 to 3 mm in diameter, four-lobed with a narrow lowest lobe. Flower stalks are 0.5 to 2 mm and shorter than the bracts. It flowers from April to October. Veronica Arvensis's are notably viable thriving weeds.
V. Arevensis plants go through changes in their Germination due to temperature and light, furthermore explaining what controls the timing of growth in buried seed reserves. These weeds tend to germinate in consistent temperature ranges of 10 degrees Celsius to 15 degrees Celsius. If they do not make the first autumn cycle of growth, they can grow in the following spring. Overall, light is a major source to their survival and growth. In other words, they can grow in darkness, however they will remain dormant unless they get light.
- Veronica arvensis at USDA PLANTS Database
- Veronica arvensis at Plants For A Future
- Veronica arvensis at Germplasm Resources Information Network - (GRIN)
- Stace, Clive (April 2010). New Flora of the British Isles (3). ISBN 9780521707725.
- Baskin, Jerry; Baskin, Carol (March 1983). "Germination Ecology of Veronica Arvensis". Journal of Ecology 71 (1): 57–68. doi:10.2307/2259963.
King, T.J (July 1975). "Inhibition of Seed Germination Under Leaf Canopies in Arenaria serpyllifolia, Veronica arvensis and Cerastum holosteoides". New Phytologist 75 (1): 87–90. doi:10.1111/j.1469-8137.1975.tb01374.x.
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