Polygonum arenastrum, commonly known as equal-leaved knotgrass, is a summer annual flowering plant in the knotweed family Polygonaceae. Other common names include common knotweed, prostrate knotweed, mat grass, oval-leaf knotweed, stone grass, wiregrass, and door weed, as well as many others. It is native to Europe and can be found on other continents as an introduced species and a common noxious weed. Knotweed was first seen in North America in 1809 and is now seen across much of the United States and Canada.
Veronica officinalis, the heath speedwell, common gypsyweed, common speedwell, or Paul's betony, is a species of flowering plant in the plantain family Plantaginaceae. It is native to Europe and western Asia. It has been introduced to North America and is widely naturalised there.
Veronica arvensis, common names: wall speedwell, corn speedwell, common speedwell, rock speedwell, field speedwell, is an annual flowering plant in the plantain family Plantaginaceae. The species is a native European plant and a common weed in gardens, pastures, waste places and cultivated land.
Veronica hederifolia, the ivy-leaved speedwell, is a flowering plant belonging to the family Plantaginaceae. It is native to Europe, western Asia and north Africa and it is present in other places as an introduced species and a common weed. Solitary blue flowers occur in leaf axils, each with a corolla up to one centimetre (0.4 in) wide. The fruit is a dehiscent capsule.
Circaea lutetiana, known as broad-leaved enchanter's nightshade, is a plant in the evening primrose family, Onagraceae.
Veronica serpyllifolia, the thyme-leaved speedwell or thymeleaf speedwell, is a perennial flowering plant in the plantain family. It is native to Europe, but can be found elsewhere on most continents as an introduced species.
Lathyrus palustris is a species of wild pea known by the common name marsh pea. It is native to Europe, Asia, and North America. It is a perennial herb with leaves made up of oval-shaped or oblong leaflets a few centimeters long. It has branched, coiled tendrils. The plant bears an inflorescence of two to eight pinkish purple pea flowers each up to two centimeters wide. The fruit is a dehiscent legume pod.
Impatiens balfourii is a species of the genus Impatiens known by the common names Balfour's touch-me-not, Kashmir balsam, and poor man's orchid. It belongs to the family Balsaminaceae.
Lathyrus sphaericus is a species of wild pea known by the common names grass pea and round-seeded vetchling. It is native to Eurasia and much of Africa, and it is known on other continents as an introduced species. It can grow in many types of habitat, including disturbed areas. This is an annual herb producing a slender stem and bearing leaves each made up of two long, narrow, grasslike leaflets up to 6 centimeters long and a coiling, climbing tendril. The inflorescence is made up of one pea flower on a stalk one or two centimeters long ending a in a bristle. The flower is roughly a centimeter long and deep orange-red or dull red in color. The fruit is a hairless legume pod marked with longitudinal stripes.
Veronica derwentiana, commonly known as Derwent speedwell, is a flowering plant species of the family Plantaginaceae, endemic to south-eastern Australia. It is a perennial with toothed leaves and white or pale blue flowers in terminal sprays in spring and summer.
Fallopia baldschuanica is an Asian species of flowering plant in the knotweed family known by several common names, including Russian-vine, Bukhara fleeceflower, Chinese fleecevine, mile-a-minute and silver lace vine. It is native to Asia, and is growing wild in parts of Europe and North and Central America as an introduced species.
Potentilla norvegica is a species of cinquefoil known by the common names rough cinquefoil, ternate-leaved cinquefoil, and Norwegian cinquefoil. It is native to Europe, Asia, and parts of North America, and it can be found elsewhere as an introduced species.
Ranunculus muricatus is a species of buttercup known by the common names rough-fruited buttercup and spinyfruit buttercup. It is native to Europe, but it can be found in many other places in the world, including parts of Africa, Australia, and the western and eastern United States, as an introduced species and agricultural and roadside weed. It grows in wet habitats, such as irrigation ditches. It is an annual or sometimes biennial herb producing a mostly hairless stem up to half a meter long which may grow erect or decumbent along the ground. The leaves have blades a few centimetres in length which are deeply divided into three lobes or split into three leaflets. They are hairless to hairy in texture, and are borne at the tips of long petioles. The flower has five shiny yellow petals under 1 centimetre (0.4 in) long around a lobed central receptacle studded with many stamens and pistils. The fruit is a spiny achene borne in a spherical cluster of 10 to 20.
Stachys arvensis is a species of flowering plant in the mint family known by the common names field woundwort and staggerweed. It is native to Europe, Western Asia, and North Africa. It is known on other continents as an introduced species and widespread weed.
Veronica anagallis-aquatica is a species of flowering plant in the family Plantaginaceae known by the common names water speedwell, blue water-speedwell,brook pimpernel, and sessile water-speedwell. It is also listed as Veronica catenata. Its true native range is not clear, but the plant is present on most continents, and in most places it is probably naturalized. It occurs in many types of moist and wet habitat, and it is semi-aquatic, often growing in shallow water along streambanks, in ponds, and in other wetland environments. It is a rhizomatous perennial herb with stems growing 10 centimeters to about a meter in maximum length. It may be decumbent, the stem spreading along the ground and rooting where it touches moist substrate, or erect in form. The oppositely arranged leaves are green, smooth-edged or toothed, and sometimes clasping the stem where the leaf pairs meet at the bases. The inflorescence is a raceme of many flowers arising from the leaf axils. Each flower is borne on a short, curving pedicel. The flower corolla is up to a centimeter wide with four lobes, the upper lobe being widest. It is blue, lavender, or violet with purple lines near the base of each lobe. At the center are two small protruding stamens.
Veronica filiformis is a species of flowering plant in the family Plantaginaceae. It is known by many common names, including slender speedwell, creeping speedwell, threadstalk speedwell and Whetzel weed. It is native to eastern Europe and western Asia, and it is known in many other regions as an introduced species.
Veronica scutellata is a species of flowering plant in the plantain family known by the common names marsh speedwell, skullcap speedwell, and grassleaf speedwell. It is native to temperate Asia, Europe, northern Africa, and northern North America, including most of Canada and the northern half of the United States. It occurs in moist and wet habitats, such as ponds, marshes and other wetlands. It is a rhizomatous herbaceous perennial producing a decumbent or upright stem 40–60 cm (16–24 in) in maximum height. It is mostly hairless in texture. The purple-green or reddish leaves are oppositely arranged in pairs about the stem, the blades lance-shaped and smooth-edged. The inflorescence is an open array of several flowers on thin, straight pedicels. The flower is up to 1 cm (0.39 in) wide with four lobes, the upper lobe being largest. It is white, blue, or purplish with purple veining. It yields a flat, notched capsule a few millimeters wide.
Veronica perfoliata, commonly known as digger's speedwell, is a common perennial herb found at higher altitudes in south-eastern Australia. It is a low-growing multi-stemmed plant rising from a woody rootstock. It has rounded blue-grey foliage and sprays of intense violet-blue flowers at the end of arching branches. It is occasionally cultivated as a garden plant.
Veronica austriaca, the broadleaf speedwell, large speedwell, Austrian speedwell, or saw-leaved speedwell, is a species of flowering plant in the plantain family Plantaginaceae, native to northern temperate Europe. Growing to 90 cm (35 in) tall by 60 cm (24 in) broad, it is a mound-forming herbaceous perennial, with deeply toothed leaves and erect spikes of bright blue flowers throughout summer.
Cyclachaena xanthiifolia, known as giant sumpweed, or rag sumpweed is a North American plant species in the sunflower family, Asteraceae. It is the only species in the genus Cyclachaena. Giant sumpweed is believed to be native to the Great Plains but is now found across much of southern Canada and the contiguous United States, though rarely in the Southeast.
