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It is widely grown in temperate climates as an ornamental plant for annual bedding or as a container plant. It requires ample sunlight and well-drained soils. It requires almost no attention and spreads itself very easily. In places with old architecture it can grow between the stones of the road or sidewalk.
The yellow flowers have five regular parts and are up to 6 millimetres (1 ⁄ 4 inch) wide. Depending upon rainfall, the flowers appear at any time during the year. The flowers open singly at the center of the leaf cluster for only a few hours on sunny mornings. The tiny seeds [5] are formed in a pod that opens when the seeds mature.
Viola rafinesquei (syn. Viola bicolor), commonly known as the American field pansy or wild pansy, is an annual plant in the violet family found throughout much of North America. [2] There has been some debate as to whether the plant is native there or if it was introduced from the Old World as a variety of Viola kitaibeliana , but it is now ...
About 3,800 additional non-native species of vascular plants are recorded as established outside of cultivation in the U.S., as well as a much smaller number of non-native non-vascular plants and plant relatives. The United States possesses one of the most diverse temperate floras in the world, comparable only to that of China.
The plant can be found in many areas of the south, central, and midwestern United States. It can often be found growing on the sides of roads, particularly on southern exposures, needing full sun and ample moisture during its short growing season. The mature plants often grow and flower in mowed areas.
It is a herbaceous perennial with glabrous stems 10–100 cm long that bear terminal or axillary racemes or spikes of soft violet flowers. The leaves are 1.5–8 cm long and 3 to 20 times as long as wide, short-petiolate, glabrous, serrate to almost entire. [4] The plant can be confused with Scutellaria (skullcap) and other members of the mint ...
It is an invasive species in North America. [1] Its natural habitat is wet grasslands, streambanks, and trailsides. [2] It is tolerant of disturbance, and can be found in areas such as cultivated fields, sidewalk cracks, and waste ground. [2] [3] It is a very common species in Japan. [4] It is an upright annual growing to 30 cm tall.
The flowers that it produces are about 1 inch in diameter and folious (tall and "spike"-like), green to yellow with purple speckles. It is a perfect and complete flower, with four stamens and two carpels. [3] The oblong-shaped seed capsule has a brownish color and is about 1/2 inch long. The entire plant can reach heights over 2 metres (7 ft).