These species are invasive plants that have been observed in other locations, particularly southern Michigan and its bordering states. They either have not been observed in the NCCISMA geographic region, or their observation has been limited to a few isolated occurrences.
European frog-bit is a floating aquatic plant that grows primarily in slow moving water. Infestations start along the edges of rivers, lakes, and wetlands, and are known to spread and cover large areas of shallow open water. It is also known to infest ditches and block drainage. To date European frog-bit has not been found in the region of the NCCISMA. It has,however, been causing problems on the eastern side of the state.
European frog-bit roots grow very dense in thick mats just below the level of the water. The word often used to describe the underwater portions of the plant is "tangled". The above water visible portion of the plant resembles miniature water lilies. The "lily pad" leaves are 1/2" - 2 1/4" wide. The underside of the leaves are sometimes red or purplish. The plant blooms in mid-summer. Its pretty white flowers have three petals and a yellow center. The plant spreads by very strong stolons (long stems that lay on the surface and produce a new plant at the ends), and also by turions, which are buds that grow on the stolons and drop off in the fall & grow into new plants. One plant can produce more than 100 turions a year.