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Ludwigia peploides
''Ludwigia peploides'',''L. peploides'', is a species of flowering plant in the evening primrose family known by the common names floating primrose-willow and creeping water primrose. It is native to many parts of the Americas, but it can be found on many continents and spreads easily to become naturalized. It is well known as a troublesome aquatic noxious weed that invades water ecosystems and can clog waterways. This is perennial herb which grows in moist to wet to flooded areas. The stem can creep over 2 meters long, sometimes branching. It spreads to form mats on the mud, or floats ascending in the water. The leaves are several centimeters long and are borne in alternately arranged clusters along the stem. The flower has 5 to 6 lance-shaped sepals beneath a corolla of 5 or 6 bright yellow petals up to 2.4 centimeters long. The fruit is a hard, cylindrical capsule.
==Distribution==
''L. peploides'' are native almost all over the United States. It lives predominately along east and south west coast. States between Nevada, Washington, Michigan and all states north of New York do have a native species of ''L. peploides'' nor are they invasive. A country that is having a serious problem with the ''L. peploides'' are the French. It is considered the most invasive alien aquatic plants in France. They have spread all across the country at such alarming rates that it has been assigned to the German Black List of invasive species. Other counties are also wary of this incredibly invasive species so there has been a ban on the trade of ''L. peploides'' in France, Portugal, Netherlands, Belgium and the UK. These species cause serious problems in area where they have been introduced and a ban on trade will hopefully prevent any further damage.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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