Bidens tripartita
See also: Hemp of water
The bident with tripartite sheets or bident tripartite ( Bidens tripartita ) is a herbaceous Plante of the family of the Asteraceae . It is a common species in the wet places of Europe and Occidental Asia. It is also sometimes called Chanvre of water.
The generic name, bident, of the Latin bidens refers to the constitution of the fruits which generally comprise two edges at their top. The specific name, tripartita , point out the shape of the sheets generally divided into three.
Vernacular names: water hemp, watery hemp, cornuet, eupatoire watery.
Description
Bident tripartite is an annual herbaceous plant being able to reach 80 centimetres in height. The system racinaire is of the swivelling type.The sheets, glabrous, opposed, all are cogged and more or less divided, generally in three lobes, sometimes five, even in distinct leaflets. The petioles are very short and winged.
The inflorescences are drawn up flowerheads, from 10 to 20 mms in diameter, gathering tubular florets of yellow color. The Involucre comprises the bractée green ones spread out overflowing largely of the flowerhead. The flowerheads themselves are gathered in ramified inflorescence of dichotomic type, forming a Cyme bipare. Flowering takes place from June to October.
The fruits are Akène S from 5 to 6 mm length, provided with two or three edges at the top. these bearded edges easily cling to the hairs mammals, thus ensuring their dispersion (zoochorie).
Distribution and habitat
Bident tripartite is originating in the moderate areas of the old world: Europe, North Africa and Asia. One meets it in the majority of the countries of Europe, Finland in Portugal and British Isles in the Ukraine. In Asia one finds it from the Middle East and the Central Asia as far as the Far East (China, Japan), like in the Indian sub-continent.The species was naturalized in the other continents.
It is a species of plain, preferring the wet grounds. It is the dominant species, in company of other Bidens , of the Bidention tripartitae , vegetable grouping present on banks of the rivers and the ponds in alluvial grounds rich in silts and nitrates.
Use
It is a species considered as a bad grass. Its root would have been used formerly against the bites of scorpions.
External bonds
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