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(Parietaria Judaica) A perennial herb with erect, reddish-green stems about 80cm tall that comes originally from Europe, western and central Asia and northern Africa. A common weed along roadsides and in gardens, especially where there is seepage, it is a declared noxious weed in the Sydney area. It produces a central, greenish female flower and bisexual flowers on its laterals. The pollen may cause a severe allergic reaction in some people, hence its common name. It spreads mainly by seed dispersed by animals, people and also machinery. It is also a weed in New Zealand as well as North and South America.

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