# Parietaria

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***Parietaria*** is a genus of [flowering plants](/source/Flowering_plant) in the family [Urticaceae](/source/Urticaceae), native to temperate and tropical regions across the world.[1][2][3][4][5][6]

They are [annual](/source/Annual_plant) or [perennial](/source/Perennial_plant) [herbaceous plants](/source/Herbaceous_plant) growing to 20–80 cm tall, with green or pink stems. The [leaves](/source/Leaf) are alternate, simple, entire, often with a cluster of small leaves in their axils. Individual [flowers](/source/Flower) are [bisexual](/source/Plant_sexuality#bisexual) or [unisexual](/source/Plant_sexuality#unisexual), produced in clusters of three to many together in the leaf axils. Plants have either bisexual flowers or both staminate ("male") and carpellate ("female") flowers. The [fruit](/source/Fruit) is a small dry [achene](/source/Achene).[3][4][5]

## Species

As of November 2013, [The Plant List](/source/The_Plant_List) accepted only 10 species:[7]

- *[Parietaria cretica](/source/Parietaria_cretica)* L.
- *[Parietaria debilis](/source/Parietaria_debilis)* G.Forst. (syn. *Parietaria micrantha* Ledeb.)
- *[Parietaria floridana](/source/Parietaria_floridana)* Nutt.
- *[Parietaria judaica](/source/Parietaria_judaica)* L. (syn. *Parietaria diffusa* Mert. & W.D.J.Koch)
- *[Parietaria lusitanica](/source/Parietaria_lusitanica)* L.
- *[Parietaria macrophylla](/source/Parietaria_macrophylla)* B.L. Rob. & Greenm.
- *[Parietaria mauritanica](/source/Parietaria_mauritanica)* Durieu
- *[Parietaria officinalis](/source/Parietaria_officinalis)* L.
- *[Parietaria pensylvanica](/source/Parietaria_pensylvanica)* Muhl. ex Willd.
- *[Parietaria praetermissa](/source/Parietaria_praetermissa)* B.D. Hinton

Names which The Plant List did not accept but regarded as unresolved As of November 2013 include:[7]

- *Parietaria australis* (Nees) Blume
- *Parietaria cardiostegia* Greuter
- *Parietaria filamentosa* Webb & Berthel.
- *[Parietaria hespera](/source/Parietaria_hespera)* B.D.Hinton
- *Parietaria laxiflora* Engl.
- *Parietaria ruwenzoriensis* Cortesi

Other species have been moved to different genera:[7]

- *Parietaria alsinifolia* Delile = *[Freirea alsinaefolia](/source/Freirea_alsinaefolia)* (Delile) Gaudich.

Several species can be [weeds](/source/Weed); the Mediterranean species *P. judaica* is widely [naturalised](/source/Naturalisation_(biology)) in the Americas, while the American *P. pensylvanica* is conversely naturalised in Europe.[1][3]

## References

1. Flora Europaea: [*Parietaria*](http://rbg-web2.rbge.org.uk/cgi-bin/nph-readbtree.pl/feout?FAMILY_XREF=&GENUS_XREF=Parietaria&SPECIES_XREF=&TAXON_NAME_XREF=&RANK=)

1. African Flowering Plants Database: [*Parietaria* (enter genus name in search box)](http://www.ville-ge.ch/cjb/bd/africa/resultat.php)

1. Flora of North America: [*Parietaria*](http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=124051)

1. Flora of China: [*Parietaria*](http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=124051)

1. Flora of Pakistan: [*Parietaria*](http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=124051)

1. Australian Plant Name Index: [*Parietaria*](http://www.anbg.gov.au/cgi-bin/apni?taxon_name=Parietaria%20%25) [Archived](https://web.archive.org/web/20190913062036/http://www.anbg.gov.au/cgi-bin/apni?taxon_name=Parietaria%20%25) 2019-09-13 at the Wayback Machine

1. Search for "Parietaria", ["The Plant List"](http://www.theplantlist.org/), retrieved 2013-11-02

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Adapted from the Wikipedia article [Parietaria](https://en.wikipedia.org/wiki/Parietaria) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Parietaria?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.