''Parietaria'' is a genus of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants th ...

s in the family

Urticaceae The Urticaceae are a family, the nettle family, of flowering plants. The family name comes from the genus ''Urtica''. The Urticaceae include a number of well-known and useful plants, including nettles in the genus ''Urtica'', ramie (''Boehmeri ...

, native to temperate and tropical regions across the world.Flora Europaea
''Parietaria''
/ref>African Flowering Plants Database
''Parietaria'' (enter genus name in search box)
/ref>Flora of North America
''Parietaria''
/ref>Flora of China
''Parietaria''
/ref>Flora of Pakistan
''Parietaria''
/ref>Australian Plant Name Index
''Parietaria''
/ref> They are

annual Annual may refer to: *Annual publication, periodical publications appearing regularly once per year ** Yearbook ** Literary annual *Annual plant *Annual report *Annual giving *Annual, Morocco, a settlement in northeastern Morocco *Annuals (band), ...

perennial A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also wide ...

herbaceous plant Herbaceous plants are vascular plants that have no persistent woody stems above ground. This broad category of plants includes many perennials, and nearly all annuals and biennials. Definitions of "herb" and "herbaceous" The fourth edition of t ...

s growing to 20–80 cm tall, with green or pink stems. The

leaves A leaf (plural, : leaves) is any of the principal appendages of a vascular plant plant stem, stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", wh ...

are alternate, simple, entire, often with a cluster of small leaves in their axils. Individual

flower A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants (plants of the division Angiospermae). The biological function of a flower is to facilitate reproduction, usually by providing a mechani ...

s are

bisexual Bisexuality is a romantic or sexual attraction or behavior toward both males and females, or to more than one gender. It may also be defined to include romantic or sexual attraction to people regardless of their sex or gender identity, whi ...

unisexual Dioecy (; ; adj. dioecious , ) is a characteristic of a species, meaning that it has distinct individual organisms (unisexual) that produce male or female gametes, either directly (in animals) or indirectly (in seed plants). Dioecious reproductio ...

, 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 In botany, a fruit is the seed-bearing structure in flowering plants that is formed from the ovary after flowering. Fruits are the means by which flowering plants (also known as angiosperms) disseminate their seeds. Edible fruits in particu ...

is a small dry

achene An achene (; ), also sometimes called akene and occasionally achenium or achenocarp, is a type of simple dry fruit produced by many species of flowering plants. Achenes are monocarpellate (formed from one carpel) and indehiscent (they do not ope ...

Species

The Plant List The Plant List was a list of botanical names of species of plants created by the Royal Botanic Gardens, Kew and the Missouri Botanical Garden and launched in 2010. It was intended to be a comprehensive record of all known names of plant species ...

accepted only 10 species:Search for "Parietaria", *'' Parietaria cretica'' L. *''

Parietaria debilis ''Parietaria debilis'', commonly known as pellitory, small-flower pellitory, or native pellitory, is a herb native to Australia and New Zealand. Description It grows as an annual herb from 7 to 40 centimetres in height, with green or white flowe ...

'' G.Forst. (syn. ''Parietaria micrantha'' Ledeb.) *'' Parietaria floridana'' Nutt. *'' Parietaria judaica'' L. (syn. ''Parietaria diffusa'' Mert. & W.D.J.Koch) *'' Parietaria lusitanica'' L. *'' Parietaria macrophylla'' B.L. Rob. & Greenm. *'' Parietaria mauritanica'' Durieu *'' Parietaria officinalis'' L. *'' Parietaria pensylvanica'' Muhl. ex Willd. *'' Parietaria praetermissa'' B.D. Hinton Names which The Plant List did not accept but regarded as unresolved include: *''Parietaria australis'' (Nees) Blume *''Parietaria cardiostegia'' Greuter *''Parietaria filamentosa'' Webb & Berthel. *'' Parietaria hespera'' B.D.Hinton *''Parietaria laxiflora'' Engl. *''Parietaria ruwenzoriensis'' Cortesi Other species have been moved to different genera: *''Parietaria alsinifolia'' Delile = '' Freirea alsinaefolia'' (Delile) Gaudich. Several species can be

weed A weed is a plant considered undesirable in a particular situation, "a plant in the wrong place", or a plant growing where it is not wanted.Harlan, J. R., & deWet, J. M. (1965). Some thoughts about weeds. ''Economic botany'', ''19''(1), 16-24. ...

s; the Mediterranean species ''P. judaica'' is widely

naturalised Naturalization (or naturalisation) is the legal act or process by which a non-citizen of a country may acquire citizenship or nationality of that country. It may be done automatically by a statute, i.e., without any effort on the part of the i ...

in the Americas, while the American ''P. pensylvanica'' is conversely naturalised in Europe.

References

{{taxonbar , from=Q163536 Urticaceae genera Taxa named by Carl Linnaeus