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''Parietaria'' is a genus of flowering plants in the family Urticaceae, native to temperate and tropical regions across the world.〔Flora Europaea: (''Parietaria'' )〕〔African Flowering Plants Database: (''Parietaria'' (enter genus name in search box) )〕〔Flora of North America: (''Parietaria'' )〕〔Flora of China: (''Parietaria'' )〕〔Flora of Pakistan: (''Parietaria'' )〕〔Australian Plant Name Index: (''Parietaria'' )〕 They are annual or perennial herbaceous plants growing to 20–80 cm tall, with green or pink stems. The leaves are alternate, simple, entire, often with a cluster of small leaves in their axils. Individual flowers are bisexual or 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 is a small dry achene.〔〔〔 ==Species== , The Plant List accepted only 10 species:〔Search for "Parietaria", 〕 *''Parietaria cretica'' L. *''Parietaria debilis'' 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 weeds; the Mediterranean species ''P. judaica'' is widely naturalised in the Americas, while the American ''P. pensylvanica'' is conversely naturalised in Europe.〔〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Parietaria」の詳細全文を読む スポンサード リンク
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