Polygonaceae

Water-pepper

Persicaria hydropiper (L.) Delarbre

Family: Polygonaceae
Genus: Persicaria

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Water-pepper (Persicaria hydropiper) — FlowerPhoto: scallions, CC BY 4.0, from iNaturalist

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Common names

By language (53)

Arabic: فلفل الماء, بطباط المستنقعات, زنجبيل الكلاب, فلفل ماء, فليفلة زراعية
Armenian: Մատիտեղ ջրային
arz: فلفل الماء
Azerbaijani: Subibəri
ba: Һыу боросо
Bangla: বিষকাটালী
Basque: Ur-piper
Belarusian: Драсён перцавы, Вадзяная гарчыца, Гарчак, Гарчак баб'і, Драсён, Дросень, Дрост, Дрост вадзяны
Bulgarian: Водно пипериче
Catalan: Pebre d'aigua, Pebre de l'aigua
Chinese: 水蓼, 辣蓼, 水寥（水辣寥）, 水蓼根, 红辣蓼, 蓼, 蓼实
Croatian: Paprac
csb: Gòrzczi żabińc
cv: Кăвакал туни
Czech: Rdesno peprník
Dutch: Waterpeper
English: Water-pepper, Marshpepper smartweed, Water pepper, Marshpepper knotweed
Estonian: Mõru kirburohi
Finnish: Katkeratatar
French: Poivre d'Eau, Renouee Poivre d'eau, Renouée Poivre d'eau
Georgian: Წალიკა
German: Wasserpfeffer, Flohpfeffer, Pfeffer-Knöterich, Pfefferknöterich
grc: Ὑδροπέπερι
hsb: Hórka wuroć
Hungarian: Borsos keserűfű
Irish: Biorphiobar
Japanese: ヤナギタデ, たで, 蓼, タデ
Kazakh: Бұрыш самалдық
kbd: Арусыр
Korean: 여뀌
Latvian: Ūdenspipars
Lithuanian: Kartusis rūgtis
Macedonian: Пиперовидна подворка
Norwegian Bokmål: Vasspepper, Vasspepar
Norwegian Nynorsk: Vasspepar
os: Цывзыгæрдæг
Persian: فلفل آبی
Polish: Rdest ostrogorzki, Pieprz wodny, Rdest wodny
Romanian: Piper de baltă, Dintele-dracului, Piper-de-baltă, Piperul bălții, Piperul-bălții
Russian: Горец перечный, Водяной перец
se: Rihčanjuolas
Slovak: Horčiak pieprový
Slovenian: Poprasta dresen
Spanish: Pimienta acuática, Pimienta del agua, Poligonum fallacium, Poligonum glandulosum
Swedish: Bitterpilört, Bitterblad, Vattenpeppar
Tajik: Занҷабили обӣ
Tamil: குன்மகுடோரி, கும்பகோடாரி, தும்பக்கோடாரி
tly: Kunətovnə
Turkish: Su biberi
Ukrainian: Гірчак перцевий, Перець водяний, Перець собачий
Uzbek: Suvqalampir
Vietnamese: Răm nước, Nghể, Rau nghể, Thuỷ liễu, Thủy liễu
Welsh: Y dinboeth

Synonyms

Persicaria hydropiper var. diffusa Kitag.
Persicaria hydropiper var. vulgaris (Meisn.) Ohki
Persicaria urens Garsault
Persicaria vernalis Nakai
Polygonum hydropiper L.
Polygonum hydropiper var. longistachyum Y.L.Chang & S.X.Li
Polygonum hydropiper var. projectum Stanford
Polygonum hydropiper var. vulgare Meisn.
Polygonum schinzii J.Schust.

Flowers

In flower: March, July to October (from 291 flowering iNaturalist observations worldwide)

Photos

FlowerPhoto: scallions, CC BY 4.0, from iNaturalist
FlowerPhoto: cigazze, CC BY 4.0, from iNaturalist
FlowerPhoto: Sandy Wolkenberg, CC BY 4.0, from iNaturalist
FlowerPhoto: Saryu Mae 前朝琉, CC BY 4.0, from iNaturalist
Photo: No machine-readable author provided. Aroche assumed, CC BY 2.5, from Wikimedia Commons
Photo: Olivier Pichard, CC BY-SA 3.0, from Wikimedia Commons
Photo: Marta Vidal gallego, CC BY-SA 4.0, from Pl@ntNet via GBIF
Photo: Roman A. Lagazyuk (Роман А. Лагазюк), CC BY 4.0, from iNaturalist
Photo: Radio Tonreg from Vienna, Austria, CC BY 2.0, from Wikimedia Commons
Photo: 🌴Anxo🌿, CC BY-SA 4.0, from Pl@ntNet via GBIF
Photo: AnRo0002, CC0, from Wikimedia Commons
Photo: forgetlaurent, CC BY-SA 4.0, from Pl@ntNet via GBIF

More in Persicaria

Sources: classification, synonyms from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0). About our plant data.