Persicaria barbata (L.) H.Hara

Last updated: 30 Jul 2015

Scientific Name

Persicaria barbata (L.) H.Hara


Persicaria omerostroma (Ohki) Sasaki, Pogalis barbata (L.) Raf., Polygonum barbatum L., Polygonum kotoshoense Ohki, Polygonum omerostromum Ohki [1]

Vernacular Name

Malaysia Tebok seludang, johong beraleh, panchis-panchis [2], tuba seludang, seruas semalam [3]
English Common knotweed [3]
India Nirthe, tuichikte [4]
Indonesia Salah nyowo, mengkrengan (Javanese); jukut carang (Sundanese) [2][3]
Cambodia Kating he [2]
Vietnam Ng[eer] tr[aws]ng, ng[eer] r[aa]u [2]
Nepal Bish, bishalarin, nali, pire, pirejhar [4]

Geographical Distributions

Persicaria barbata is widely distributed in the tropics and subtropics of Africa, extending to India, Southeast Asia, Australia and Micronesia. [2]

It is common in soggy sunny localities along rivers and ditches, from sea level up to 1200 m altitude. [2]

Botanical Description

P. barbata is a member of the Polygonaceae family. It is a robust, rhizomatous and perennial herb that can reach up to 40-80 cm tall. The stems are creeping, ascending to erect, loosely branched, smooth or appressed pubescent. [2]

The leaves are oblong to lance-shaped, measuring 8-15 cm x 1.5-3 cm, with acute base and rarely rounded or cordate, acuminate at apex, often with a brown blotch, appressed pubescent on either surface, at least on the veins, or hairless above, with short petiole, with tubular ocrea which is appressed pubescent and with bristles 1.3-2 cm long on the upper margin. There are 2-8 pseudo-spikes at the top of the stems. They are long cylindrical, dense or lax, with the longer ones measuring 2-6 cm long which is 3 times longer than the thickness while the older ones are 7-8 mm thick. The lower ones are peduncled with obconical bracts, ciliate, appressed pubescent or hairless and 3-5-flowered. [2]

The flowers are 2-3.3 mm long, white, greenish white or pink, not accrescent after anthesis, with 6-7 stamens and 3 styles. [2]

The nutlet is 1.7 mm long, trigonous, black and shining. [2]


No documentation.

Chemical Constituent

No documentation.

Plant Part Used

No documentation.

Traditional Use

No documentation.

Preclinical Data

No documentation.

Clinical Data

No documentation.

Poisonous Management

No documentation.

Line drawing


Figure 1: The line drawing of P. barbata [2]


  1. The Plant List. Ver 1.1. Persicaria barbata (L.) H.Hara [homepage on the Internet]. c2013 [updated 2012 Apr 18; cited 2015 Jul 28]. Available from:
  2. Do NT. Persicaria barbata (L.) H. Hara In: van Valkenburg JLCH, Bunyapraphatsara N, editors. Plant Resources of South-East Asia No. 12(2): Medicinal and poisonous plants 2. Leiden, Netherlands: Backhuys Publisher; 2001. p. 413-414.
  3. Herbal Medicine Research Centre, Institute for Medical Research. Compendium of medicinal plants used in Malaysia. Volume 2. Kuala Lumpur: HMRC IMR; 2002. p. 210.
  4. Quattrocchi U. CRC world dictionary of medicinal and poisonous plants: Common names, scientific names, eponyms, synonyms, and etymology. Volume IV M-Q. Boca Raton, Florida: CRC Press; 2012. p. 497.