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Family Polygonaceae
Subsuban
Persicaria barbata (L.) H.Hara
 
KNOTWEED
Mao liao

Scientific names Common names
Persicaria barbata (L.) H.Hara  Bukakau (Bik.)
Persicaria omerostroma (Ohki) Sasaki Kanubsubang (Pamp.)
Pogalis barbata (L.) Raf. Kaykayu (If.)
Polygonum barbatum L. Saimbangan-tubig (Sul.)
Polygonum kotoshoense Ohki Sigan-lupa (Tag.)
Polygonum omerostromum Ohki Subsuban (Tag.)
  Bearded knotweed (Engl.)
  Joint weed (Engl.)
  Knot grass (Engl.)
  Smart weed (Engl.)
  Water milkwort (Engl.)
Polygonum barbatum L. is a synonym of Persicaria barbata (L.) H.Hara The Plant List
Persicaria barbata (L.) H.Hara is an accepted name The Plant List

Other vernacular names
CAMBODIA: Kating he.
CHINESE: Mao liao.
INDONESIA: Salah nyowo, Mengkrengan, Jukut carang.
MALAYSIA: Tebok seludang, Johong beraleh, Panchis-panchis.
VIETNAMESE: Ng[eer] tr[aws]ng, Ng[eer] r[aa]u.

Botany
Subsuban is an ascending, slightly hairy plant, growing to a height of 30 to 60 meters. Stipules are sheathing, and cut into long, filiform cilia which are longer than the tube. Leaves are lanceolate 10 to 15 centimeters long, smooth or nearly so except at the ciliate margins and midrib, and tapering at both ends. Inflorescence is terminal, and in the upper axils, sparingly branched, with erect, lax and peduncled racemes, 2 to 6 centimeters long, 5 to 7 millimeters in diameter. Flowers are in short, slender pedicels. Perianth is white or purplish, 2 millimeters long and without glands. Fruit is a triangular, black and shining nut.

Distribution
- In open, usually wet places at low and medium altitudes, up to 1,400 meters in some regions, throughout the Philippines.
- Also occurs in Africa, India, Malaya, Bangladesh, Thailand, and in many other countries in South-East Asia.

Constituents
- Study of aerial parts yielded sitosterone, viscozulenic acid, and acetophenone.
- Study isolated flavanones from chloroform and ethyl acetate extracts of leaves.
- Study of Polygonum barbatum var. barbata yielded sitosterone from a petroleum ether fraction, and viscozulenic acid and acetophenone from the chloroform fraction of methanol extract of aerial parts. (15)

Properties
- Considered astringent, carminative, parasiticide.
- Root considered astringent and cooling.


Parts used
Leaves, seeds, and roots.|

Uses
Edibility
- Young leaves and shoots cooked as vegetable.
Folkloric
- Sap of pounded leaves applied to wounds is considered an effective cicatrizant.
- In Malabar and Canara seeds are used to relieve colic pains.
- Roots are used as astringent.
- In China decoction of leaves and stems used to wash wounds and ulcers.
- Sap applied to wounds as antiseptic.

- Paste of roots used for treatment of scabies.
- Seeds used for treatment of dysentery and cholera.

Studies
Anti-Ulcer:
A study on the aqueous and methanolic leaf extracts of P barbatum showed reduction of gastric volume, total acidity, free acidity and ulcer index. The antiulcer activity may be due to the presence of flavanoids and tannins. (1)
Anti-Ulcer: Study evaluated the antiulcer activity of a leaf extract on aspirin-and-pylorus ligation and aspirin-induced ulcer models. Results showed antiulcer activity with significant decrease in ulcer index, acidity, volume and increase in pH of gastric content. (6)
Wound-Healing:
A study of wound healing on albino rats of Wistar strain showed a significant increase in wound closure rate, tensile strength and decrease in epithelization period in PB treated group. Study concludes that ethanolic extract of P B had greater wound healing activity than nitrofurazone ointment.   (2)
Phytochemical :
Study of aerial parts yielded sitosterone, acetophenone, and viscozulenic acid. Acetophenone is used extensively as a food additive to create various food fragrances, and is also known to possess hypnotic and anticonvulsant property.
Brine Shrimp Toxicity / Spasmolytic / Cholinergic / Aerial Parts:
Study screened aerial parts of Polygonum barbatum for biological activities. A dichlormethane extract showed marked brine shrimp toxicity. The extract also showed dose-dependent spasmolytic effect on rabbit jejunum that is devoid of any relaxant effect . A methanol extract showed dose-dependent cholinergic effect that is atropine sensitive. (7)
Antimicrobial / Leaves:
Study screened Polygonum barbatum for antimicrobial activity. An ethanolic leaf extract showed considerable broad spectrum activity against gram positive, gram negative and fungal organisms. (8)
Wound Healing / Whole Plant:
Study of whole plant extracts on two wound models (excision wound model and incision wound model) showed wound healing properties comparable with Providone iodine. The aqueous extract was found to be more effective. (9)
Antioxidant:
Study evaluated a leaf extract for in-vitro antioxidant activity. The PBLE contained a noticeable amount of total phenols. Results showed concentration-dependent antioxidant activity. An ethanolic extract showed significant antioxidant activity and a better source of natural antioxidants.
(10)
Antinociceptive / Anti-Inflammatory / Diuretic:
Study evaluated the antinociceptive, anti-inflammatory and diuretic properties of extracts of P. barbatum (L.) Hara var. barbata in mice/rat models. Results showed dose dependent analgesic effect in acetic acid induced writhing test in mice. Petroleum ether extract showed highest anti-inflammatory activity using carrageen-induced edema test. An ethyl acetate extract showed significant diuretic effect comparable to standard agent furosemide. (14)


Availability
Wildcrafted.

Godofredo U. Stuart Jr., M.D.


Last Update September 2016


Photos © Godofredo Stuart / StuartXchange

Additional Sources and Suggested Readings
(1)
A PRELIMINARY STUDY ON GASTRIC ANTIULCER ACTIVITY OF POLYGONUM BARBATUM LINN IN RATS / Pharmacologyonline 3: 520-528 (2008)

(2)
EVALUATION OF WOUND HEALING ACTIVITY OF POLYGONUM BARBATUM LINN IN WISTAR ALBINO RATS / Nithya V et al /

(3)
Polygonum barbatum - L. / Joint Weed / Plants For A Future
(4)
Phytochemical Studies on Polygonum barbatum (L.) Hara var. barbata (Polygonaceae) / M Abdul Mazid, Bidyut K Datta et al / Rec. Nat. Prod. 5:2 (2011) 143-146
(5)
Polygonum barbatum L. / Chinese names / Catalogue of Life, China
(6)
ANTI-ULCER EVALUATION OF POLYGONUM BARBATUM LINN LEAF EXTRACT / Queen, Rosary Sheela X; Arockiasamy, P; Jeba, Singh D; Ilavarasan, R; Alex, Ramani V / International Journal of Pharmacy & Pharmaceutical Sciences;Oct2011, Vol. 3 Issue 4, p81
(7)
BIOLOGICAL ACTIVITIES OF POLYGONUM BARBATUM / Bashir Ahmad Chaudhry*, Muhammad Younas Syad, Khalid Hussain Janbaz, Altaf Ahmad Dasti and Bashir Ahmad Loothar / Journal of Research (Science), Bahauddin Zakariya University, Multan, Pakistan. Vol.14, No.2, December 2003, pp. 169-175
(8)
ANTIMICROBIAL SCREENING OF POLYGONUM BARBATUM LEAF EXTRACT
/ . QUEEN ROSARY SHEELA,* V. ALEX RAMANI / Int J Curr Pharm Res, Vol 3, Issue 3, 117­118
(9)
WOUND HEALING ACTIVITY OF POLYGONUM BARBATUM LINN. (WHOLE PLANT) / Hitesh Kumar Kinger*, Mahesh Kumar Gupta / WORLD JOURNAL OF PHARMACY AND PHARMACEUTICAL SCIENCES Hitesh et al. World Journal of Pharmacy and Pharmaceutical Sciences
Volume 1, Issue 3, 1084-1091.
(10)
IN-VITRO ANTIOXIDANT ACTIVITY OF POLYGONUM BARBATUM LEAF EXTRACT
/ QUEEN ROSARY SHEELA X*, ALEX RAMANI V / Asian Journal of Pharmaceutical and Clinical Research Vol. 4, Suppl 1, 2011
(11)
Persicaria barbata / Vernacular names / GLOBinMED
(12)
Polygonum barbatum L. (accepted name) / Chinese name / Catalogue of Life, China
(13)
Persicaria barbata / Synonyms / The Plant List
(14)
Antinociceptive, anti-inflammatory and diuretic properties of Polygonum barbatum (L.) Hara var. barbata / M. Abdul Mazid; Bidyut K. Datta; Lutfun Nahar; S. A. M. Khairul Bashar; Sitesh C. Bachar; Satyajit D. Sarker* / Rev. bras. farmacogn. vol.19 no.3 João Pessoa July/Sept. 2009 / http://dx.doi.org/10.1590/S0102-695X2009000500017
(15)
Phytochemical Studies on Polygonum barbatum (L.) Hara var. barbata (Polygonaceae). / Mazid, M. Abdul; Datta, Bidyut K.; Nahar, Lutfun; Bashar, S. A. M. Khairul; Bachar, Sitesh C; Sarker, Satyajit D. / Natural Products, 2011, Vol. 5 Issue 2, p143-146.

It is not uncommon for links on studies/sources to change. Copying and pasting the information on the search window or using the DOI (if available) will often redirect to the new link page.

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