Overview

Distribution

Range Description

Persicaria barbatum ranges from Saudi Arabia and Yemen to eastern Asia, Himalayas to western and South China, Bhutan, India, Indonesia, Malaysia, Myanmar, Nepal, New Guinea, Philippines, Sri Lanka, Thailand and Viet Nam.
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Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hubei, Hunan, Jiangxi, Sichuan, Taiwan, Yunnan [Bhutan, India, Indonesia, Malaysia, Myanmar, Nepal, New Guinea, Philippines, Sikkim, Sri Lanka, Thailand, Vietnam].
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Physical Description

Morphology

Description

Erect, 30-60 (-75) cm tall, sometimes decumbent or prostrate simple-branched, annual, herb. Stem glabrous, lineolate-canaliculate. Leaves 1.5-15 x 0.25-3.0 cm, linear to linear-lanceolate, acuminate, glabrous except margin, midrib and veins ciliate, sessile to subsessile, petiole 2-4 (-6) mm long. Ochrea 1.0-3.5 cm long, tubular, brownish, strigose, cilia equalling or larger than the ochreae. Inflorescence 5-10 cm long, many flowered, branched raceme with 1-6 spikes in each raceme, peduncle 0.5-3.0 (-5.0) cm long, glabrous. Flowers white, 1.0-2.0 mm across, pedicel, 0.75-1.5 mm long. Ochreolae 1.5-3.5 mm long, tubular, ovate, compact, not intrerrupted, ciliate, ciliae almost the same size as that of ochreolae. Tepals 5, 1.5-2.5 x 0.75-1.25 cm, oblanceolate-obovate, obtuse, biseriate, unequal, eglandular. Stamens 5-8, filaments long, equal. Ovary 1.0-2.0 x 0.75-1.5 mm, broadly ovate-orbicular, trigonous, styles three, long, filiform and free till half of the length with capitate stigmas. Nuts trigonous, 1.8-2 (-2.25) x 1.2-1.5 mm, glabrous, black, shining. 

 In our area, following two varieties are recognized:

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Description

Herbs perennial, rhizomatous. Stems erect, 40-90 cm tall, robust, pubescent, simple or branched above. Petiole 5-8 mm, densely hispidulous; leaf blade lanceolate or elliptic-lanceolate, 7-15 × 1.5-4 cm, both surfaces pubescent, base cuneate, margin ciliate, apex acuminate; ocrea tubular, 1.5-2 cm, membranous, densely hispidulous, apex truncate, cilia 1.5-2 cm. Inflorescence terminal, spicate, erect, 4-8 cm, several spikes aggregated and panicle-like, rarely solitary; bracts funnel-shaped, glabrous, margin ciliate, each 3-5-flowered. Pedicel short. Perianth white or greenish, 5-parted; tepals elliptic, 1.5-2 mm. Stamens 5-8, included. Styles 3; stigmas capitate. Achenes included in persistent perianth, black, shiny, ovoid, trigonous, 1.5-2 mm. Fl. Aug-Sep, fr. Sep-Oct. 2n = 60.
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Diagnostic Description

Synonym

Polygonum barbatum L., Sp. Pl. 362. 1753; Hook. f., Fl. Brit. Ind. 5: 37. 1886; Schiman-Czeika & Rech.f in Rech.f., Fl. Iran. 56.56. 1966; R.R.Stewart, Ann.Cat.Vasc. Pl. W. Pak. & Kashm. 204. 1972; Bhopal & Chaudhri in Pak. Syst. 1(2): 78. 1977; Polygonum hispidum Buch.-Ham. ex D. Don, Prodr. Fl. Nep. 71. 1825 non Humb., Boupl. & Kunth 1828.
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Synonym

Persicaria barbata (Linnaeus) H. Hara; P. omerostroma (Ohki) Sasaki; Polygonum kotoshoense Ohki; P. omerostromum Ohki.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
The plant is a well-known reed swamp that typically grows along the margins and banks of streams.

Systems
  • Freshwater
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Streamsides, wet areas, water sides; sea level to 1300 m.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Polygonum barbatum

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Polygonum barbatum

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 5
Species With Barcodes: 1
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Statistics of barcoding coverage: Persicaria barbata

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 2
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2013

Assessor/s
Gupta, A.K.

Reviewer/s
García, N.

Contributor/s
Molur, S., Dahanukar, N., Rao, M.L.V. & Bhat, G.K.

Justification
This species is assessed as Least Concern because it is widespread and does not face any major threats.
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Population

Population
There is no information available on population trends in this species.

Population Trend
Unknown
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Threats

Major Threats
There are no known significant past, ongoing of future threats to this species.
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Management

Conservation Actions

Conservation Actions
There are no conservation measures in place or needed.
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