Treatments of Polygonum and related genera (subfamily Polygonoideae) those by Haraldson and Ronse Decraene & Akeroyd, have segregated species of Polygonum in the broad sense adopted into two separate tribes, Polygoneae and Persicarieae. The remainder of Polygonum in the broad sense is generally assigned to Persicaria (or a varying number of segregate genera, such as Aconogonon and Bistorta) which, with Antenoron and Koenigia, comprises the tribe Persicarieae.
Characters for segregation of Two species:
Polygonum: . Flowers axillary, solitary or in small clusters, sometimes forming lax leafy spikes. Perianth (4- or)5-parted, not enlarged in fruit. Stamens 5-8, reduced in number in outer whorl; filaments, especially the inner, strongly dilated at base.
Persicaria: Inflorescence spicate, spikes usually several. Tepals fused for about 1/3 their length. Nectaries free, globular. Styles 1, bifid or trifid.


 

From
Floral Database of Tamilnadu
: 

 

Binomial Habit Notes References Distribution Common name
Persicaria attenuata ( R.Br. ) Sojak subsp. pulchra ( Blume ) K.L.Wilson (Syn: Polygonum pulchrum Blume ) Herb Aquatic Flora of Tamil
Nadu, VOL. II, 1987
Coimbatore,
Theni,  Tirunelveli, Vellore
 
Persicaria barbata ( L. ) H.Hara var. barbata Herb Plains
to Mid Altitude, Aquatic
Flora
of Tamil Nadu, VOL. II, 1987
Coimbatore,
Cuddalore, Kanniyakumari, Madurai, Nilgiri, 
Theni, Tirunelveli, Tiruvannamalai 
Aattralari
Persicaria barbata ( L. ) Hara var. gracilis (
Danser ) H.Hara
Herb Plains
to Mid Altitude, Aquatic
Flora
of Tamil Nadu, VOL. II, 1987
Coimbatore,
Dindigul , Theni 
 
Persicaria barbata ( L. ) Hara var. stagnina (  Buch.-Ham. ex Meisn.) S.K.Dixit , B.Datt & G.P.Roy is a synonym of Persicaria stagnina (Buch.-Ham. ex Meisn.) Qaiser Undershrub Plains,
Aquatic 
Flora
of Tamil Nadu, VOL. II, 1987; Fischer 1921
Coimbatore  
Persicaria capitata ( Buch.-Ham. ex D.Don ) H.Gross Herb Western
Ghats, Evergreen Forests
Flora
of Tamil Nadu, VOL. II, 1987
Nilgiri  
Persicaria chinensis ( L. ) H.Gross Undershrub Western
Ghats & Eastern Ghats, Moist Deciduous to Evergreen Forests
Flora
of Tamil Nadu, VOL. II, 1987
Coimbatore,
Dindigul, Kanniyakumari, Namakkal, Nilgiri,  
Salem,  Theni, Tirunelveli
 
Persicaria dichotoma (Blume) S.K.Dixit , B.Datt & G.P.Roy Herb Western
Ghats, Evergreen Forests
Flora
of Tamil Nadu, VOL. II, 1987
Nilgiri,
Theni
 
Persicaria hydropiper ( L. ) Spach subsp. flaccida ( Meisn. ) Munshi &
Javeid
Herb Western
Ghats, Evergreen Forests, Marsh Localities
Flora
of Tamil Nadu, VOL. II, 1987
Coimbatore,
Dindigul, Nilgiri, Theni
 
Persicaria hydropiper (L.) Spach var. hydropiper  Herb Western
Ghats, Evergreen Forests, Marsh Localities
Flora
of Tamil Nadu, VOL. II, 1987; Gamble 1957
Coimbatore,  Dindigul, 
Nilgiri
 
Persicaria lapathifolia (L.) Gray var. lanigera (
R.Br.) Chantar. & Tubtimtong
Creeping
Herb
Western
Ghats, Evergreen Forests, Marsh Localities
Flora
of Tamil Nadu, VOL. II, 1987; Gamble 1957
Coimbatore  
Persicaria nepalensis ( Meisn. ) H.Gross Herb Western
Ghats, Evergreen Forests/ Naturalized, Native of Himalayas
Flora
of Tamil Nadu, VOL. II, 1987; Gage 1903
Coimbatore,
Dindigul, Kanniyakumari, Nilgiri, Theni 
Kangani
machan-pillu
Persicaria peduncularis (Meissner) Nemato is a synonym of Persicaria dichotoma (Blume) Masam. Herb Eastern
Ghats, Marsh Localities
  Salem  

  

From Floral Database of Tamilnadu :

Binomial Habit Notes References Distribution
Polygonum dichotomum Blume (= Persicaria dichotoma (Blume) Masam.) var. angustissima (Hook.f.) Chandrasekaran Herb Western Ghats, Evergreen Forests Flora of Tamil Nadu, VOL. II, 1987 Nilgiri
Polygonum dichotomum Blume (= Persicaria dichotoma (Blume) Masam.) var. nilagirica (Hook.f.) Chandrasekaran Herb Western Ghats, Evergreen Forests Flora of Tamil Nadu, VOL. II, 1987; Gage 1903 Dindigul, Nilgiri
Polygonum dichotomum Blume (= Persicaria dichotoma (Blume) Masam.) var. robusta (Hook.f.) Chandrasekaran Herb Western Ghats & Eastern Ghats, Evergreen Forests Flora of Tamil Nadu, VOL. II, 1987 Nilgiri, Salem, Theni
Polygonum glabrum Willd. var. glabrum = Persicaria glabra (Willd.) M. Gómez Herb Plains, Aquatic Flora of Tamil Nadu, VOL. II, 1987 All districts
Polygonum glabrum Willd. var. scabrinervis Hook.f. Herb Western Ghats, Evergreen Forests Flora of Tamil Nadu, VOL. II, 1987 Dindigul
Polygonum minus Huds. = Persicaria minor (Huds.) Opiz Herb Western Ghats, Evergreen Forests, Marsh Localities Flora of Tamil Nadu, VOL. II, 1987; Gage 1903 Coimbatore, Dindigul, Nilgiri, Tirunelveli
Polygonum orientale L. = Persicaria orientalis (L.) Spach Herb Western Ghats & Eastern Ghats, Moist Deciduous Forests, Marsh Localities Flora of Tamil Nadu, VOL. II, 1987 Dindigul,Namakkal, Theni, Tiruvannamalai, Vellore,Viluppuram
Polygonum plebeium R. Br. Herb Plains to High Altitude, Dry Localities Flora of Tamil Nadu, VOL. II, 1987 All districts
Polygonum sphaerocephalum Wall.ex Meisner is a synonym of Polygonum microcephalum var. sphaerocephalum (Wall. ex Meisn.) H. Hara Creeping Herb Western Ghats, Evergreen Forests Flora of Tamil Nadu, VOL. II, 1987 Nilgiri, Theni
Polygonum strigosum R. Br. is a synonym of Persicaria strigosa (R.Br.) Nakai Herb Western Ghats, Evergreen Forests, Marsh Localities Flora of Tamil Nadu, VOL. II, 1987 Dindigul,Nilgiri, Theni

 

Polygonum flaccidum ROXB. (? Polygonum flaccidum Meisn.is a synonym of Polygonum pubescens Blume)
Polygonum posumbi HAM. = Persicaria posumbu (Buch.-Ham. ex D. Don) H. Gross

 

Species with description &
pictures in Flowers of India
as on 8.1.14:

Botanical name Synonyms Family Common name


























































Persicaria barbata Polygonum barbatum Polygonaceae Bearded Knotweed
Persicaria capitata Polygonum capitatum Polygonaceae Pink Knotweed
Persicaria chinensis Polygonum chinense, Polygonum auriculata Polygonaceae Chinese Knotweed
Persicaria glabra Polygonum glabrum Polygonaceae Denseflower Knotweed
Persicaria hydropiper Polygonum hydropiper Polygonaceae Water Pepper
Persicaria lapathifolia Polygonum lapathifolium Polygonaceae Pale Knotweed
Persicaria maculosa Polygonum persicaria Polygonaceae Redshank
Persicaria minor Polygonum minus Polygonaceae Small Water-Pepper
Persicaria nepalensis Polygonum nepalense Polygonaceae Nepal Knotweed
Persicaria orientalis Polygonum orientale Polygonaceae Kiss Me Over The Garden Gate
Persicaria orientalis Polygonum orientale Polygonaceae Oriental Pepper
Persicaria serrulata is a synonym of Persicaria decipiens (R.Br.) K.L.Wilson Polygonum salicifolium, Persicaria salicifolia Assenov Polygonaceae Willowleaf Knotweed

Polygonum pubescens = Persicaria pubescens (Blume) H. Hara Persicaria pubescens, Polygonum flaccidum, Polygonum roettleri Polygonaceae Drooping Knotweed

 

Persicaria polystachya = Rubrivena polystachya (Wall. ex Meisn.) M. Král
Polygonum capitatum = Persicaria capitata (Buch.-Ham. ex D. Don) H. Gross
Polygonum posumbu = Persicaria posumbu (Buch.-Ham. ex D. Don) H. Gross
  
Persicaria 1 post by 1 author.

I have updated eFI (efloraofindia) page on Persicaria

Attempts have been made to incorporate most of the species available in India & nearby areas with details & keys directly or through links as far as possible. It’s quite possible that there may be some discrepancy in the accepted names & synonyms taken from other databases/ books.

Species discussed so far in efloraofindia are given at the bottom of the page in the form of links against Subpages. On clicking them one can see all the details.

Any comments are welcome.


 

Flora of Davanagere District, Karnataka, India By B. K. Manjunatha, V. Krishna, T. Pullaiah (2004)- Details with keys
 
 
Forest Plants of Eastern India By Amal Bhusan Chaudhuri (1993)-
Polygonum islandicum (L.) Hook.f.is a synonym of Koenigia islandica L.
Polygonum perpusillum Hook. f.is a synonym of Bistorta perpusilla (Hook.f.) Greene
Polygonum sinuatum Royle ex Bab.is a synonym of Persicaria sinuata (Royle ex Bab.) Rajbh. & R.Joshi
Polygonum sphaerostachyum Meisn.is a synonym of Polygonum macrophyllum D. Don
 
Gardening in India By George Marshall Woodrow, G Marshall (1986)- Details-
 
  

I have updated eFI (efloraofindia) page on Aconogonon, Bistorta, Fagopyrum, Fallopia, Koenigia, Persicaria, Polygonum & Rubrivena

Attempts have been made to incorporate most of the species available in India & nearby areas with details & keys directly or through links as far as possible. It’s quite possible that there may be some discrepancy in the accepted names & synonyms taken from other links.

Species discussed so far in efloraofindia are given at the bottom of the page in the form of links against Subpages. On clicking them one can see all the details.

If someone can provide complete list of Indian species with source references it will be wonderful.

Any comments/ corrections are welcome.


In my opinion most of the above genera should be treated under Polygonum sensu lato.  I am working on Indian Polygonaceae but it needs thorough field work. The taxonomic complexes are to be solved with the help of SEM/Molecular studies. I have listed all Indian species but it is not yet published.


Thanks a lot, … I have taken GRIN as the basis as it relied on the latest litrature published in 2011 or 2012. Other efloras & The Plant List etc. has also been considered where ever a taxa is not available in GRIN.
As & when new findings are published it can be updated again.


 

 
 
 

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