Bistorta macrophylla (D.Don) Soják, Preslia 46: 152 1974. (Syn: (=) Bistorta sphaerostachya (Meisn.) Greene; (≡) Polygonum macrophyllum D. Don (basionym); (=) Polygonum sphaerostachyum Meisn.);
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Himalaya to Central China and N. Myanmar: Assam, China North-Central, China South-Central, East Himalaya, Myanmar, Nepal, Tibet, West Himalaya as per POWO;
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Common name: Large-Leaf Knotweed, Red Knotweed • Nepali: मोन्जा Monza, Dalle ghans, Dalle jhar
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As per flora of China, one of the major differences between B. vivipara and B. macrophylla is the presence of bulbills in the lower parts of the inflorescence in P. vivipara.
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Herbs perennial. Rhizomes curved, large, 1-2 cm in diameter. Stems 2 or 3 from rhizome, erect, 8-30 cm tall, simple. Basal leaves petiolate; petiole 3-8 cm; leaf blade gray-green abaxially, green adaxially, oblong or lanceolate, 3-11 cm long, 1-3 cm wide, abaxially sometimes sparsely pubescent, adaxially glabrous, base subcordate or cuneate, margin with thickened vein tips, revolute, apex acute. Cauline leaves shortly petiolate or subsessile; leaf blade narrowly lanceolate or linear; ocrea: lower part green, upper part brown, tubular, membranous, apex oblique, dehiscent, not ciliate. Inflorescence terminal, shortly spicate, 1.5-2.5 cm, 1-1.5 cm in diameter; bracts ovate, 3-4 mm, membranous, apex acuminate, each 2-3-flowered. Pedicel 4-5 mm, slender. Perianth pinkish or white, 5-parted; tepals elliptic, 2.5-3 mm. Stamens 8, exserted; anthers black-purple. Styles 3, connate at base; stigmas capitate. Achenes included in persistent perianth, yellow-brown, shiny, ovoid, trigonous, 2.5-3 mm.

Polygonum macrophyllum var. macrophyllum is close relative of Polygonum macrophyllum var. stenophyllum, but differs from the latter in its basal leaves oblong or lanceolate, 10-30 mm wide (vs. linear-lanceolate, 2-5 mm wide).
Flowering from July to August; fruiting from August to September.
Polygonum macrophyllum is occurring in Guizhou, Hubei, Shaanxi, Sichuan, Xizang, Yunnan of China, Bhutan, N India, Nepal, Sikkim.
Growing in grassy slopes, alpine meadows; 2300-5000 m.
Rights holder(s): Wen, Jun
(From Plants of Tibet )
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Polygonum macrophyllum D.Don from Uttarakhand: Aug2014_DSR_11 : 6 posts by 4 authors. Attachments (1).
This rainy season Polygonum macrophyllum D.Don is common in alpine meadows of Uttarakhand.
Shot in Khalya alpine meadow, Pithoragarh (Uttarakhand).

Wow, beautiful. Thanks … for sharing all yr unique finds..


Thanks … Could you show some leaves. These two pictures on the net are contradictory. May be I have some in my database.
http://www.planta.cn/polygonum_macrophyllum.jpg
http://www.imageflora.com/polygonum-macrophyllum


I could not shot the plant with leaves, it was raining heavily.
However, attaching picture of a herbarium sheet showing leaves. Herbarium specimen is from Garhwal region of Uttarakhand. Attachments(1).
I still remember one of your picture resembling to P.macrophyllum. It was shot around Chopta in the same visit when you photographed Kashmiria himalaica (Scrophulariaceae). Though it was a small individual with just emerging inflorescence.


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Bistorta macrophylla (D. Don) Sojak is a common rainy season perennial herb in subalpine and alpine zones of Uttarakhand. Large, dense populations of this species colour the meadows red.
Photographs reproduced from optical photos taken by me nearly two decades ago.

Interesting upload … I am yet to see this beauty..



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Please validate .
Date: 23-25 Aug, 2014
Location: Dolakha,  Nepal
Altitude : 8000 to 12000  ft.at different locations.

Beautiful pictures!
To me it resembles to B. macrophylla.


I also agree with … comments


Further ID  validation request.
Bistorta vivipara (L.) S.F.Gray
Same location as above.
Attachments (3)

In view of … comments, these may also be of Bistorta macrophylla


Pl. see http://www.efloras.org/object_page.aspx?object_id=50695&flora_id=2
May be … can guide us better for differences between the two species: Bistorta vivipara & Bistorta macrophylla


I will go with … ID.
As per flora of China, one of the major differences between B. vivipara and B. macrophylla is the presence of bulbills in the lower parts of the inflorescence in P. vivipara.
I cannot see any bulbil in the posted images. The compact inflorescence type also matches well with B. macrophylla.
Therefore, I am more convinced with B. macrophylla (D.Don) Sojak

In view of … comments, these may also be of Bistorta macrophylla


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Fwd: Polygonum macrophyllum (Polygonaceae) from Uttarakhand: Aug_2015_DSR_18 : 1 post by 1 author. Attachments (2)
Polygonum macrophyllum D.Don (Polygonaceae) photographed in Khalya alpine meadow, Munsyari, Uttarakhand.
This time I remembered to shoot it with leaves. For the size of plant leaves are really large.



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Polygonaceae : Bistorta vivipara (l.) Gray : 2 posts by 2 authors. Attachments (2).

Please validate.
Date: 25 Aug, 2014
Location: Dolakha, Nepal
Altitude : 11000 ft.

Fine picture!
B.vivipara to me.

These may be of B. macrophylla as per comments by … in another thread.



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Bistorta vivipara (L.) S.F.Gray for validation. : 3 posts by 3 authors. Attachments (3).
Further ID  validation request.
Bistorta vivipara (L.) S.F.Gray
Same location as above.


Bistorta vivipara (L.) Delarbre is a synonym of Persicaria vivipara (L.) Ronse Decr., rhizomes of Polygonum viviparum is a commercial crude drug.
Id is doubtful because the flower colour (White) and spike size varying (elongated).

Bulbils in the lower part of spike replacing normal flowers are not visible here. Bulbils are characteristic feature in absence of which difficult to determine it as P.viviparum.
Please check true P.viviparum on the page B.vivipara in eFI.
/species/m—z/po/polygonaceae/bistorta/persicaria-vivipara


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SK 3092 30 October 2021: 5 very high res. images.
Location: Rara, Nepal
Altitude: 2957m.
Date: 20 August 2021
Habit : Wild
Bistorta milletii Lev. ??


What about Bistorta macrophylla ?
How is Bistorta milletii different? Any keys?

I could find the following images of Bistorta milletii
http://www.flowersofindia.CrimsonKnotweed.html
https://garden.org/plants/photo/410791/
I do not know whether these are correct or not.

Flora of China gives some keys as below:

60 (58) Basal leaves basally decurrent along petiole, forming wings or slightly decurrent. (61) including Pmilletii
+ Basal leaves basally not decurrent. (69) including Pmacrophyllum


Keys based on leaves but unfortunately not leaf images since image shot by a friend.

Anyways, enclosing excerpts from FOB.

Based on the altitude given in Flora of Bhutan and flowering time, let us keep it as Bistorta macrophylla


OK


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SK 3160 22 November 2021: 9 very high res. images.
Location:Mugu, Rara, West Nepal
Altitude: 2957m.
Date: 20 August 2021
Habit : Wild
Bistorta macrophylla (D.Don) Soják. ??


Yes, appears close to images at Bistorta macrophylla


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SK 3251 22 December 2021: 2 very high res. images.

Location: Jumla, West Nepal
Altitude: 3000m.
Date: 24 August 2021 
Habit : Wild
Bistorta macrophylla (D. Don) Sojak ??

Yes, appear close to images at Bistorta macrophylla 


 

 


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References:
POWO  Catalogue of Life  GRIN  The Plant List Ver.1.1 (Unresolved)  Tropicos  Flora of China  FOC illustration  Plants of Tibet  Flora of Pakistan  Annotated checklist of Flowering plants of Nepal  India Biodiversity Portal  Wikipedia  Flowers of India

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