Persicaria posumbu (Buch.-Ham. ex D. Don) H. Gross ?;

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Persicaria hydropiper (L.) Delarbre (?) from Kamrup district, Assam:

Attaching images of what looks like Persicaria hydropiper (L.) Delarbre. Please confirm the ID.
Date :21.12.2012
Location: Kamrup district, Assam
Family : Polygonaceae
Genus & species : Persicaria hydropiper (L.) Delarbre (?)
Habitat: Grows wild on bank of the stream
Habit : Herb
Flower : Small, pink in colour

Not P. hydropiper. Please check for Persicaria posumbu Buch.-Ham. ex D.Don.


Found the following websites on P. posumbu
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Attached images may be Polygonum posumbu Buch.-Ham. ex D. Don. collected from Assam. Please ID the plant sp.  


I would appreciate if … uploads ochrea photographs too. The plant looks close to P. posumbu and P. longiseta but I am not sure. Even the nut characters are important.


Persicaria longiseta (Bruijn) Kitag. ??.


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Persicaria prosumbu : 4 posts by 3 authors. Attachments (5)
I guess the plant is Pesicaria prosumbu. Please verify.

Shot at Mudkhu on 10 August 2016 at 5000 ft.


Difficult for me to guess with these pictures. P. longisetum and P. hydropiper are also closely allied to P. posumbu. If possible, plz check the perianth, seeds and cilia of the ochrea (which should be 6-8mm). I am providing a key (Adopted from Fl. China) for your convenience:
1. Perianth punctate…………………..P. hydropiper
1. Perianth not punctate………………………………2

2. Leaves ovate-lanceolate or ovate, apex caudate-acuminate, base broadly cuneate………………..P. posumbu
2. Leaves lanceolate or broadly lanceolate, apex acute or acuminate, base cuneate or rounded…..P. longiseta.

Hope this helps.


Persicaria caespitosa (Blume) Nakai  ??


 

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