Persicaria pulchra (Bl.) Sojak, Preslia 46: 154 1974. (syn: Persicaria attenuata subsp. pulchra (Soják) K.L.Wilson; Polygonum pulchrum Blume);
India to SE. China and W. & Central Malesia: Andaman Is., Assam, Cambodia, China Southeast, India, Jawa, Laos, Malaya, Myanmar, Philippines, Sri Lanka, Taiwan, Thailand, Vietnam as per POWO;
Persicaria sp. from Hooghly 10/10/12 sk: 8 images.
Attaching images of Persicaria sp.
Place : Garalgacha (Hooghly)
Very nice and clear pictures … Not aware of the species. Clearly a Polygonaceae member. I can see the ocrea. On checking the BSI Flora with me I found that two more characters might be useful for ID as per the key.
Nuts which need to be trigonous and the leaves (Which are acute and attenuate at base) which turn brown on drying and not green in P. barbata.
According to your keys this species is not P. barbata, because i think the leaf in DSCN3615.jpg does not have attenuate base.
I think this can be Persicaria stagnina (Buch.-Ham. ex Meisn.) Qaiser. Very close to P. barbata but differs in having silky strigose leaves.
I further admit that You have introduced me to this genus for the first time, sometimes in 1st quarter, this year.
Firstly thanks for sending me the literature of Bengal plants. I think your doubts are genuine. May I request you to check (if possible) the nuts of the plant? If they are biconvex, it would be P. pulchra (Blume) Sojak, if trigonus, P. stagnina should be correct.
I am very grateful to you for taking so much of your time that you must have spent going through those literatures.
Thanks for your efforts. Though the pictures are not clear.. but I guess the nuts to be trigonus. In that case your plant should be P. stagnina.
Yes, the pictures are very hazy, my camera fails to capture minute objects. Yet the nuts seems to be trigonus and the plant is Persicaria stagnina.
I am sorry to say that this plant can not be P. stagnina, for the ovary of this plant is not trigonous and with 3 long styles.
But it may not be P. pulchra either, for the nutlet is much smaller than 3-4mm.
May I ask you to please wait for some more time and let the seeds get matured. Style characters are important but the seed size may vary a little.
This Persicaria species might be Persicaria lanigera (R. Br.) Sojak, as in – http://flora.huji.ac.il/browse.asp?action=specie&specie=PERLAN.
Seems you are very close but shouldn’t the ochrea be glabrous if it is P. lanigera ? Requesting you to please match your photos again with the link you have provided. Another literature (Preslia 46(2): 153. 1974) treats P. lanigera as a synonym of P. lapathifolia var. lanata (Roxb.) Sojak. …..and P. lapathifolia are known to possess glabrous ochrea without bristles at apex, 2-style and broadly ovoid biconcave nuts.
Second, i missed the “glabrous ochrea” this morning, though i certainly noticed that The Plant List equates 1) Polygonum lanigerum R.Br. with Persicaria lanigera (R.Br.) Soják and 2) Polygonum lanatum Roxb. with Polygonum lapathifolium var. lanatum (Roxb.) Steward.
I visited this plant again today, they are still flowering profusely, recorded more pictures today, except nuts.
Agree with you …
Now we have only two option left. Waiting to see the mature nuts one more time so that we can reach to a conclusion.
Thank you very much …, i will try to find its nuts again.
References: POWO Catalogue of Life The Plant List Ver.1.1 IPNI GBIF (High resolution specimens) BSI Flora of India Checklist Flora of China Flora of peninsular India Kerala plants Wikimedia Commons Plant illustrations Plazi Flickr Taieol An Excursion Flora of Central Tamilnadu, India By K. M. Matthew