Polygonum? Hooghly 3/3/13 sk

[surajit koley]

Sir,

I found this small prostrate-erect herb on the edge of a narrow drain beside a rural road.

I am sorry for very poor quality photographs, due to want of light.

Species : Unknown

H & H : small prostrate-erect herb; leaves alternate; inflorescence axillary fascicled

Date : 2/3/13

Place : Hooghly

Any chance of Polygonum effusum Meisn.?

Regards,

surajit

[D.S Rawat]

May be Polygonum plebeium R.Br. though P.plebeium in our area has clearly pink flowers.

DSRawat

[surajit koley]

Thank you Sir for the very probable ID.

"Bengal Plants" keys in :- (Inflorescence in axillary clusters)

  (i) Sepals all obtuse, short, broad;  flowers hidden among stipules ------- plebejum

  (ii) Sepals all obtuse, short, broad; flowers all or mostly pedicelled ------ plebejum var. effusa

  (iii) Sepals all obtuse, narrow ------- plebejum var. micranthema

  (iv) Sepals two outer acute; leaves 0.25 in. long or less ------- plebejum var. brevifolia

  (v) Sepals two outer acute; leaves 0.5 in. long or longer ------- plebejum var. elegans

The photographs are so bad that i failed to come to any conclusion.

Thank you once again,

Regards,

surajit

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[Ritesh Kumar Choudhary]

Dear Surajit Ji,

Thanks for this upload. To me too, this looks like a var. of Polygonum plebeium but definitely not P. effusum. I have seen P. effusum in field which has pedicellate flowers exerted from ochrea, obtuse tepals and spatulate leaves. Please check with the detailed description of other varieties of P. plebeium. which you have mentioned above. I will also search for some relevant literature and let you know.

Best regards,

Ritesh. 

[surajit koley]

Ritesh Ji,

Thank you very much for confirming that this is not P. effusum and at the same time suggesting that this could be a var. of P. plebeium.

In the field i missed the flower. Even i didn't think that it could be a Polygonum, because i missed the ochrea too!

Of the varieties described in this thread i am left with two options - 1) P. plebeium var. micranthema and 2) P. plebeium var. elegans.

According to F. B. I. -

(i) var. micranthema : leaves 1/4 to 1/3 in., obtuse; flowers very minute pedicelled crowded in upper axils, pedicel often as long as the perianth......

(ii) var. elegans : leaves 1/2 to 2/3 in., acute or acuminate; flowers sessile or shortly pedicelled.....

According to Flora Indica - leaves of P. elegans are bifarious.

I am not sure if the leaves in this plant can be called bifarious.

So, i need to (1) revisit this plant and get some more clear shots and (2) search if there could be any other variety of P. plebeium, not described in the Bengal Plants.

Thank you once again.

Regards,

surajit

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[J.M. Garg]

Forwarding again for Id confirmation or otherwise please.

Some earlier relevant feedback:      

May be Polygonum plebeium R.Br. though P.plebeium in our area has clearly pink flowers. DSRawat

Thank you Sir for the very probable ID.

"Bengal Plants" keys in :- (Inflorescence in axillary clusters) (i) Sepals all obtuse, short, broad; flowers hidden among stipules ------- plebejum (ii) Sepals all obtuse, short, broad; flowers all or mostly pedicelled ------ plebejum var. effusa (iii) Sepals all obtuse, narrow ------- plebejum var. micranthema (iv) Sepals two outer acute; leaves 0.25 in. long or less ------- plebejum var. brevifolia (v) Sepals two outer acute; leaves 0.5 in. long or longer ------- plebejum var. elegans The photographs are so bad that i failed to come to any conclusion. Thank you once again, Regards, surajit

Thanks for this upload. To me too, this looks like a var. of Polygonum plebeium but definitely not P. effusum. I have seen P. effusum in field which has pedicellate flowers exerted from ochrea, obtuse tepals and spatulate leaves. Please check with the detailed description of other varieties of P. plebeium. which you have mentioned above. I will also search for some relevant literature and let you know. Best regards, Ritesh.
Thank you very much for confirming that this is not P. effusum and at the same time suggesting that this could be a var. of P. plebeium.

In the field i missed the flower. Even i didn't think that it could be a Polygonum, because i missed the ochrea too! Of the varieties described in this thread i am left with two options - 1) P. plebeium var. micranthema and 2) P. plebeium var. elegans. According to F. B. I. - (i) var. micranthema : leaves 1/4 to 1/3 in., obtuse; flowers very minute pedicelled crowded in upper axils, pedicel often as long as the perianth...... (ii) var. elegans : leaves 1/2 to 2/3 in., acute or acuminate; flowers sessile or shortly pedicelled..... According to Flora Indica - leaves of P. elegans are bifarious. I am not sure if the leaves in this plant can be called bifarious.   So, i need to (1) revisit this plant and get some more clear shots and (2) search if there could be any other variety of P. plebeium, not described in the Bengal Plants. Thank you once again. Regards, surajit

eflora of China, eflora of Nepal as well as The Plant List does not mention any of these varieties. - from me.

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[surajit koley]

Thank you Sir for taking care of all posts.

Attaching new set of photographs recorded today. The flowers are so small that better picture using my camera is nearly impossible.

Regards,

surajit

[J.M. Garg]

Another discussion addresses this topic:

You were redirected here from a topic that was marked as a duplicate:

[surajit koley]

Sir,

Could this be Polygonum elegans Roxb. of Flora Indica - http://ia600602.us.archive.org/BookReader/BookReaderImages.php?id=mobot31753000967874&itemPath=%2F35%2Fitems%2Fmobot31753000967874&server=ia600602.us.archive.org&page=n293_w286?

Regards,

surajit