Earlier it was kept at Rheum australe
<https://efloraofindia.com/2011/03/26/rheum-australe-1/> as per your
earlier post: Polygonaceae Fortnight: Rheum sp from Uttarakhand for
Identification -GSMAY65
<https://groups.google.com/forum/#!topic/indiantreepix/7Uy_0jx4TZQ>
I am also confused as the keys do not give a clear idea.
Flora of Pakistan
<http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=128294> gives
the following keys:
4 (3)
<http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=128294#KEY-1-3>
Flowers
white-pink or pale yellowish. Basal leaf blade up to 50 cm long but never
exceeding; upper surface glabrous or papillose.   (5)
<http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=128294#KEY-1-5>
+ Flowers dark purple. Basal leaf blade up to 60 cm long; upper surface
somewhat scabrous above.   1 R. australe
<http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=242100141>

5 (4)
<http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=128294#KEY-1-4>
Fruits
13-15 mm across. Flowers white to pink.   6 R. wittrockii
<http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=242100147>
+ Fruits 8-10 mm across. Flowers pale yellowish.   5 R. webbianum
<http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=242100146>
Flora of China
<http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=128294> gives
the following keys:
30 (29)
<http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=128294#KEY-1-29>
Leaves
with 5-7 basal veins; leaf blade narrowly triangular to broadly ovate, not
cordate.   (31)
<http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=128294#KEY-1-31>
+ Leaves with 5 basal veins; leaf blade cordate or broadly ovate.   (32)
<http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=128294#KEY-1-32>

31 (30)
<http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=128294#KEY-1-30>
Perianth
white-green or yellow-white; rachis of panicle papilliferous.   1 *R*.
*rhabarbarum*
<http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=242343402>
+ Perianth purple-red; rachis of panicle densely pubescent.   2 *R*.
*australe*
<http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=242100141>

32 (30)
<http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=128294#KEY-1-30>
Leaf
blade reniform-cordate or cordate, usually shorter than wide; perianth
yellow-white.   3 *R*. *webbianum*
<http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=242100146>
+ Leaf blade ovate-cordate or broadly ovate, usually longer than wide;
perianth green.   4 *R*. *hotaoense*
<http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=242343381>

Based on the above, it should be *Rheum webbianum*.


On Sat, 8 Jan 2022 at 21:33, Gurcharan Singh <[email protected]> wrote:

> Rheum webbianum photographed from Medical Plants Nursery, Pothibasa,
> Uttarakhand, 31-5-2013.
>
>
>
>
> Dr. Gurcharan Singh
> Retired  Associate Professor
> SGTB Khalsa College, University of Delhi, Delhi-110007
> Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
> https://www.gurcharanfamily.com/
>
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-- 
With regards,
J.M.Garg

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