Rheum webbianum from Pothibasa, Uttarakhand-GS08012022-2

[Gurcharan Singh]

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/

[Gurcharan Singh]

Another image

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/

[Gurcharan Singh]

Another image

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/

[J.M. Garg]

Earlier it was kept at Rheum australe as per your earlier post: Polygonaceae Fortnight: Rheum sp from Uttarakhand for Identification -GSMAY65

I am also confused as the keys do not give a clear idea.

Flora of Pakistan gives the following keys:

4 (3)	Flowers white-pink or pale yellowish. Basal leaf blade up to 50 cm long but never exceeding; upper surface glabrous or papillose.		(5)
+	Flowers dark purple. Basal leaf blade up to 60 cm long; upper surface somewhat scabrous above.		1 R. australe
5 (4)	Fruits 13-15 mm across. Flowers white to pink.		6 R. wittrockii
+	Fruits 8-10 mm across. Flowers pale yellowish.		5 R. webbianum

Flora of China gives the following keys:

30 (29)	Leaves with 5-7 basal veins; leaf blade narrowly triangular to broadly ovate, not cordate.		(31)
+	Leaves with 5 basal veins; leaf blade cordate or broadly ovate.		(32)
31 (30)	Perianth white-green or yellow-white; rachis of panicle papilliferous.		1 R. rhabarbarum
+	Perianth purple-red; rachis of panicle densely pubescent.		2 R. australe
32 (30)	Leaf blade reniform-cordate or cordate, usually shorter than wide; perianth yellow-white.		3 R. webbianum
+	Leaf blade ovate-cordate or broadly ovate, usually longer than wide; perianth green.		4 R. hotaoense

Based on the above, it should be Rheum webbianum.

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With regards,
J.M.Garg

[Gurcharan Singh]

Yes Garg ji, my that post was a mix of two species, first two actually belonging to R. webbianum clicked between 14:54 and 14:55, third image with purple-red flowers clicked at 14:55 to 14:58. R. australe in high resolution I will upload separately.

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/

[Gurcharan Singh]

Here are focussed distinctly cordate leaves of image 2032

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/

[J.M. Garg]

I think keys with regard to base of the leaf given in Flora of China may not be correct as Flora of China itself says leaf blade ovate-elliptic or broadly ovate, large, 20-50 × 18-40 cm, abaxially pilose, basal veins 5-7, base cordate, margin entire, sinuolate, apex obtuse. Also Flora of Pakistan supports it. 

This is also clearly evident from our images at Rheum australe.

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With regards,
J.M.Garg

[J.M. Garg]

I have doubts about the id after going through your images from Kashmir as the fruit perianth colour is whitish (although nothing has been mentioned about it in the efloras) and not purple red/ red (as mentioned in Flora of Pakistan and Flora of China) at 
Rheum webbianum from Kashmir
Polygonaceae Fortnight: Rumex webbianum from Kashmir-GSMAY61 

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With regards,
J.M.Garg

[Shakir Ahmad (Amateur Taxonomist)]

Identified by Abid munshi sir it with R.emodi.

Much resembles with R.webbianum

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