Deutzia corymbosa from between Renuka ji and Bhangayan temple Himachal Pradesh-GS26022020-1

[Gurcharan Singh]

Deutzia corymbosa R.Br.

The plant seems to be matching well with this species, but is not featured on our database, nor on Flowers of India, nor eFlora of India. The name is considered accepted according to TPL, World Flora Online and Kew Database. Catalogue of Life considers it  ambiguous synonym  for Deutzia hookeriana (Schneid.) Airy Shaw  

Clicked from Near Renukaji on way to Renuka ji and Bhangayan temple, Himachal Pradesh, May 24, 2015.

Dr. Gurcharan Singh

Retired  Associate Professor
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Mob: 9810359089

https://sing96.wixsite.com/mysite-1

[J.M. Garg]

Thanks, Singh ji.

To me appears similar to images at Deutzia staminea

Flora of Pakistan only mentions this species with distribution as N.W. Himalayas, Kashmir, Nepal & N. China along with Deutzia scabra Thunb.

Checklist of Nepal mentions this with distribution as Himalaya (Kashmir to Bhutan) along with Deutzia bhutanensis Zaik. (E. Himalaya (Nepal to Bhutan)) and Deutzia compacta Craib (syn: Deutzia corymbosa var. hookeriana C. K. Schneid.) and distribution as Himalaya (Nepal to Bhutan), N. Assam, S. Tibet, N. Burma, W. China.

Our plants, I think closer to Deutzia staminea as per comparative illustrations from Flora of China:

http://www.efloras.org/object_page.aspx?object_id=12463&flora_id=2

http://www.efloras.org/object_page.aspx?object_id=12445&flora_id=2

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With regards,
J.M.Garg

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[Gurcharan Singh]

Garg ji

Leaves are grey-tomentose underneath in D. staminea, green here. 

Dr. Gurcharan Singh

Retired  Associate Professor
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Mob: 9810359089

https://sing96.wixsite.com/mysite-1

[Gurcharan Singh]

Moreover leaves are never more than 4.5 cm long in D. staminea, here they are much longer.

Dr. Gurcharan Singh

Retired  Associate Professor
SGTB Khalsa College, University of Delhi, Delhi-110007
Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
Mob: 9810359089

https://sing96.wixsite.com/mysite-1

[J.M. Garg]

Thanks, Singh ji.

Calyx is quite different between the two as per comparative illustrations from Flora of China:

http://www.efloras.org/object_page.aspx?object_id=12463&flora_id=2

http://www.efloras.org/object_page.aspx?object_id=12445&flora_id=2

Pl. show it clearly. Matter will be decided accordingly.

[Gurcharan Singh]

Here are more high resolution images to help in deciding

[Gurcharan Singh]

one more 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/

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[Gurcharan Singh]

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]

Garg ji 

Please note that D. corymbosa and D. hookeriana (which POWO treats as synonym of D. compacta; eFlora of China treats them distinct) although similar in larger leaves (2-5 inches), long acuminate leaves differ in leaves being almost glabrous beneath in D. corymbosa and densely stellate in D. hookeriana. Also former is distributed in W. Himalayas, latter in Eastern Himalayas.

     In D. staminea leaves are rarely longer than 2 inches, unequally toothed, apex obtuse to subacute and underside greyish densely covered with stellate hairs.  Here is good account of genus:

Deutzia corymbosa - Trees and Shrubs Online

 

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/

[Mahadeswara]

Dear Gurucharan ji / Garg ji,

Which is it's  correct family name : Philadelphiaceae or Saxifragaceae ?

Thanks & Regards,

[Gurcharan Singh]

Mahadeswara ji, according to the latest classification APG IV (2016), it is under Hydrangeaceae ( 9 genera incl. Deutzia, Philadelphus, Hydrangea, Dichroa, Fendlera etc.) whereas  rest of 33 genera are under Saxifragaceae. 

This classification if followed in both my books 

International Edition: Plant Systematics An Integrated Approach (Taylor and Francis, 2019)

Indian Edition: Plant Systematics Theory and Practice (Oxford & IBH now under CBS Publishers, 2021). Latter describes with type studies families taught in Indian Universities at B.Sc. and M.Sc. level.

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/

To view this discussion on the web, visit https://groups.google.com/d/msgid/indiantreepix/b0e57629-3b56-4078-a50f-4b04942a4cd7n%40googlegroups.com.

[Mahadeswara]

Thanks a lot Gurucharn ji for the clarification.

With Regards,