Thank you Dr Singh for explaining this. I think I photographed a C. canadensis 
yesterday and will file it in a separate thread for your advice.

Warm regards,
Ashwini

> On 22 Jul 2016, at 10:44, Gurcharan Singh <[email protected]> wrote:
> 
> Yes Ashwini ji, often confused and identified as taller form of C. canadensis.
> I don't know about your area but in Kashmir valley C. canadensis generally 
> flowers in May June, whereas C. sumatransis commences flowering towards 
> middle of July and continues up to September. Heads are shaped somewhat like 
> C. canadensis but longer. 
> 
> Dr. Gurcharan Singh
> Retired  Associate Professor
> SGTB Khalsa College, University of Delhi, Delhi-110007
> Res: 932 Anand Kunj, Vikas Puri, New Delhi-110018.
> Phone: 011-25518297  Mob: 9810359089
> http://www.gurcharanfamily.com/ <http://www.gurcharanfamily.com/> 
> http://people.du.ac.in/~singhg45/ <http://people.du.ac.in/~singhg45/> 
> 
> On Thu, Jul 21, 2016 at 10:05 PM, J.M. Garg <[email protected] 
> <mailto:[email protected]>> wrote:
> Wonderful details, Ashwini ji.
> 
> On 22 July 2016 at 08:44, Ashwini Bhatia <[email protected] 
> <mailto:[email protected]>> wrote:
> These tall leafy shrubs are growing everywhere and sprouting flower-heads 
> now. Could these be Conyza sumatrensis?
> 
> 
> Mcleodganj, Dharamshala, HP
> 1750m
> 20 July 2016.
> 
> Thanks.
> Ashwini
> 
> <_MG_6559_20July2016.jpg><_MG_6572_20July2016.jpg><_MG_6573_20July2016.jpg><_MG_6585_20July2016.jpg>
> 
> 
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