Conyza canadensis

 
Annual herb, 50 cm to 2 m tall, branched mostly in upper part; leaves oblanceolate to linear, ciliolate along margin and hispid on nerves; heads small, 3-4 mm across, in branched panicles; ray florets white, disc florets yellow; phyllaries glabrous to strigose.

The plant can be easily differentiated from related C. bonariensis by its strict habit, numerous small heads and distinct white ray florets.  

1a. Plants usually shorter than 50 cm; lateral branches equalling or overtopping main axis; heads 5-8 mm across; ray corolla shorter than 0.3 mm; fruiting head 8-10 mm across, pappus 3-4 mm long; lower leaves
linear-lanceolate, upper linear........................................................................................Conyza bonariensis
1b. Plants usually taller than 50 cm; lateral branches shorter than main axis; heads less than 6 mm across;
lower leaves lanceolate or oblanceolate, upper linear-lanceolate..................................... (2)
2a. Ray corolla shorter than 0.3 mm; heads 4-6 mm across; fruiting head 7-8 mm across, pappus 3-4 mm
long; lower leaves oblanceolate, upper linear-lanceolate; plants densely hairy, phyllaries short
hairy...............................................................................................................................Conyza sumatrensis
2b. Ray corolla 0.3-1 mm long; heads 2-4 mm across; fruiting head 5-6 mm across, pappus 2-3 mm long;
leaves lanceolate; plants sparsely hairy; phyllaries with few long hairs............................Conyza canadensis    
 

https://groups.google.com/group/indiantreepix/attach/58f3699b921f233e/Conyza-canadensis-Botanical%20garden-Kashmir-1.jpg?part=0.3&authuser=0&view=1
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https://groups.google.com/group/indiantreepix/attach/58f3699b921f233e/Conyza-canadensis-Balgarden-Kashmir-2.jpg?part=0.1&authuser=0&view=1
 
Conyza canadensis from Kashmir:  Conyza canadensis (L.) Cronquist, Bull. Torrey Bot. Club 70:632. 1943
syn: Erigeron canadensis L.
Common names: butterweed, Canadian horseweed, Canadian-fleabane, hogweed, horseweed
Annual herb, 50 cm to 2 m tall, branched mostly in upper part; leaves oblanceolate to linear, ciliolate along margin and hispid on nerves; heads small, 3-4 mm across, in branched panicles; ray florets white, disc florets yellow; phyllaries glabrous to strigose.
The plant can be easily differentiated from related C. bonariensis by its strict habit, numerous small heads and distinct white ray florets.
Photographed from Balgarden Srinagar and Botanical Garden below Cheshmashahi, both in Kashmir


Asteraceae Fortnight Part 1-Radiate heads:: Conyza canadensis from Kashmir-GS9 :  Attachments (3).  2 posts by 2 authors.  
Conyza canadensis (L.) Cronquist, Bull. Torrey Bot. Club 70:632. 1943 syn: Erigeron canadensis L.
Common names: butterweed, Canadian horseweed, Canadian-fleabane, hogweed, horseweed
Annual herb, 50 cm to 2 m tall, branched mostly in upper part; leaves oblanceolate to linear, ciliolate along margin and hispid on nerves; heads small, 3-4 mm across, in branched panicles; ray florets white, disc florets yellow; phyllaries glabrous to strigose.
The plant can be easily differentiated from related C. bonariensis by its strict habit, numerous small heads and distinct white ray florets.
Photographed from Balgarden Srinagar and Botanical Garden below Cheshmashahi, both in Kashmir.


 
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26072011-BS-001 A wild herb for id from Samalkha Panipat:   Pls ID this wild herb about 4 ft high.
Looks asteraceae member
shot from unattended area of Bel pattar Herbal Garden Samalkha Panipat
no flowers fruits seen
Shot on 28-6-11

It appears to be Conyza bonariensis 

Without flower, hmmm it is difficult, I guess. Anyway it is a species of Conyza.
Was the plant covered by stiff hairs?
Is there any difference in the leaves at the base of the stem?
Let us wait to hear from ....

I would comment only after seeing it flower. Species of Conyza are often deceptive in vegetative condition. There are similar plants here also in Kashmir. I am waiting for them to flower.
Yes I have seen it flowering it a lot in August and September in Kashmir, Jammu and along National highway 1. It is Conyza canadensis. C. bonariensis is a much shorler plant, narrow leaves and flowering earlier.

 
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https://08511630493324166816.googlegroups.com/attach/2801f3fc231fe6ca/Conyza%20canadensis%20(3).JPG?part=0.3&view=1&vt=ANaJVrHvrIgvqfiVxh1fY32h01Y-shhoBD20xyVvnGk_IxYa7eSuDQsubd__vfM1qATHPm0nuULTCm9ZeQrynUolv1U5X1R9D8MbLuXcgmSIocDmE3zQbP8
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Flora of Chakrata: Conyza canadensis from Herbal Garden Deovan ChakrataConyza canadensis from Herbal Garden Deovan Chakrata
Thanks to ... Sir for briefing us about different sp of Conyza during this Tour
 
 
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https://08511630493324166816.googlegroups.com/attach/341e3e623133c506/Conyza-canadensis-Balgarden-Kashmir-4.jpg?part=0.3&view=1&vt=ANaJVrGRjQWhRE-p9FN3QWNAnz56kNzH2wdfe064aGrUD4tmDUOcgAdKx1dcprKkUFgL5bJULIL5xru5xtEM_L9_fS9x_WqsyXhTNDDiLvmgSeL5KVHMF7M
Small flowered conyza species: 1. Conyza canadensis from Kashmir: Conyza canadensis (L.) Cronq., Bull. Torrey Bot. Club. 70: 632. 1943
syn: Erigeron canadensis L.
Photographed from Srinagar Kashmir. Notice slender habit, taller plants and smaller heads. Details already given in the key.


 
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VOF Week: Asteraceae sp-6 from Joshimath:  This is one more herb of Asteraceae looking some what similar to Conyza bonariensis ...
Location: Joshimath.
I hope Conyza canadensis
Pl. note smaller almost cylindrical heads and larger ray florets.
 
 
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https://08511630493324166816.googlegroups.com/attach/49beca47fcfa3994/IMG_2121.jpg?part=0.2&view=1&vt=ANaJVrHMuntPEQ1BSQLBZTBD-A0GJjPeXE3CVZy_QfgW0-xghuFbXgu2clyvfSgEr8WHvJSAFVkb-CZDLJBuy3q_yW298diE-x0Hvl-gnv83qK3AwY0sAQw
Conyza canadensis from Joshimath.

This was shot from some locations in Chakrata and VOF Route.. I hope they all belong to Conyza canadensis.. please help to id..
Yes ... Nice photographs.
 
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PM 2 29-09-2017 Asteraceae member id from chandigarh : 3 posts by 2 authors. Attachments (6)
Habit- small herb
leaves- small, linear to lanceolate present in tuft of 5-6 all along the stem
Inflorescenece-  axillary cyme 
Habitat- wild 
Locality- Chandigarh
Date- 22-09-2017
Erigeron canadensis... 

 
 
 
References:
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