Conyza sumatrensis (Retz.) E. Walker, J. Jap. Bot. 46:72. 1971 in view of efi thread;
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Erigeron sumatrensis Retz., Observ. bot. 5:28. 1788 (“1789”) (Syn: (=) Conyza albida Willd. ex Spreng.; (=) Conyza bonariensis var. microcephala (Cabrera) Cabrera; (≡) Conyza sumatrensis (Retz.) E. Walker; (=) Erigeron bonariensis var. microcephala Cabrera) as per GRIN.
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This late flowering species as indicated in the key comes to flower in August and continues to end of September as we found in Chakrata area is much more rebust than C. canadensis, reaching 2 m in height much branched in the upper part, branches and leaves densely hairy, lower leaves oblanceolate, upper linear-lanceolate, heads longer and broader, 4-6 mm across, phyllaries densely hairy with shorter hairs; broader fruiting head and longer pappus. 
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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 (syn. of Erigeron sumatrensis Retz.)
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
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Kindly help Id this plant growing wild at Pune ? Conyza bonariensis 
about 3.5 feet to 4 feet with narrow coarsely toothed basal leaves and slender top leaves. yellow flower heads and I think brownish seeds in the centre surrounded by white hair 
I cannot comment on hair on stem and leaves as this was growing in a compound of a locked bungalow but a cropped picture of the stem I think appears to show stiff hair.

Features match with Conyza bonariensis except the height which is more than 75 cms


This should be Conyza bonariensis only, can grow taller.


As became clear from more photographs uploaded by … in My Trees, it should be C. sumatrensis.


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Conyza sumatrensis (Retz.) Walker, J. Jap. Bot. 46: 72. 1971

syn Erigeron sumatrensis Retz.; Erigeron albida Willd. ex Spreng

This late flowering species as indicated in the key comes to flower in August and continues to end of September as we found in Chakrata area is much more rebust than C. canadensis, reaching 2 m in height much branched in the upper part, branches and leaves densely hairy, lower leaves oblanceolate, upper linear-lanceolate, heads longer and broader, 4-6 mm across, phyllaries densely hairy with shorter hairs; broader fruiting head and longer pappus.



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Asteraceae Week Part I-Radiate heads:- Conyza sumatrensis from Pune –MR01 : Attachments (6).  

1 post by 1 author.

sharing images of Conyza sumatrensis from Pune. This plant finally became tall and fell down.


image 4.jpg under this thread is not of Conyza sumatrensis but Conyza bonariensis. I have posted it by mistake. is it possible to delete it from the thread?



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Asteraceae : Wild Plant For ID : 180613 : AK-2 : Attachments (2).

Picture taken on the Jammu-Srinagar Highway, on way to Pahalgam on 6/9/2011.

Found this plant growing in a Maize field.

Conyza?


Conyza sumatrensis


This has been identified as Conyza sumatrensis by you.

Both seem to be the same.


I think yes



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Small flowered conyza species: 3. Conyza sumatrensis from Kashmir: Conyza sumatrensis (Retz.) Walker, J. Jap. Bot. 46: 72. 1971

syn Erigeron sumatrensis Retz.; Erigeron albida Willd. ex Spreng

This late flowering species as indicated in the key comes to flower in August and continues to end of September as we found in Chakrata area is much more rebust than C. canadensis, reaching 2 m in height much branched in the upper part, branches and leaves densely hairy, lower leaves oblanceolate, upper linear-lanceolate, heads longer and broader, 4-6 mm across, phyllaries densely hairy with shorter hairs; broader fruiting head and longer pappus.


I am not able to differentiate this picture from Conyza bonariensis. Any clues?


Not to be confused with Conyza bonariensis, but yes often confused with Conyza canadensis. It is a much taller plant often reaching 1.5 m, whereas C. bonariensis does not grow more than 50 cm
I am enclosing all the three together.
This key from eFlora of Taiwan should help
4 (3) Heads ca. 2.5-3.5 mm across, ligules small but apparent. (5)
+ Heads ca. 5-8 mm across, ligules obscure. (6)
5 (4) Stems hirsute; leaves lanceolate, serrate. var. canadensis
+ Stems glabrate; leaves linear, nearly entire. var. pusilla
6 (4) Leaves linear to linear-lanceolate; axillary branches usually overtopping axis. Conyza bonariensis
+ Leaves oblanceolate; axillary branches not overtopping main axis. Conyza sumatrensis

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Correction in Bot. name of Tall Fleabane is required in line with efi page on Erigeron sumatrensis


If we are merging Conyza with Erigeron, there should be no Conyza page.
GRIN and Flora of China merge Conyza in Erigeron

The Plant List, Tropicos and Global Compositae List Treat them distinct and I would prefer following them


Thanks, …, for pointing out this very important aspect.

Further author citation is not correct at Tall Fleabane (FOI)



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Wild Flowers for ID : Kashmir : 111011 : AK-2: Wild flowers taken on the way to Gulmarg, at the viewpoint during the climb up the mountain on the 11th of Sept,11.

Some Asteraceae?


Some Conyza may be.


I also have this photograph, not able to place yet but could be Brachyactis robusta


Finally identified as Conyza japonica


Looks some conyza sp. Send pics of flower heads, these are fruiting heads.


When the picture was taken in Sept,2011, the flowering was probably over.


Then it could be Conyza sumatrensis

Conyza sumatrensis? ABJUL01/30 : 4 posts by 3 authors. 4 images.

These tall leafy shrubs are growing everywhere and sprouting flower-heads now. Could these be Conyza sumatrensis?

Mcleodganj, Dharamshala, HP
1750m

20 July 2016.


Yes …, 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.

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



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Conyza sp. ABJUL01/34 : 4 posts by 2 authors. 2 images.
This plant was about 40cm tall and was only one of the two growing in that rainwater drain. Which Conyza species could this be? I do not have more detailed photos as I had to practically lie down to take this photo. But if required I can collect a leaf and a flowerhead and have a closer look.
Mcleodganj, Dharamshala, HP
1750m

22 July 2016.


I think appear closer to Conyza sumatrensis (Retz.) E. Walker as per comparative images at Conyza



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Wild Plant For ID : Bangalore : 05FEB17 : AK-7 : 14 posts by 3 authors. Attachments (2)

Wild plant seen in Bangalore in the first week of Jan.

It was around 3 feet high.

I think Asteraceae member. 


Please check it for Erigeron (=Conyza) bonariensis.


To me it looks different from images at Conyza bonariensis

Pl. also check with comparative images at Blumea


I think more closer to images at Conyza sumatrensis (Retz.) E. Walker


It looks like Conyza canadensis a roadside weed in many cities.


In the absence of photographs of  the fully opened flowers it is difficult to arrive at a decision by me.


I rechecked again, all posts in efi on Conyza canadensis are from Himalayas. Keys are also provided here. I still feel it is more closer to Conyza sumatrensis. May I request … to have a re-look pl.


May be, when all the details, and description is insufficient there is a chance for mis identification between closely related species. I am not above that.


Thanks … for all the help in identifying this plant.. Will try to get more pictures when I revisit the place.



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SK493 01 MAY-2017:ID : 6 posts by 3 authors. Attachments (6)
Location: Soureni, Mirik, India
Date: 21 April 2017
Altitude: 4200 ft.

Conyza? Pl.  Check the spelling.


Please compare with Conyza sumatrensis in efi.


Erigeron canadensis L. (accepted name) ?? Conyza canadensis (L.) Cronq. (synonym)


Erigeron sumatrensis Retz. (accepted name) Conyza sumatrensis (Retz.) E.H. Walker (synonym)



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Plant ID from Bangladesh SM145 : 5 posts by 3 authors. Attachments(2).
Habit:Herb
Habitat: Wild
Location: Bandarban
Flowering: June


I hope it is Conyza sp., may be Conyza bonariensis (L.) Cronquist.


efi page on Conyza bonariensis


I did not find distribution in Bangladesh !


I hope Conysa sumatrensis


I thought it’s …


Yes for me too!


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Erigeron canadensis L.: 7 very high res. images.
Location: Central Nepal
Altitude: 1400 m.
Date : 02 Mayl 2021
Habitat : Wild
Syn : Conyza canadensis (L.) Cronquist


I guess this should be Erigeron bonariensis L. Syn : Conyza bonariensis (L.) Cronquist !


Conyza sumatrensis (Retz.) E. Walker as per details and keys herein and as per comparative images at Conyza


Thank you … for correct ID !

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I had attached images (1 to 8) in my earlier post where I thought them as Conyza bonariensis. Fortunetly I got hints from … about C. sumatrensis. Then I searched other specimen grown in different places of the same region and collected them (Image No. 11 – 13). I then dissect the reproductive parts of the the specimen and got the following characters. So please ID the Conyza sp. whether it is C. bonariensis or sumatrensis. 

Date :10.04..2013 (Images no – 08) & 30.05.13 (Images no. 11-13)

Location: Kamrup district

Family : Asteraceae

Genus & species : C. bonariensis or sumatrensis. (?)

Habitat: Grows wild.

Habit : Herb, more than 5 feet (more than 150 cm Image No. 11)

Inflorescence : Radiate head .6cm (length) & 0.3-0.4 cm (w); bract two serriate, hairy, no long hair at the apex of the bract.

Flower : Disc floret few, . 6 cm.; pappus . 4 cm; corolla .5cm, 5 lobed, yellow

Ray florets(ligulate) many, .5 cm, ligule not distinct; corolla .4 cm.


I had seen all three growing in Kashmir and found some interesting facts.
Conyza bonariensis is the earliest to flower in May, continuing into june, has more spreading habit, longer and broader leaves and few larger and nearly ovoid to somewhat broader-based heads narrowing towards top, with no visible rays.
C. candensis flowers mostly in June, the plants are erect, delicate, linear with much smaller nearly cylindrical heads with distinct ray florets. the plants are barely taller than 1 m.
C. sumatrensis (syn: C. albida) is a much taller and robust plant often reaching 2 m ot more, much more robust, with heads almost as long as C. bonariensis, but more cyllindrical, without evident ray florets. The leaves are broader like C. bonariensis, but perhaps more broader if we take L vs B ratio into consideration. The plant becomes prominent August onwards and flowers in August to October in Kashmir and Chakrata where I saw it.


I think C. sumatrensis


I guess this should be Erigeron bonariensis L. Syn : Conyza bonariensis (L.) Cronquist !


I agree with … for Conyza sumatrensis (Retz.) E. Walker rather than those at Conyza bonariensis (L.) Cronquist



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References:

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