Asteraceae Fortnight Part I-Radiate heads: Conyza sp. from Kamrup district, Assam- KD 05

[Karuna Das]

Dear All,

    I had attached images(1 to 8) in my earlier post where I thought  them as Conyza bonariensis. Fortunetly I got hints from Gurcharan Sir Ji  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.

With regards

Karuna Kanta Das

Guwahati 781012

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[Gurcharan Singh]

Karuna ji

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.

-- 

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://people.du.ac.in/~singhg45/ 

 

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[J.M. Garg]

Forwarding again for Id confirmation or otherwise please.

Some earlier relevant feedback:      

Karuna ji 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. -- Dr. Gurcharan Singh

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J.M.Garg

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[J.M. Garg]

Forwarding again for Id confirmation or otherwise please.

Some earlier relevant feedback:

Karuna ji 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. -- Dr. Gurcharan Singh

efi pages: Conyza bonariensis & Conyza sumatrensis

---------- Forwarded message ----------
From: Karuna Das <kd_...@rediffmail.com>
Date: 1 May 2013 19:26
Subject: [efloraofindia:153390] Asteraceae Fortnight Part I-Radiate heads: Conyza sp. from Kamrup district, Assam- KD 05
To: indiantreepix <indian...@googlegroups.com>
Cc: kd_dkc <kd_...@rediffmail.com>

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[Gurcharan Singh]

Forwarding for ID

Distributed as Conyza species- Kamrup district, Assam

I think C, sumatrensis

Group discussion at

Asteraceae Fortnight Part I-Radiate heads: Conyza sp. from Kamrup district, Assam- KD 05 (google.com)

[Gurcharan Singh]

Forwarding for ID

Distributed as Conyza species- Kamrup district, Assam

I think C, sumatrensis

Group discussion at

Asteraceae Fortnight Part I-Radiate heads: Conyza sp. from Kamrup district, Assam- KD 05 (google.com)

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From: kd_...@rediffmail.com <kd_...@rediffmail.com>
Date: Wednesday, May 1, 2013 at 7:26:12 PM UTC+5:30
Subject: Asteraceae Fortnight Part I-Radiate heads: Conyza sp. from Kamrup district, Assam- KD 05
To: indiantreepix <indian...@googlegroups.com>

Cc: kd_...@rediffmail.com <kd_...@rediffmail.com>

[Saroj Kasaju]

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

Thank you.

Saroj Kasaju

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[J.M. Garg]

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

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With regards,
J.M.Garg