ad-jur-uh-TY-nuh or ad-jur-uh-TEE-nuh — dimunitive of Ageratum genusDave’s Botanary
ad-eh-NO-for-uh — bearing or producing glands; often referring to sticky glandsDave’s Botanary
commonly known as: catweed, crofton weed, eupatory, hemp-agrimony, Mexican devil, sticky eupatorium, sticky snakeroot, white thoroughwort • Hawaiian: maui pamakani, pamakani haole • Malayalam: കമ്മുണിസ്റ്റ പച്ച kammunista pachcha (as E. glandulosum) • Marathi: ओसाडी osadi • Nepalese: बनमारा ban mara, कल झाड़ kal jhar • Thai: สาบหมา saap maa
 
Perennial coarse herb; leaves opposite, ovate-deltoid, up to 10 cm long, 4-7 cm broad with broadly cuneate or truncate base, sparsely pilose on both surfaces, 3-nerved, margins crenate, on 4-5 cm long petiole; Heads white 6-8 mm long, 5-6 mm across, in loose compound corymbs, receptacle glabrous,; achenes black, 1.5 mm long, 5-angular, glabrous; pappus of 8-10 bristles.

Native of Mexico, California and the West Indies, widely naturalised in tropical to subtropical areas.  

It is invasive alien species in India. Noxious in the hills on slopes.
 


Differences:

Ageratina: Phyllaries persistent, 8–30 in 2(–3) series, 0- or 2-nerved, lanceolate to linear, ± equal (herbaceous). Florets 10–60; corollas white or lavender, throats obconic to campanulate (lengths 1.5–2 times diams.); styles: bases sometimes enlarged, glabrous, branches linear, seldom distally dilated.
Chromolaena: Phyllaries usually readily falling (at least in fruit), 18–65+ in 4–6+ series, 3–5-nerved, ovate to oblong or lanceolate, unequal (papery or herbaceous), outer shorter. Florets [6–]15–40[–75]; corollas white or purple to blue, lavender, or reddish, throats cylindric (lengths 3–4 times diams.); styles: bases not enlarged, glabrous, branches linear to linear-clavate.

– …, if you want a shortcut:
Ageratina adenophora ALWAYS occurs in higher altitudes, whereas, Chromolaena odorata is usually found in plains (may be with some exceptions). A.a. has purplish stems and petioles, while C.o. is generally green throughout.
A. adenophora can also be distinguished by its leaves which as triangular (deltoid) in outline with a more or less truncate (straight) base (except subcuneate at petiole).


It is native to Mexico, but it is known in many other parts of the world as an introduced species and often a noxious weed. It has caused great economic loss in agriculture in southwestern China, and is threatening the native biodiversity there. It was first inadvertently introduced to Yunnan around 1940, and its rapid spread is due in part to its allelopathic competition with other plant species.[2] It also a weed in Australia, where it was introduced to Sydney in 1904. It has spread along the coastline of New South Wales and southern Queensland.[1] It is rated a Class 4 Noxious Weed under the NSW Noxious Weeds Act of 1993.

Ageratina adenophora has also spread in Hawaii and the mainland USA, where it is recognised as a weed in ten states of the South and Southwest.[3]

Elsewhere it is an invasive species in many tropical and subtropical countries, including northeastern India, Sri Lanka, Nigeria, Southeast Asia, Australia, New Zealand, the Pacific Islands, the Canary Islands, and South Africa.[3][4][5]

The plant can spread vegetatively, that is the stems can sprout roots and grow upon contact with earth. The seed is also carried by the wind or water and colonises disturbed areas, such as fields and areas near human habitation, readily. Seed may also be transported on animals and in soil.[1]

(From Wikipedia on 9.6.13) 
 

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Ageratina radiophone from Morni hills, Haryana: Ageratina adenophora (Spreng.) R. M. King & H. Rob.,  Phytologia 19:211. 1970
syn: Eupatorium adenophorum Spreng.; Ageratina trapezoidea (Kunth) R. M. King & H. Rob.; Eupatorium glandulosum Michx.; Eupatorium trapezoideum Kunth  
Perennial coarse herb; leaves opposite, ovate-deltoid, up to 10 cm long, 4-7 cm broad with broadly cuneate or truncate base, sparsely pilose on both surfaces, 3-nerved, margins crenate, on 4-5 cm long petiole; Heads white  6-8 mm long, 5-6 mm across, in loose compound corymbs, receptacle glabrous,; achenes black, 1.5 mm long, 5-angular, glabrous; pappus of 8-10 bristles. 
Native of Mexico, California and the West Indies, widely naturalised in tropical to subtropical areas.  
Photographed from Morni hills at about 1200 m on April 9, 2011.
Common names: catweed, Crofton weed, croftonweed, hemp-agrimony, Maui pamakani, Mexican-devil, sticky-agrimony 


–  I have seen both and can say they are miles different. I had seen this plant earlier many times mostly in vegetative condition and always thought it to a be some shrub, with leaves much larger and broader than Chromolaena odorata. The inflorescence is also much different, an erect spreading panicle in Ageratina.
To me they are so different that I never thought the two can be confused.

    These are Chromolaena odorata
    and these Ageratina adenophora
    Ageratina: Phyllaries persistent, 8–30 in 2(–3) series, 0- or 2-nerved, lanceolate to linear, ± equal (herbaceous). Florets 10–60; corollas white or lavender, throats obconic to campanulate (lengths 1.5–2 times diams.); styles: bases sometimes enlarged, glabrous, branches linear, seldom distally dilated.
    Chromolaena: Phyllaries usually readily falling (at least in fruit), 18–65+ in 4–6+ series, 3–5-nerved, ovate to oblong or lanceolate, unequal (papery or herbaceous), outer shorter. Florets [6–]15–40[–75]; corollas white or purple to blue, lavender, or reddish, throats cylindric (lengths 3–4 times diams.); styles: bases not enlarged, glabrous, branches linear to linear-clavate.
– …, if you want a shortcut: 
    Ageratina adenophora ALWAYS occurs in higher altitudes, whereas, Chromolaena odorata is usually found in plains (may be with some exceptions). A.a. has purplish stems and petioles, while C.o. is generally green
throughout.
    A. adenophora can also be distinguished by its leaves which as triangular (deltoid) in outline with a more or less truncate (straight) base (except subcuneate at petiole).
Hope .. agrees with these (somewhat nontechnical differences).


– I had seen this plant many a times, mostly as vegetative plant, and always thought it to be a low shrub.


– Have put comparative pictures in a separate post at efi thread


– This is an earlier discussion where one of my plant got identified as
Ageratina adenophora (Spreng.) R.King & H. Robinson.:
https://groups.google.com/forum/#!searchin/indiantreepix/Eupatorium/i…


– Then also we compared it a lot with Chromolaena odorata, till .. sorted it out as Eupatorium glandulosum: now correctly known as Ageratina adenophora.

    My Chromolaena frustrata from Delhi still remains unresolved.


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Kalatope Dam side id – Al041012:  Another plant from Chamera Dam side…
Location Kalatope, Chamba
Altitude 1200 mts
Habit herb
Habitat wild
Height 12-14 inches
Season March-April


Catweed (Ageratina adenophora)
http://www.flowersofindia.net/catalog/slides/Catweed.html
http://en.wikipedia.org/wiki/Ageratina_adenophora


Yes … is right

It is gradually becoming common in N W Himalayas more recently.


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Ageratina adenophora :  4 images. 2 posts by 2 authors.
ageratina adenophora, mahabaleswar first week of march
it was growing everywhere on the mountain sides
a native of mexico it is now considered a noxious weed everywhere else
putting this up as a response to … earlier mail on invasive species


Ageratina adenophora (=Eupatorium adenophorum) is a noxious weed also in mid altitudes of the Himalaya where it completely covers slopes.


 

 

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Wild Plant For ID : White Flowers : Uttarakhand :180413 : AK-1 : Attachments (1 + 1).  8 posts by 5 authors.
Wild plants seen growing all over in the Jim Corbett area with White flowers. 


Ageratum conyzoides 


Some leaves please to exclude the possibility of Ageratina adenophora


It seems Ageratina adenophora (=Eupatorium adenophorum).


Attaching one more picture with leaves.


Yes, this is Eupatorium adenophorum only


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Asteraceae Fortnight Part 2-Discoid Heads: Ageratina adenophora from Morni Hills- NS 02 : Attachments (7). 3 posts by 3 authors.

This fast spreading weed was shot from various locations in Morni Hills, HaryanaAgeratina adenophora (Spreng.) R.M. King & H. Rob. = Eupatorium adenophorum Spreng. ….. I hope this is correctly identified..


Yes the correct ID.

It is invasive alien species in India. Noxious in the hills on slopes.


Yes … Very common in Western Himalayas, except Kashmir.


 

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ASTERACEAE Fortnight Part 2-Discoid heads: Ageratina adenophora from Uttarakhand_DSR_1: Attachments (2).3 posts by 3 authors.

Ageratina genus in India is represented by four wild or naturalized species (A.adenophora, A.ligustrina, A.riparia and A.trapezoidea ).
One of the most common species A.adenophora (Spreng.) R.M.King & H.Rob. is attached here.
It is a noxious weed in mid hills of the Himalaya. 


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Asteraceae Week (Part II – Discoid heads) :: Ageratina adenophora at Mahabaleshwar :: 17 FEB 08 :: DV03 : 3 images. 2 posts by 2 authors.
Ageratina adenophora (Spreng.) R.M.King & H.Rob.
ad-jur-uh-TY-nuh or ad-jur-uh-TEE-nuh — dimunitive of Ageratum genusDave’s Botanary
ad-eh-NO-for-uh — bearing or producing glands; often referring to sticky glandsDave’s Botanary
commonly known as: catweed, crofton weed, eupatory, hemp-agrimony, Mexican devil, sticky eupatorium, sticky snakeroot, white thoroughwort • Malayalam: കമ്മുണിസ്റ്റ പച്ച kammunista pachcha • Marathi: ओसाडी osadi • Nepalese: बनमारा ban mara, कल झाड़ kal jhar
Native to: central Mexico; widely naturalized
References: Flowers of IndiaGRINPIERWikipediaFurther Flowers of Sahyadri by Shrikant Ingalhalikar
at Mahabaleshwar on 17 FEB 08


 

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Asteraceae Fortnight Part 2-Discoid heads: Ageratina adenophora from Morni, Chakauri and Bhimtal-GS2 : Attachments (6). 1 post by 1 author.

Ageratina adenophora (Spreng.) R. M. King and H. Rob., 1970

Syn: Eupatorium adenophora Spreng.
Very commonly distributed along roadsides in Western Himalayas, a recent introduction.
Photographed from Morni, Bhimtal and Chakauri.


 

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Requesting to please ID this plant captured abundantly growing on the roadside in Ooty in November 2013.


This has been identified by … as Ageratina adenophora here: efi thread


 

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Munnar
Date: June 3 – 6, 2014 … Elevation: around 1600m asl 
¿ Ageratina adenophora ?
Dear friends, please help with ID.
Most of the aspects resemble to that of Ageratina adenophora … but not confident. Please validate.
Found along NH 49
near Chinnakanal, Munnar.

Nice pictures and right id 


 

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Weed/ABOCT16 : 3 posts by 2 authors.
This weed is more common on the lower reaches of Dharamshala but we have some plants here at 1750m too. It’s reddish brown stalk is quite noticeable. Please help identify it.


This is a cumbersome weed, Ageratina adenophora..


 

 

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Plant For ID : Mahabaleshwar : 12AUG15 : AK-25 : 25/25 : 3 posts by 2 authors. Attachments (1)
Plant seen in Mahabaleshwar on 20th July,15.

Not sure if cultivated or growing wild.
I have only this picture.


This should be Ageratina adenophora.. wild, noxious weed..


These plants were seen growing everywhere.

I could not recollect the name.
Thanks for the id.


 

It is my pleasure to share few images of Ageratina adenophora (Asteraceae 

Habit: Herb 

Habitat: Wild, Moist decidouous forest fringe. 

Sighting: Foot hills of Mullaianagiri, Chikmagalur, Karnataka, about 1200 msl 

Date: 18-03-2015


Pictures are very nice, but this plant is not…


Kindly examine the images and description for Ageratina adenophora in the following Link. I think the images uploaded by me matches.
Yes, the identification is alright, my comment was regarding ferocious nature of this weed…


 

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Ageratina altissima var. altissima (L.) R.M.King & H.Rob.. : 3 posts by 2 authors. Attachments (2)
Ageratina altissima (L.) R.M.King & H.Rob

(= Eupatorium rugosum Houtt.), Fam Asteraceae, Kodaikana area, Tamilnadu


This the only post on Ageratina altissima (L.) R.M.King & H.Rob
Is it not the more common Ageratina adenophora (Spreng.) R.M.King & H.Rob. (to me it seems to match with the images herein)?
Also as per efi thread: Ageratina genus in India is represented by four wild or naturalized species (A.adenophora, A.ligustrina, A.riparia and A.trapezoidea).
One of the most common species is A.adenophora (Spreng.) R.M.King & H.Rob.


Thank you …, you are correct. It is Ageratina adenophora



References:

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