Eupatorium capillifolium (dogfennel) is a North American perennial herbaceous plant in the family sunflower family, native to the eastern and south-central United States.[3] It is generally between 50 cm and 2 meters tall with several stems that fork from a substantial base.[4] The stems and base are covered in leaves so dissected that they resemble branching green threads coming out of the stem in fractal patterns. When crushed, the leaves and flowers smell rather unpleasant.[4]

Dogfennel thrives on roadsides,[5] in fields and reduced tillage crops, as well as areas that have burned or otherwise been disturbed.[5] It is found in the early to middle (seral) stages of ecological succession. It is native to the southern and eastern United States, from Massachusetts south to Florida, and west to Missouri and Texas,[8][9] and also Cuba and the Bahamas.[10] Unlike insect-pollinated plants in this genus, E. capillifolium is wind-pollinated.[10]
Dogfennel spreads by both seeds and rootstocks and can grow quite aggressively. It is common in pastures, especially those that are unimproved or overgrazed,[5] and degrades the quality of the pasture by competing with desired forage species.[11] Dogfennel contains liver-damaging pyrrolizidine alkaloids, so livestock are known to eat all the turf around a stand of it. To remove infestations of dogfennel, the recommended course of action is to mow it and apply herbicides.[11]

It has also been introduced outside its native range, for example in Nepal.[12]

(from Wikipedia on 16.6.17)



Plant for id validation-Eupatorium capillifolium? : 7 posts by 3 authors. Attachments (4)

Please provide your inputs regarding the id of this shrub, which was hurriedly recorded by me from a public place in Amarkantak, M.P.
I think this as well as THIS belongs to Eupatorium capillifolium, and if this id is right, this is addition to our database.

To me appears close as per images at

In attached images leaves are finely dissected into capillary segments and distinguish this species from other species. A native to America. Distributed in India in Uttarakhand, Uttar Pradesh, Arunachal Pradesh, Meghalaya, Madhya Pradesh and Rajasthan.
This should be Eupatorium capillifolium (Lam.) Small ex Porter & Britton

Thanks a lot … for validating the id..

Yes it is Eupatorium capillifolium (Lam.) Small ex Porter & Britton” – dog fennel