Vernonia species ?

Vernonia species ?;

Asteraceae ID from Hooghly 13-04-12 SK-3: This is a common undershrub found in rural roadside. It is also used as natural fence to guard frontyard or some cultivated garden plants. Could it be a Eupatorium sp.?
Species : UNKNOWN
Habit & Habitat : wild undershrub (?) of about 5 ft. height, roadside
Date : 08-04-2012, 10.30 a.m.
Place : Tarakeswar (Hooghly), WB
Nice pics, should be a Vernonia sp. in my opinion....
This is also a very common species. Villagers sometimes use this plant to build a natural boundary wall around their homeyard.
it is a common sight here and other butterflies also visit this plant.
i was wondering if it was Eupatorium species too
id please: photo from Marathwada region. found weed in nearby grassland cultivated area. Dec 2011.
Feel to me like Vernonia sp. may be V. cinerea   
it is Gynandropsis species