Coming up as a weed in my bushes and roadsides...about 3 feet tall.
I think it's Chrysanthemum leucanthemum - Oxeye Daisy. Chrysanthemum leucanthemum is a synonym for Leucanthemum vulgare, which is now the most widely accepted scientific name.
it's an aster of some type. to identify which aster is it, you need to look at the leaf shape, stem arrangement, etc. here is a good guide for new england asters. http://www.nttlphoto.com/botany/asters-goldenrods/a&g_main.htm
i have seen the asters you depict in MA and in CT this weekend, so this guide should work.
It's one of the many white, fall-blooming asters. At least they used to be asters; many of them have been moved to genus Symphyotrichum. Yours may be Symphyotrichum lateriflorum (but that is just a guess as there are many very similar species).
Thanks! So far it looks like this one:
I still have to look through them all...
The flowers do remind me of chamomille...but sure that's not it...leaves are all wrong.
I'm pretty sure it's a Symphyotrichum (formerly Aster) sp. Years ago I remember helping a friend ID some plants for a course she was taking for fall semester. The plants samples had to be fresh and locally grown... so we ended up with more than one of the asters. It was a real pain to ID them, even with a detailed key book... had to note the plant's habitat, measure height/spread, etc. and then for the fun part... dissect the flowers and measure and count each part including petals/rays, pappus, etc. I wouldn't even attempt to ID an exact species from a single photo.
This time of year and those leaves and the bloom description say common name" Willow Aster". I have these and love them hanging over the Coneflower stalks, Pretty weed for an invasive ,Bees and Butterflies love it