Clearly it's an aster. Two of these plants are growing at Ives Preserve. Not far from them are New England, old field, lanceleaf and smooth asters. These have pink flowers and very hairy stems, so New England is very likely a parent. Old field and lanceleaf are white flowered, so one of those is probably the other parent. I suspect lanceleaf because the bracts on the heads are shorter than either old field or New England. But hybrids are tricky and we may never know for sure. It might even be a pink hairy lanceleaf (var. hirsuticaule).