The Weed Atlas compiled here is hardly complete. I'm including those weeds that I find in New York City -in yards, in the cracks of sidewalks, in parks, on piers. read more
David G Seiter, author of Spontaneous Urban Plants: Weeds in NYC Answered Apr 20, 2016 There are between 150-200 varieties of urban flora which could could be commonly found. read more
NYC enjoys most of the weeds common to eastern North America, so that if you find yourself here and the weed you are trying to identify is in, say Clearfield, PA or Springfield, MA, the atlas may still be of use to you. read more