Ambrosia trifida

Family: Asteraceae
Common Names: Great Ragweed, Giant Ragweed

Synonyms:

Ambrosia aptera
Ambrosia trifida var. trifida
Ambrosia trifida var. texana

Ambrosia trifida var. integrifolia 
Ambrosia trifida var. aptera

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Native distribution -  USA: AL, AR, AZ, CA, CO, CT, DC, DE, FL, GA, IA, ID, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NY, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VA, VT, WA, WI, WV, WY
Canada: AB, MB, NB, NS, ON, PE, QC, SK

Additional Resources:
Flora of North America