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Asteraceae family

Conyza bonariensis
(Linnaeus) Cronquist
, Bull. Torrey Bot. Club 70(6): 632.  1943.
Bas.: Erigeron bonariensis Linnaeus (1753). 

Indigenous rare herb of wet open spots, especially roadsides at middle elevations.
Probably native to the neotropics.
Conyza canadensis is a much more common species.