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Dog poison is an annual plant found growing in waste places
and gardens, and along hedges and fences, in the north- eastern
U.S., eastern Canada, and Europe. The white, spindle-shaped
root produces a round, slender, glabrous, blue-flecked, branched
stem, 1 to 3 feet high, with alternate, tripinnate leaves.
The leaflets are incised, dark green above and shiny yellow-green
beneath. White flowers appear from June to September.
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