Coefficient of Conservatism:
Coefficient of Wetness:
R. W. Smith
Introduced from Eurasia to roadsides, railroads, gardens, and disturbed ground generally, thriving where salting of streets and highways has killed the competition; also in marshy ground. First collected in Keweenaw Co. in 1885.
Often only the lowest leaves have the distinctive, forward pointing lobes, and some collections lack lobes. Such narrow-leaved plants lacking the lobes may resemble A. littoralis L., which differs in having the bracteoles surrounding the seeds spongy-thickened towards the base at maturity.