This section is from the book "Harper's Guide To Wild Flowers", by Caroline A. Creevey. Also available from Amazon: Harper's Guide To Wild Flowers.
Color, white. Leaves, long and narrow, those from the root lobed. Stem, straight, slender, covered with bristly hairs. Heads of flowers in panicles, the rays having a cutoff appearance. July to October.
A coarse, ugly weed, in waste places everywhere.
 
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