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, dirty white. Leaves, narrow, long, crowded and bunched at intervals along the stem, almost whorled in appearance. August and September.
A common, plebeian plant with the typical flowers in close, flat heads. Growing in sandy, sterile soil on Long Island southward to Virginia and Kentucky. Height, 1 to 2 feet. The flower has neither beauty of color nor fragrance. (See illustration, p. 131.)

Hyssop-Leaved thoroughwort (Eupatorium hyssopifoliiun)
 
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