This section is from the book "A Manual Of Weeds", by Ada E. Georgia. Also available from Amazon: A Manual Of Weeds.
Introduced. Annual or winter annual. Propagates by seed.
Time of bloom: June to August.
Seed-time: July to September.
Range: Newfoundland to New Jersey, westward as far as Michigan.
Habitat: Cultivated fields, meadows, roadsides, and waste places.
Not so disagreeable a plant as the ill-scented Dog Fennel, but a gross feeder and holding ground which should be occupied by better plants. Stem one to two feet in height, smooth or nearly so, very much branched. Leaves alternate, numerous, deep green, sessile, twice or thrice pinnately dissected into linear, almost thread-like, lobes, the rachis somewhat dilated at base. Heads terminal on the many branchlets, about an inch broad, on naked peduncles; rays twenty to thirty, white, spreading, pistillate, and fertile; disk-florets yellow, tubular, perfect, and fertile, their corollas five-toothed; bracts of the involucre green, with brown, scarious margins, obtuse, and spreading. Achenes strongly three-ribbed, tipped with a short, entire-edged or four-toothed crown.
Means of control the same as for Mayweed. (Fig. 342.)
Fig. 342. - Scentless Chamomile (Matricaria inodora). X 1/3.