This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Anthemis Cotula L. Sp. Pl. 894. 1753.
Maruta Co ula DC. Prodr. 6: 13. 1837.
Annual, glabrous, or sometimes pubescent above, glandular and with a fetid odor and acrid taste, much branched, 1°-2° high. Leaves mostly sessile, 1'-2' long, finely 1-3-pinnately dissected into narrow, or almost filiform, acute lobes; heads commonly numerous, about 1' broad; bracts of the involucre oblong, obtuse or obtusish, usually somewhat tomentose; rays 10-18, white, at length reflexed, neutral, or rarely with abortive pistils, mostly 3-toothed; receptacle convex, becoming oblong, its chaff bristly, subtending the central flowers; achenes 10-ribbed, rugose or glandular-tuberculate; pappus none.
In fields, waste places and along roadsides, all over North America except the extreme north. Naturalized from Europe, and widely distributed as a weed in Asia, Africa and Australia. Other names are mather, dog- or hog's-fennel, dog-finkle, morgan. Dog-daisy. Pig-sty-daisy. Maise. Chig-ger-weed. Balders. June-Nov.
Anthemis arvensis L. Sp. Pl. 894. 1753.
Annual or sometimes biennial, not fetid; stem finely pubescent, usually much branched, about 1° high, the branches decumbent or ascending. Leaves sessile, 1'-3' long, 1-2-pinnately parted into linear or lanceolate acute lobes, less divided than those of the preceding species and with broader segments; heads commonly numerous, 1'-1 1/2' broad; bracts of the involucre oblong, obtuse, usually somewhat pubescent, with broad scarious margins; rays 10-18, white, pistillate, spreading, mostly 2-toothed; chaff of the obtuse receptacle lanceolate, acute or acuminate; achenes oblong, obtusely 4-angled; pappus a mere border.
In fields and waste places, Nova Scotia to Virginia, west to Michigan, Missouri, and on the Pacific coast. Naturalized from Europe. May-Aug.
Anthemis nobilis L. Sp. Pl. 894. 1753.
Perennial, pubescent, aromatic, much branched, 6'-18' high, the branches procumbent. Leaves numerous, 1'-2' long, finely and compactly dissected into nearly filiform lobes and segments; heads about 1' broad; bracts of the involucre obtuse, pubescent, their scarious margins broad; rays 12-18, white, spreading, pistillate, 2-3-toothed; chaff of the conic receptacle broad, membranous, obtuse; achenes oblong, obtusely 3-angled; pappus none.
Sparingly escaped from gardens, Rhode Island to Delaware, Michigan and Wyoming. Adventive from Europe. June-Aug.
Anthemis tinctoria L. Sp. Pl. 896. 1753.
Perennial, pubescent or tomentose; stem erect, branched, 1°-3° high, with nearly erect branches. Leaves sessile, 1'-3' long, pinnately divided, the oblong segments pinnatifid into narrow acute lobes; heads few or several, 1'-1 1/2' broad; bracts of the involucre oblong, obtuse, densely tomentose; rays 20-30, pistillate, usually 2-toothed, bright yellow or sometimes paler; chaff of the nearly hemispheric receptacle lanceolate, acuminate, rather rigid; achenes 4-angled, somewhat compressed; pappus a crown-like border.
In fields and waste places, New Brunswick to New Jersey, and locally escaped from gardens. Adventive from Europe. Native also of Asia. June-Sept.
Anthemis aurea (L.) DC, a species with small ray-less heads, was found many years ago near St. Louis, Missouri.