Annuals (sometimes persisting), (5-)10-30+[-80] cm, not notably scented. Stems green or reddish, decumbent (sometimes rooting at nodes) or ascending to erect, branched mostly proximally, ± strigoso-sericeous or villous, glabrescent. Leaf blades 15-35 × 8-16 mm, 1-2-pinnately lobed (ultimate lobes triangular to narrowly elliptic or linear). Peduncles mostly 4-15 cm (sometimes clavate in fruit). Involucres 6-13 mm diam., ± villous. Receptacles paleate throughout; paleae lanceolate to oblanceolate, weakly navicular (± carinate), 3-4+ mm (including acuminate-spinose tips). Ray florets 5-20, pistillate, fertile; corollas white, rarely tinged with pink, laminae 5-15 mm. Disc corollas (sometimes tinged with purple) 2-3(-4) mm. Cypselae 1.7-2+ mm, ribs smooth or weakly tuberculate (sometimes separated by relatively deep furrows); pappi 0 or coroniform (0.01+ mm). 2n = 18. Flowering May-Jul(-Sep). Disturbed sites, abandoned plantings; 10-400+ m; introduced; B.C., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que.; Ala., Calif., Colo., Conn., Del., D.C., Fla., Ga., Idaho, Ill., Ind., Iowa, Ky., La., Maine, Md., Mass., Miss., Mo., Nebr., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Oreg., Pa., R.I., S.C., Tenn., Vt., Va., Wash., W.Va., Wyo.; Europe. Anthemis arvensis is morphologically variable; it is found throughout much of North America.
From Flora of Indiana (1940) by Charles C. Deam
This species has been reported from Clark, Monroe, and St. Joseph Counties.
Indiana Coefficient of Conservatism: C = null, non-native
Wetland Indicator Status: N/A
Diagnostic Traits: Not malordorus; leaves finely dissected; rays white, pistillate; receptacle with chaff; achenes 4-angled.
Similar to no. 3 [Anthemis cotula L.], commonly a little more hairy, and not ill-scented; lvs appearing a little less finely dissected; heads averaging a little larger; rays pistillate and fertile; receptacle chaffy throughout, its bracts softer, paleaceous, with short, cuspidate awn-tip; achenes not tuberculate; 2n=18. Fields and waste places; native of Europe, naturalized over most of the U.S., and widespread in our range. May-Aug.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.