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Tanacetum parthenium (L.) Sch.Bip.   (redirected from: Matricaria parthenium L.)
Family: Asteraceae
Feverfew
[Leucanthemum parthenium, moreMatricaria parthenium L., Pyrethrum parthenium , Tanacetum pathenium (L.) Sch. Bip.]
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Linda E. Watson in Flora of North America (vol. 19, 20 and 21)
Perennials, (20-)30-60(-80) cm. Stems 1-3+ (ridged), erect, branched (usually glabrous proximally, puberulent distally). Leaves mainly cauline; petiolate; blades ovate to rounded-deltate, 4-10+ × 1.5-4 cm, usually 1-2-pinnately lobed (primary lobes 3-5+ pairs, ± ovate), ultimate margins pinnatifid to dentate, faces (at least abaxial) usually puberulent, gland-dotted. Heads 5-20(-30) in corymbiform arrays. Involucres 5-7 mm diam. Ray florets 10-21+ (more in 'doubles'), pistillate, fertile; corollas white, laminae 2-8(-12) mm. Disc corollas ca. 2 mm. Cypselae ± columnar, 1-2 mm, 5-10-ribbed; pappi 0 or coroniform, 0.1-0.2+ mm. 2n = 18. Flowering Jun-Nov. Disturbed sites, urban areas, roadsides, fields, abandoned plantings; 10-1900 m; introduced; B.C., Ont.; Ala., Colo., Conn., Del., Idaho, Ill., Ind., Ky., Maine, Md., Mass., Mich., Miss., Mo., Mont., Nev., N.H., N.J., N.Y., N.C., Ohio, Oreg., Pa., R.I., S.C., Utah, Vt., Wash., W.Va., Wis., Wyo.; Eurasia; n Africa; widely naturalized in New World and Old World. Tanacetum parthenium is widely cultivated throughout North America.

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Tony Frates
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Tony Frates
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The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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