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Tanacetum parthenium
(L.) Sch. Bip.
Family:
Asteraceae
Feverfew
Images
not available
FNA
Resources
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.
2
n
= 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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