View source for Achillea millefolium

{{Treatment/ID
|accepted_name=Achillea millefolium
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 899. 1753
|year=1753
}}
|common_names=Common yarrow;achillée millefeuille;herbe-à-dinde
|special_status={{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Achillea alpicola
|authority=(Rydberg) Rydberg
|rank=species
}} {{Treatment/ID/Synonym
|name=Achillea arenicola
|authority=A. Heller
|rank=species
}} {{Treatment/ID/Synonym
|name=Achillea borealis subsp. arenicola
|authority=(A. Heller) D. D. Keck
|rank=subspecies
}} {{Treatment/ID/Synonym
|name=Achillea borealis subsp. californica
|authority=(Pollard) D. D. Keck
|rank=subspecies
}} {{Treatment/ID/Synonym
|name=Achillea californica
|authority=Pollard
|rank=species
}} {{Treatment/ID/Synonym
|name=Achillea gigantea
|authority=Nuttall
|rank=species
}} {{Treatment/ID/Synonym
|name=Achillea lanulosa
|authority=Pollard & Cockerell
|rank=species
}} {{Treatment/ID/Synonym
|name=Achillea lanulosa subsp. alpicola
|authority=(Rydberg) D. D. Keck
|rank=subspecies
}} {{Treatment/ID/Synonym
|name=Achillea laxiflora
|authority=(E. Meyer) Rydberg
|rank=species
}} {{Treatment/ID/Synonym
|name=Achillea megacephala
|authority=(de Candolle) Rafinesque ex Rydberg
|rank=species
}} {{Treatment/ID/Synonym
|name=Achillea millefolium var. alpicola
|authority=(Rydberg) Garrett
|rank=variety
}} {{Treatment/ID/Synonym
|name=Achillea millefolium var. arenicola
|authority=(A. Heller) Nobs
|rank=variety
}} {{Treatment/ID/Synonym
|name=Achillea millefolium var. asplenifolia
|authority=(Ventenat) Farwell
|rank=variety
}} {{Treatment/ID/Synonym
|name=Achillea millefolium subsp. borealis
|authority=(Bongard) Breitung
|rank=subspecies
}} {{Treatment/ID/Synonym
|name=Achillea millefolium var. borealis
|authority=(Bongard) Farwell
|rank=variety
}} {{Treatment/ID/Synonym
|name=Achillea millefolium var. californica
|authority=(Pollard) Jepson
|rank=variety
}} {{Treatment/ID/Synonym
|name=Achillea millefolium var. gigantea
|authority=(Pollard) Nobs
|rank=variety
}} {{Treatment/ID/Synonym
|name=Achillea millefolium subsp. lanulosa
|authority=(Nuttall) Piper
|rank=subspecies
}} {{Treatment/ID/Synonym
|name=Achillea millefolium var. lanulosa
|authority=(Nuttall) Piper
|rank=variety
}} {{Treatment/ID/Synonym
|name=Achillea millefolium var. litoralis
|authority=Ehrendorfer ex Nobs
|rank=variety
}} {{Treatment/ID/Synonym
|name=Achillea millefolium var. maritima
|authority=Jepson
|rank=variety
}} {{Treatment/ID/Synonym
|name=Achillea millefolium var. megacephala
|authority=(Raup) B. Boivin
|rank=variety
}} {{Treatment/ID/Synonym
|name=Achillea millefolium var. nigrescens
|authority=E. Meyer
|rank=variety
}} {{Treatment/ID/Synonym
|name=Achillea millefolium var. occidentalis
|authority=de Candolle
|rank=variety
}} {{Treatment/ID/Synonym
|name=Achillea millefolium var. pacifica
|authority=(Rydberg) G. N. Jones
|rank=variety
}} {{Treatment/ID/Synonym
|name=Achillea millefolium var. puberula
|authority=(Rydberg) Nobs
|rank=variety
}} {{Treatment/ID/Synonym
|name=Achillea nigrescens
|authority=
|rank=species
}} {{Treatment/ID/Synonym
|name=Achillea occidentalis
|authority=
|rank=species
}} {{Treatment/ID/Synonym
|name=Achillea pacifica
|authority=
|rank=species
}} {{Treatment/ID/Synonym
|name=Achillea puberula
|authority=
|rank=species
}} {{Treatment/ID/Synonym
|name=Achillea rosea
|authority=
|rank=species
}} {{Treatment/ID/Synonym
|name=Achillea subalpina
|authority=
|rank=species
}}
|hierarchy=Asteraceae;Asteraceae tribe Anthemideae;Achillea;Achillea millefolium
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Anthemideae]]</div><div class="higher-taxon"><small>genus</small>[[Achillea]]</div><div class="higher-taxon"><small>species</small>[[Achillea millefolium]]</div></div>
|volume=Volume 19
|mention_page=page 492
|treatment_page=page 493
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials,</b> 6–65+ cm (usually rhizomatous, sometimes stoloniferous). <b>Stems</b> 1(–4), erect, simple or branched, densely lanate-tomentose to glabrate. <b>Leaves</b> petiolate (proximally) or sessile (distally, weakly clasping and gradually reduced); blades oblong or lanceolate, 3.5–35+ cm × 5–35 mm, 1–2-pinnately lobed (ultimate lobes ± lanceolate, often arrayed in multiple planes), faces glabrate to sparsely tomentose or densely lanate. <b>Heads</b> 10–100+, in simple or compound, corymbiform arrays. <b>Phyllaries</b> 20–30 in ± 3 series, (light green, midribs dark green to yellowish, margins green to light or dark brown) ovate to lanceolate, abaxial faces tomentose. <b>Receptacles</b> convex; paleae lanceolate, 1.5–4 mm. <b>Ray</b> florets (3–)5–8, pistillate, fertile; corollas white or light pink to deep purple, laminae 1.5–3 × 1.5–3 mm. <b>Disc</b> florets 10–20; corollas white to grayish white, 2–4.5 mm. <b>Cypselae</b> 1–2 mm (margins broadly winged). <b>2n</b> = 18, 27, 36, 45, 54, 63, 72 (including counts from Europe).</span><!--

-->{{Treatment/Body
|phenology=Flowering late Apr–early Jul (south), mid Jul–mid Sep (north).
|habitat=Pastures, meadows, roadsides, stream sides, woodlands, waste grounds, dry or sandy soils, also in damp, clayey, and salty soils
|elevation=0–3600 m
|distribution=Greenland;St. Pierre and Miquelon;Alta.;B.C.;Man.;N.B.;Nfld. and Labr.;N.W.T.;N.S.;Nunavut;Ont.;P.E.I.;Que.;Sask.;Yukon;Ala.;Alaska;Ariz.;Ark.;Calif.;Colo.;Conn.;Del.;D.C.;Fla.;Ga.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Mich.;Minn.;Miss.;Mo.;Mont.;Nebr.;Nev.;N.H.;N.J.;N.Mex.;N.Y.;N.C.;N.Dak.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.C.;S.Dak.;Tenn.;Tex.;Utah;Vt.;Va.;Wash.;W.Va.;Wis.;Wyo.;Mexico;Eurasia.
|discussion=<p><i>Achillea millefolium</i> is morphologically variable and has been treated as either a single species with varieties or as multiple distinct species. At least 58 names have been used for North American specimens. Some early workers (e.g., J. Clausen et al. 1948) thought the native North American plants were taxonomically distinguishable from introduced, Old World plants. Other workers (e.g., R. J. Tyrl 1975) have treated <i>A. millefolium</i> as a cosmopolitan, Northern Hemisphere polyploid complex of native and introduced plants that have hybridized, forming diploid, tetraploid, pentaploid, hexaploid, septaploid, and octoploid plants and/or populations constituting a single, variable species.</p><!--
--><p>Morphologic characters that have been used to segregate these populations into species and/or varieties include: (1) degree and persistence of tomentum; (2) phyllaries with greenish, light brown, or dark brown margins; (3) shapes of capitulescences (rounded or flat-topped); and (4) degrees of leaf dissection and shapes of lobes.</p><!--
--><p>While examining specimens for this treatment, two general trends were noted: (1) Plants growing either at high latitudes or high elevations tend to have darker colored margins on the phyllaries. (2) Plants at high latitudes or elevations or from extreme desert locations tend to be more densely lanate than plants from less extreme habitats. These are only trends; variations in local populations due to local environmental conditions are to be expected.</p><!--
--><p>An ecomorphotype adapted to the Athabasca sand dunes of northern Saskatchewan has been known as A. megacephala or <i>A. millefolium</i> <i></i>var.<i> megacephala</i> and has been treated as a taxon of special concern in Canada (V. L. Harms 1999).</p>
|tables=
|references=
}}<!--

--><!--

-->{{#Taxon:
name=Achillea millefolium
|authority=Linnaeus
|rank=species
|parent rank=genus
|synonyms=Achillea alpicola;Achillea arenicola;Achillea borealis subsp. arenicola;Achillea borealis subsp. californica;Achillea californica;Achillea gigantea;Achillea lanulosa;Achillea lanulosa subsp. alpicola;Achillea laxiflora;Achillea megacephala;Achillea millefolium var. alpicola;Achillea millefolium var. arenicola;Achillea millefolium var. asplenifolia;Achillea millefolium subsp. borealis;Achillea millefolium var. borealis;Achillea millefolium var. californica;Achillea millefolium var. gigantea;Achillea millefolium subsp. lanulosa;Achillea millefolium var. lanulosa;Achillea millefolium var. litoralis;Achillea millefolium var. maritima;Achillea millefolium var. megacephala;Achillea millefolium var. nigrescens;Achillea millefolium var. occidentalis;Achillea millefolium var. pacifica;Achillea millefolium var. puberula;Achillea nigrescens;Achillea occidentalis;Achillea pacifica;Achillea puberula;Achillea rosea;Achillea subalpina
|basionyms=
|family=Asteraceae
|phenology=Flowering late Apr–early Jul (south), mid Jul–mid Sep (north).
|habitat=Pastures, meadows, roadsides, stream sides, woodlands, waste grounds, dry or sandy soils, also in damp, clayey, and salty soils
|elevation=0–3600 m
|distribution=Greenland;St. Pierre and Miquelon;Alta.;B.C.;Man.;N.B.;Nfld. and Labr.;N.W.T.;N.S.;Nunavut;Ont.;P.E.I.;Que.;Sask.;Yukon;Ala.;Alaska;Ariz.;Ark.;Calif.;Colo.;Conn.;Del.;D.C.;Fla.;Ga.;Idaho;Ill.;Ind.;Iowa;Kans.;Ky.;La.;Maine;Md.;Mass.;Mich.;Minn.;Miss.;Mo.;Mont.;Nebr.;Nev.;N.H.;N.J.;N.Mex.;N.Y.;N.C.;N.Dak.;Ohio;Okla.;Oreg.;Pa.;R.I.;S.C.;S.Dak.;Tenn.;Tex.;Utah;Vt.;Va.;Wash.;W.Va.;Wis.;Wyo.;Mexico;Eurasia.
|reference=None
|publication title=Sp. Pl.
|publication year=1753
|special status=Illustrated
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V19_822.xml
|tribe=Asteraceae tribe Anthemideae
|genus=Achillea
|species=Achillea millefolium
}}<!--

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