View source for Achillea

{{Treatment/ID
|accepted_name=Achillea
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 896. 1753
|year=1753
}}, {{Treatment/Publication
|title=Gen. Pl. ed.
|place=5, 382. 1754
|year=1754
}}
|common_names=Milfoil;achillée
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Anthemideae;Achillea
|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>
|etymology=for Greek god Achilles, who is supposed to have used the plants to treat his wounds
|volume=Volume 19
|mention_page=page 14, 487
|treatment_page=page 492
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials </b>[subshrubs], 6–80 cm (usually rhizomatous, sometimes fibrous rooted or taprooted; usually aromatic). <b>Stems</b> 1(–4+, clustered), usually erect, branched mostly distally, glabrous or sparsely to densely lanate (hairs usually basifixed). <b>Leaves</b> basal (often withering before flowering) and cauline; alternate; petiolate or sessile (bases ± clasping); blades (cauline equaling basal or slightly smaller distally) linear to oblong-lanceolate, usually 1–2[–4]-pinnately lobed, ultimate margins entire, abaxial faces sparsely to densely lanate, adaxial faces glabrate to sparsely tomentose. <b>Heads</b> radiate [discoid], in compact to open (± flat-topped), simple or compound, corymbiform arrays [borne singly]. <b>Involucres</b> campanulate to hemispheric, mostly 2–3(–5+) mm diam. <b>Phyllaries</b> persistent, 10–30 in (1–)2–3(–4) series, oblong, ovate, or oblanceolate to lanceolate (midribs conspicuous), unequal, margins and apices (pale to black) scarious. <b>Receptacles</b> usually flat to slightly convex, rarely conic, paleate; paleae membranous, ± folded (sometimes each with central resin duct). <b>Ray</b> florets [0] 3–5(–12+), usually pistillate and fertile; corollas usually white (laminae yellow at bases), sometimes pale yellow to pink or purple (tubes ± flattened), laminae orbiculate to suborbiculate (becoming reflexed). <b>Disc</b> florets usually (5–)15–75+, rarely 0, bisexual, fertile; corollas white to grayish or yellowish [yellow, pink], tubes ± flattened (bases ± saccate, clasping apices of cypselae), throats ± campanulate, lobes 5, ± deltate. <b>Cypselae</b> obcompressed, oblong to obovate (margins sometimes winged, apices rounded); ribs usually 2, lateral (sometimes plus 1 adaxial), faces glabrous (pericarps with myxogenic cells, sometimes with resin sacs; embryo sac development monosporic). <b>x</b> = 9.</span><!--

-->{{Treatment/Body
|distribution=Subtropic to temperate and arctic regions of North America and Eurasia.
|discussion=<p>Species ca. 115 (4 in the flora).</p><!--
--><p>Centers of diversity for <i>Achillea</i> are in Europe and Asia. <i>Achillea</i> ageratum, A. distans, and A. ligustica have been reported as occurring in North America. Labels on herbarium specimens examined indicated that those reports were based on cultivated plants; there is no evidence that any of the three has become established in our flora. <i>Achillea</i> filipendulina may be persistent or established in California (F. Hrusa et al. 2002) and in Michigan (E. Voss 1972–1996, vol. 3).</p><!--
--><p><i>Achillea</i> includes aromatic herbs with diverse vegetative morphologies. Floral characters show much less variation. Some species are widely cultivated both in Eurasia and North America. Interspecific hybridization has made identifications difficult and has evidently contributed to long lists of synonyms for some species.</p><!--
--><p>Plants of <i>Achillea</i> contain secondary metabolites with purported therapeutic and pharmacologic uses. Native Americans used the plants to treat earaches, diarrhea, and hemorrhages.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Leaf blades 1–2-pinnately lobed (lobes of single leaves often arrayed in multiple planes)
|[[#key-0-2| > 2]]
|-id=key-0-1
|1
|Leaf blades not lobed (margins usually serrulate, rarely subentire or serrate to doubly serrate)
|[[#key-0-3| > 3]]
|-id=key-0-2
|2
|Phyllaries 20–30 in 3 series; ray florets (3–)5–8, laminae 1.5–3 × 1.5–3 mm; cypselae 1–2 mm
|[[Achillea millefolium|Achillea millefolium]]
|-id=key-0-2
|2
|Phyllaries 10–13 in (1–)2 series; ray florets 8–10(–13), laminae 1–1.5 × 2–2.5 mm; cypselae 0.75–1 mm
|[[Achillea nobilis|Achillea nobilis]]
|-id=key-0-3
|3
|Ray laminae 4–5 mm; disc florets 45–75+; leaf margins usually serrulate, rarely subentire.
|[[Achillea ptarmica|Achillea ptarmica]]
|-id=key-0-3
|3
|Ray laminae 1–3 mm; disc florets 25–30+; leaf margins serrate or doubly serrate (teeth antrorse)
|[[Achillea alpina|Achillea alpina]]
|}
</div></div><!--

-->{{#Taxon:
name=Achillea
|author=Debra K. Trock
|authority=Linnaeus
|rank=genus
|parent rank=tribe
|synonyms=
|basionyms=
|family=Asteraceae
|illustrator=Linny Heagy
|illustration copyright=Flora of North America Association
|distribution=Subtropic to temperate and arctic regions of North America and Eurasia.
|reference=None
|publication title=Sp. Pl.;Gen. Pl. ed.
|publication year=1753;1754
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V19-20-21/V19_821.xml
|tribe=Asteraceae tribe Anthemideae
|genus=Achillea
}}<!--

-->[[Category:Treatment]][[Category:Asteraceae tribe Anthemideae]]