View source for Tanacetum

{{Treatment/ID
|accepted_name=Tanacetum
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 843. 1753
|year=1753
}}, {{Treatment/Publication
|title=Gen. Pl. ed.
|place=5, 366. 1754
|year=1754
}}
|common_names=Tansy;tanaisie
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Anthemideae;Tanacetum
|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>[[Tanacetum]]</div></div>
|etymology=Derivation unknown; possibly Greek athanasia, immortality, through Medieval Latin tanazita
|volume=Volume 19
|mention_page=page 31, 48, 49, 52, 53, 68, 486, 488
|treatment_page=page 489
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials </b>[annuals, subshrubs], 5–150 cm (usually rhizomatous; usually aromatic). <b>Stems</b> 1 or 2–5+, erect or prostrate to ascending, branched proximally and/or distally, glabrous or hairy (hairs basifixed and/or medifixed, sometimes stellate). <b>Leaves</b> basal and/or cauline; alternate; petiolate or sessile; blades mostly obovate to spatulate, usually 1–3-pinnately lobed, ultimate margins entire, crenate, or dentate, faces glabrous or hairy. <b>Heads</b> usually radiate, sometimes disciform (or quasi-radiate or -radiant), usually in lax to dense, corymbiform arrays, rarely borne singly. <b>Involucres</b> mostly hemispheric or broader, (3–)5–22+ mm diam. <b>Phyllaries</b> persistent, (20–)30–60+ in (2–)3–5+ series, distinct, ± ovate to oblong or oblong to lanceolate or lance-linear (sometimes carinate), unequal, margins and apices (pale to dark brown or blackish) scarious (tips sometimes dilated). <b>Receptacles</b> flat to conic or hemispheric (sometimes hairy), epaleate. <b>Ray</b> florets usually 10–21+ (pistillate and fertile or neuter; corollas pale yellow to yellow or white, usually with yellowish bases [pink], laminae oblong to flabellate), sometimes 0 (in disciform or quasi-radiate or -radiant heads, peripheral pistillate florets 8–30+; corollas pale yellow, ± zygomorphic, lobes 3–4, sometimes ± raylike). <b>Disc</b> florets 60–300+, bisexual, fertile; corollas yellow, tubes ± cylindric, throats narrowly funnelform to campanulate, lobes (4–)5, ± deltate. <b>Cypselae</b> obconic or ± columnar (circular in cross section), ribs (4–)5–10(–12+), faces usually gland-dotted, sometimes glabrous (pericarps without myxogenic cells or resin sacs, embryo sac development tetrasporic); pappi usually coroniform, rarely 0 [distinct scales or each pappus an adaxial auricle]. <b>x</b> = 9 (polyploidy).</span><!--

-->{{Treatment/Body
|distribution=North America;Europe;Asia;n Africa;some species widely cultivated.
|discussion=<p>Species 160 (4 in the flora).</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Leaves usually not pinnately lobed (sometimes with 1–4+ lateral lobes near bases of blades), ultimate margins ± crenate
|[[Tanacetum balsamita|Tanacetum balsamita]]
|-id=key-0-1
|1
|Leaves usually 1–3-pinnately lobed, ultimate margins entire or dentate
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Leaf blades 1–2-pinnately lobed (primary lobes 3–5 pairs, ± ovate), faces (at least abaxial) usually puberulent; ray florets 10–21+ (more in "doubles"), corollas white, laminae 2–8(–12+) mm; pappi 0 or coroniform (0.1–0.2+ mm)
|[[Tanacetum parthenium|Tanacetum parthenium]]
|-id=key-0-2
|2
|Leaf blades 2–3-pinnately lobed (primary lobes 4–24+ pairs, ± oblong to elliptic or linear), faces usually arachno-villous to villous, sometimes glabrescent or glabrous; ray florets 0 or 8–30+, corollas pale yellow to yellow, laminae 1–8+ mm; pappi coroniform (0.1–0.5+ mm)
|[[#key-0-3| > 3]]
|-id=key-0-3
|3
|Leaves: faces glabrous or sparsely hairy; heads (disciform) 20–200 in corymbiform arrays; involucres 5–10 mm diam
|[[Tanacetum vulgare|Tanacetum vulgare]]
|-id=key-0-3
|3
|Leaves: faces usually ± villous or arachno-villous to lanate, sometimes glabrescent or glabrate; heads (radiate, quasi-radiant or -radiate, or disciform) (2–)5–12(–20+) in corymbiform arrays or borne singly; involucres 8–22+ mm diam
|[[Tanacetum bipinnatum|Tanacetum bipinnatum]]
|}
</div></div><!--

-->{{#Taxon:
name=Tanacetum
|author=Linda E. Watson
|authority=Linnaeus
|rank=genus
|parent rank=tribe
|synonyms=
|basionyms=
|family=Asteraceae
|distribution=North America;Europe;Asia;n Africa;some species widely cultivated.
|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/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V19_816.xml
|tribe=Asteraceae tribe Anthemideae
|genus=Tanacetum
}}<!--

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