Tanacetum Linnaeus (Q2113)
Tanacetum is a taxon with the rank genus within the subtribe Anthemidinae
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Tanacetum Linnaeus
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Tanacetum is a taxon with the rank genus within the subtribe Anthemidinae
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Statements
taxon/id/Tanacetum Linnaeus
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Tanacetum Linnaeus
Tanacetum
Linnaeus
FNA Editorial Committee. 2006. Flora of North America north of Mexico. Volume 19: Magnoliophyta: Asteridae, part 6: Asteraceae, part 1. Oxford University Press, New York.
accepted
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Stems 1 or 2–5+, erect or prostrate to ascending, branched proximally and/or distally, glabrous or hairy (hairs basifixed and/or medifixed, sometimes stellate).
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petiolate or sessile;
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blades mostly obovate to spatulate, usually 1–3-pinnately lobed, ultimate margins entire, crenate, or dentate, faces glabrous or hairy.
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Heads usually radiate, sometimes disciform (or quasi-radiate or radiant), usually in lax to dense, corymbiform arrays, rarely borne singly.
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Involucres mostly hemispheric or broader, (3–) 5–22+ mm diam.
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Phyllaries 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).
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Receptacles flat to conic or hemispheric (sometimes hairy), epaleate.
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Ray-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).
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Disc-florets 60–300+, bisexual, fertile;
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corollas yellow, tubes ± cylindric, throats narrowly funnelform to campanulate, lobes (4–) 5, ± deltate.
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Cypselae 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);
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x = 9 (polyploidy).
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singly
in lax to dense , corymbiform arrays; rarely
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