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|Family: Asteraceae (Compositae)||View Description||Dichotomous Key|
|Genus:||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Habit: Annual, perennial herb; <= 150 cm, glabrous or hairy, often aromatic. Stem: 1 or 2--5+, prostrate to erect, branched proximally and/or distally, glabrous or hairy. Leaf: basal and/or cauline, alternate, petioled or sessile, ovate or elliptic to obovate or spoon-shaped, generally 1--3-pinnately lobed, ultimate margins entire, crenate, or dentate. Inflorescence: heads radiate or radiant to disciform [discoid], generally in +- flat-topped clusters, subsessile or peduncled; involucre generally hemispheric or wider; phyllaries 30--60+, +- equal or graduated in 3--5+ series, free, persistent, lanceolate to oblong or +- ovate, outer sometimes keeled, margins and tips scarious, pale to sometimes +- brown or black; receptacle flat to conic or hemispheric, epaleate, glabrous or hairy. Ray Flower: 0 or 10--21, pistillate or sterile, ray oblong to fan-shaped, +- yellow or white [pink] (in disciform heads, peripheral pistillate flowers 8--30+, corolla pale yellow, +- bilateral, 3--4-lobed). Disk Flower: 60--300+; corolla yellow, tube < narrowly funnel-shaped throat, lobes (4)5, triangular; anther tip narrowly triangular; style tips truncate, brush-like. Fruit: obconic or +- cylindric, generally 5--10 ribbed, generally resin-gland-dotted; pappus a crown of short scales.
Species In Genus: 160 species: Europe, Asia, North America. Etymology: (Possibly Greek through Latin: immortality)
eFlora Treatment Author: Linda E. Watson
Jepson Online Interchange
Key to TanacetumPrevious taxon: Tagetes minuta
Next taxon: Tanacetum bipinnatum
Citation for this treatment: Linda E. Watson 2016. Tanacetum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=627, accessed on August 28, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on August 28, 2016.