''Tanacetum'' is a genus of about 160 species of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. They include all forbs (flowering plants without a woody stem), grasses and grass-like plants, a vast majority of ...

s in the aster family,

Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae ...

, native to many regions of the Northern Hemisphere.''Tanacetum''.
Flora of North America. They are known commonly as tansies.''Tanacetum''.
Integrated Taxonomic Information System (ITIS). The name tansy can refer specifically to ''

Tanacetum vulgare Tansy (''Tanacetum vulgare'') is a perennial, herbaceous flowering plant in the genus '' Tanacetum'' in the aster family, native to temperate Europe and Asia. It has been introduced to other parts of the world, including North America, and in ...

'', which may be called the common tansy or garden tansy for clarity. The generic name ''Tanacetum'' means 'immortality' in

Botanical Latin Botanical Latin is a technical language based on New Latin, used for descriptions of botanical taxa. Until 2012, International Code of Botanical Nomenclature mandated Botanical Latin to be used for the descriptions of most new taxa. It is still t ...

, since tansy was once placed between the burial sheets of the dead to repel vermin. Other familiar species include costmary (''T. balsamita'') and feverfew (''T. parthenium''). Tansies are mainly perennial herbs, but some are annuals and subshrubs. Some are a few centimeters tall and some reach . They vary in form, with one or more branching stems growing erect or prostrate, usually from rhizomes. They are hairy to hairless in texture, and most are aromatic. The leaves are alternately arranged, the blades sometimes borne on petioles. They are usually deeply lobed and may have toothed edges. Most species have flowers in loose or dense

inflorescence An inflorescence is a group or cluster of flowers arranged on a stem that is composed of a main branch or a complicated arrangement of branches. Morphologically, it is the modified part of the shoot of seed plants where flowers are formed ...

s. The flower has layers of distinct

phyllaries In botanical terminology, a phyllary, also known an involucral bract or tegule, is a single bract of the involucre of a composite flower. The involucre is the grouping of bracts together. Phyllaries are reduced leaf-like structures that form one ...

around its base and may be flat to hemispheric in shape. The flower has many yellow disc florets, sometimes over 300. Some species have ray florets in shades of yellow, or white with yellowish bases. Some species lack true ray florets but have flat yellowish disc florets that look like rays. The fruit is a ribbed, glandular cypsela, usually with a pappus on the end.

Selected species

Species include:''Tanacetum'' species records.
Flora of China. *''

Tanacetum abrotanifolium ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' (L.) Druce *'' Tanacetum abrotanoides'' *'' Tanacetum achilleifolium'' (M. Bieb.) Sch. Bip. *'' Tanacetum alatavicum'' *'' Tanacetum annuum'' – Moroccan Tansy, Blue Tansy *'' Tanacetum argenteum'' (Lam.) Willd. *'' Tanacetum atkinsonii'' (C.B.Clarke) Kitam. *'' Tanacetum balsamita'' L. – costmary *'' Tanacetum bipinnatum'' (L.) Sch. Bip. – Lake Huron tansy, camphor tansy *'' Tanacetum camphoratum'' Less. – dune tansy *'' Tanacetum cinerariifolium'' (Trevir.) Sch. Bip. – Dalmatian insect-flower, Dalmatian pyrethrum *''Tanacetum coccineum'' (Willd.) Grierson – garden pyrethrum, painted daisy, Persian insect-flower *'' Tanacetum corymbosum'' (L.) Sch. Bip. – scentless feverfew, corymbflower tansy *'' Tanacetum densum'' (Labill.) Sch. Bip. *''

Tanacetum falconeri ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' *''

Tanacetum ferulaceum ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' (Sch. Bip.) Walp. *''

Tanacetum haradjanii ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' (Rech. f.) Grierson *''

Tanacetum kaschgarianum ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' *''

Tanacetum krylovianum ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' *''

Tanacetum macrophyllum ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' (Waldst. & Kit.) Sch. Bip. – rayed tansy *''

Tanacetum microphyllum ''Tanacetum microphyllum'' is a species of flowering plant in the aster family, Asteraceae. It is endemic to the Iberian Peninsula.Abad, M. J., et al. (2003)The phytochemical and pharmacological investigations on ''Tanacetum microphyllum''.''Rec ...

'' DC. *''

Tanacetum niveum ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' *''

Tanacetum parthenifolium ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' (Willd.) Sch. Bip. *'' Tanacetum parthenium'' (L.) Sch. Bip. – feverfew *''

Tanacetum pinnatum ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' *''

Tanacetum polycephalum ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' *''

Tanacetum poteriifolium ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' (Nordm.) Grierson *''

Tanacetum praeteritium ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' (Horw.) Heywood *''

Tanacetum ptarmiciflorum ''Tanacetum ptarmiciflorum'' is a shrub with silvery leaves in the family Asteraceae. It is known as a decorative plant. It is commonly known as the silver lace bush, and its origin known to be in the Canary Islands. The species is endangered in ...

'' (Webb) Sch. Bip. – dusty-miller, silver-lace *''

Tanacetum pulchrum ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' *'' Tanacetum richterioides'' *'' Tanacetum santolina'' *''

Tanacetum scopulorum ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' *''

Tanacetum tanacetoides ''Tanacetum'' is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.

'' *'' Tanacetum tatsienense'' *''

'' L. – common tansy, garden tansy, golden-buttons

Gallery of species

File:Tanacetum balsamita 02.jpg, File:Tanacetumcamphoratum1.jpg, File:Tanacetum_cinerariifolium_-_Köhler–s_Medizinal-Pflanzen-269.jpg, File:Tanacetum_coccineum_-_Köhler–s_Medizinal-Pflanzen-037.jpg, File:Tanacetum corymbosum2 W.jpg, File:Tanacetum densum ssp. siasicum GotBot 2015.jpg, File:Tanacetum ferulaceum kz1.JPG, File:Chrysanthemum haradjanii 1.jpg, File:Tanacetum huronense.jpg, File:Tanacetum_macrophyllum-Stueber.jpg, File:Tanacetum niveum 'jackpot' 3.JPG, File:Tanacetum parthenium0.jpg, File:Tanacetum ptarmiciflorum 'Silver Feather' 2.JPG, File:Tanacetum siculum 0119.JPG, File:Pietaryrtti.jpg,

References

* * {{Taxonbar, from=Q54016 Asteraceae genera Taxa named by Carl Linnaeus