Tanacetum

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{{Taxobox | color = lightgreen | name = Tanacetum | image = Tansy.jpg | image_width = 250px | image_caption = Tanacetum vulgare (Tansy) | regnum = Plantae | divisio = Magnoliophyta | classis = Magnoliopsida | ordo = Asterales | familia = Asteraceae | genus = Tanacetum | genus_authority = L. | subdivision_ranks = Species | subdivision = About 70 species, including:
Tanacetum abrotanifolium
Tanacetum achilleifolium
Tanacetum argenteum
Tanacetum atkinsonii
Tanacetum balsamita
Tanacetum bipinnatum
Tanacetum camphoratum
Tanacetum cinerariifolium
Tanacetum coccineum
Tanacetum compactum
Tanacetum corymbosum
Tanacetum densum
Tanacetum douglasi
Tanacetum ferulaceum
Tanacetum haradjanii
Tanacetum huronense
Tanacetum macrophyllum
Tanacetum nuttallii
Tanacetum parthenifolium
Tanacetum parthenium
Tanacetum potentilloides
Tanacetum poteriifolium
Tanacetum praeteritium
Tanacetum ptarmiciflorum
Tanacetum vulgare }}

Tanacetum is a genus of about 70 species of flowering plant in the family Asteraceae, native to temperate regions of the Northern Hemisphere.

Common names include Tansy (Tanacetum vulgare; sometimes called Common Tansy or Garden Tansy) and Feverfew (Tanacetum parthenium); several other species are also known as tansies. Other common names include Bachelor's Buttons, Bitter Buttons, Boerenwormkruid, Buttons, Ginger Plant, Gold-buttons, Ponso, Solucanotu, Tanaceto, Tansy, Yomogi-Giku.

The name tansy is also sometimes given, improperly, (e.g. in the western United States) to ragwort, because in those areas ragwort is known as "tansy ragwort".

Tanacetum species are used as food plants by the larvae of some Lepidoptera species including Bordered Pug, Grey Pug, Lime-speck Pug, Tawny Speckled Pug, Wormwood Pug and the Coleophora case-bearers C. chrysanthemi (feeds exclusively on T. corymbosum), C. tanaceti (feeds exclusively on T. vulgare) and C. trochilella.da:Rejnfan-slægten fr:Tanacetum