Tanacetum

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Tanacetum
Tansy.jpg
Tanacetum vulgare
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Tribe: Anthemideae
Genus: Tanacetum
L. (1753)
Type species
Tanacetum vulgare L.
Species

about 160, see text

Synonyms

Balsamita Mill.
Pyrethrum Zinn
Gymnocline Cass.
Pyrethrum Medik.
Spathipappus Tzvelev
Sources: ING,[1] E+M,[2] IPNI,[3] GRIN[4]

Tanacetum is a genus of about 160 species of flowering plants in the aster family, Asteraceae, native to many regions of the Northern Hemisphere.[5] They are known commonly as tansies.[5][4][6] The name tansy can refer specifically to Tanacetum vulgare, which may be called the common tansy or garden tansy for clarity.[6]

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 1.5 meters. 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 inflorescences. The flower has layers of distinct phyllaries 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.[5]

Selected species[edit]

Species include:[2][7][8]


References[edit]

  1. ^ "Tanacetum". Index Nominum Genericorum. International Association for Plant Taxonomy. 1996-02-09. Retrieved 2008-06-27. 
  2. ^ a b Botanic Garden and Botanical Museum Berlin-Dahlem. "Details for: Tanacetum". Euro+Med PlantBase. Freie Universität Berlin. Retrieved 2008-06-28. 
  3. ^ International Organization for Plant Information (IOPI). "Plant Name Search Results" (HTML). International Plant Names Index. Retrieved 2008-06-28. 
  4. ^ a b Genus: Tanacetum L. Germplasm Resources Information Network (GRIN).
  5. ^ a b c Tanacetum. Flora of North America.
  6. ^ a b Tanacetum. Integrated Taxonomic Information System (ITIS).
  7. ^ GRIN Species Records of Tanacetum. Germplasm Resources Information Network (GRIN).
  8. ^ Tanacetum species records. Flora of China.