Helenium amarum

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Helenium amarum
Helenium amarum1.jpg
Scientific classification
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H. amarum
Binomial name
Helenium amarum
Synonyms[1][2]
  • Gaillardia amara Raf.
  • Galardia amara Raf.
  • Helenium badium (A.Gray ex S.Watson) Greene

Helenium amarum is a species of annual herb in the daisy family known by the common names yellowdicks, yellow sneezeweed, fiveleaf sneezeweed, and bitter sneezeweed. It is native to much of the south-central United States (Texas, Oklahoma, Louisiana, Arkansas, New Mexico)[3] and northern Mexico (Chihuahua, Coahuila),[4] and it is present elsewhere in North America, Australia, and the West Indies as an introduced species.[3][5][6][7]

Helenium amarum is a multibranched bushy erect plant reaching 20 to 70 centimeters (8-28 inches) in height and thickly foliated in narrow to threadlike leaves. The tops of stem branches hold inflorescences of many daisy-like flower heads. Each head has a rounded center of sometimes as many as 250 golden yellow disc florets and a fringe of 8-10 usually lighter yellow ray florets which are reflexed away from the center. The fruit is a tiny achene about a millimeter long. This herb is weedy in some areas.[4]

The plant is somewhat toxic to mammals[8] and insects[9] due to the presence of the lactone tenulin.

Varieties[1][4]

References[edit]

  1. ^ a b "Helenium amarum". The Plant List. Missouri Botanical Garden. Royal Botanic Gardens, Kew.CS1 maint: others (link)
  2. ^ "Gaillardia amara". Tropicos. Missouri Botanical Garden.
  3. ^ a b "Helenium amarum". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014.
  4. ^ a b c Bierner, Mark W. (2006). "Helenium amarum". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). 21. New York and Oxford – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  5. ^ Turner, B. L. 2013. The comps of Mexico. A systematic account of the family Asteraceae (chapter 11: tribe Helenieae). Phytologia Memoirs 16: 1–100.
  6. ^ Tropicos, specimen listing for Helenium amarum (Raf.) H. Rock
  7. ^ Queensland Government, Department of Agriculture and Fisheries, Bitter weed (Helenium amarum)
  8. ^ Ivie, G. W., et al. (1975). Toxicity and milk bittering properties of tenulin, the major sesquiterpene lactone constituent of Helenium amarum (bitter sneezeweed). J Agric Food Chem 23:5 845-9.
  9. ^ Arnason, J. T., et al. (1987). Mode of action of the sesquiterpene lactone, tenulin, from Helenium amarum against herbivorous insects. J Nat Prod 50:4 690-5.

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