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Helenium amarum
Also called Bitter Sneezeweed, American Sneezeweed, Bitterweed, Five Leaf Sneezeweed
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) and northern Mexico (Chihuahua, Coahuila), and it is present elsewhere in North America, Australia, and the West Indies as an introduced species.
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.
Helenium apterum · Helenium argentinum · Arizona sneezeweed · Helenium aromaticum · Common sneezeweed · Bigelow's sneezeweed · Coastal sneezeweed · Shortleaf sneezeweed · Oldfield sneezeweed · Helenium chihuahuensis · Fringed sneezeweed · Pretty sneezeweed
Text excerpted from the Wikipedia article Helenium amarum by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
