Helenium thurberi

Helenium thurberi
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Asterids
Order:	Asterales
Family:	Asteraceae
Tribe:	Helenieae
Genus:	Helenium
Species:	H. thurberi
Binomial name
	Helenium thurberi; A.Gray 1883

Helenium thurberi is a North American plant in the sunflower family, commonly known as Thurber's sneezeweed.^[1] It is native to Mexico (Baja California Sur, Sinaloa, Nayarit, Chihuahua) and the southwestern United States (Arizona).^[2]^[3]

Helenium thurberi is an annual herb up to 100 cm (39.5 in) tall, with small wings running down the sides of the stems. Leaves are lance-shaped. One plant can produce up to 120 flower heads, in a branching array. Each head has an egg-shaped or conical disc that may contain 500 or more minuscule disc flowers each 1.0–1.3 mm (0.039–0.051 in) across, each yellow toward the bottom but brown or reddish-brown toward the tip. There are no ray flowers.^[1]

References[]

^ Jump up to: ^a ^b Flora of North America, Helenium thurberi A. Gray, 1883. Thurber’s sneezeweed
^ Turner, B. L. 2013. The comps of Mexico. A systematic account of the family Asteraceae (chapter 11: tribe Helenieae). Phytologia Memoirs 16: 1–100
^ Biota of North America Program 2014 county distribution map

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[iiiiiii-1] Jump up to: ^a ^b Flora of North America, Helenium thurberi A. Gray, 1883. Thurber’s sneezeweed

[2] Turner, B. L. 2013. The comps of Mexico. A systematic account of the family Asteraceae (chapter 11: tribe Helenieae). Phytologia Memoirs 16: 1–100

[3] Biota of North America Program 2014 county distribution map

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