Английская Википедия:Helenium thurberi
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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 Шаблон:Convert 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 Шаблон:Convert across, each yellow toward the bottom but brown or reddish-brown toward the tip. There are no ray flowers.[1]
References
- ↑ 1,0 1,1 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
