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Ambrosia artemisiifolia
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Ambrosia artemisiifolia : ウィキペディア英語版
Ambrosia artemisiifolia

''Ambrosia artemisiifolia'', common ragweed, is the most widespread plant of the genus ''Ambrosia'' in North America. It has also been called annual ragweed, bitterweed, blackweed, carrot weed, hay fever weed, Roman wormwood, stammerwort, stickweed, tassel weed, and American wormwood. It is native to North America but a widespread and common invasive weed in much of South America, Australia, and Eurasia.〔(Flora of North America Vol. 21 Page 15 ''Ambrosia artemisiifolia'' Linnaeus, Sp. Pl. 2: 988. 1753. )〕〔(Flora of China Vol. 20-21 Page 876, 877 豚草 tun cao ''Ambrosia artemisiifolia'' Linnaeus, Sp. Pl. 2: 988. 1753. )〕〔(Biota of North America Program 2014 county distribution map )〕〔Hokche, O., P. E. Berry & O. Huber. (eds.) 2008. Nuevo Catálogo de la Flora Vascular de Venezuela 1–859. Fundación Instituto Botánico de Venezuela, Caracas. 〕〔Jørgensen, P. M., M. H. Nee & S. G. Beck. (eds.) 2015 en adelante. Catalogo de las plantas vasculares de Bolivia (adiciones). 〕〔(Altervista Flora Italiana, ''Ambrosia artemisiifolia'' L. )〕〔(Atlas of Living Australia, ''Ambrosia artemisiifolia'' L. Annual Ragweed )〕
The species name, ''artemisiifolia'', is given because the leaves were thought to bear a resemblance to the leaves of Artemisia, the true wormwoods.
==Description==
Common ragweed grows to about one meter (3 feet) in height. Its wind-dispersed pollen is a strong allergen to many people with hay fever. Common ragweed emerges in the late spring, and sets seed in later summer or fall.

File:Ambrosia artemisiifolia004.jpg|Close-up leaf
File:Ambrosia artemisiifolia inflorescence.jpg|Inflorescences (male capitules)
File:Ambrosia artemisiifolia male flowers.jpg|Close-up male capitules
File:Ambrosia artemisiifolia male and female flowers 02.jpg|Female flowers in leaf axil
File:Ambrosia artem1-5.jpg|Pollen core (scanning electron microscope)
File:Ambrosia artemisiifolia.jpg|Achenes


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Ambrosia artemisiifolia」の詳細全文を読む



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