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Ambrosia cordifolia : ウィキペディア英語版 | Ambrosia cordifolia
''Ambrosia cordifolia'', called the Tucson Bur Ragweed,〔(Southeastern Arizona Wildflowers and Plants, ''Ambrosia cordifolia'' – Tucson Bur Ragweed )〕 is a North American species of plants in the sunflower family. It is native northern Mexico (Sonora, Sinaloa, San Luis Potosí, Guanajuato, Baja California Sur) and the State of Arizona in the United States.〔(Biota of North America Program 2014 county distribution map )〕〔(Tropicos, specimen listing for ''Ambrosia cordifolia'' (A. Gray) W.W. Payne )〕〔(Payne, Willard William 1964. Journal of the Arnold Arboretum 45(4): 421 )〕 ''Ambrosia cordifolia'' is a shrub up to 50 cm (20 inches) tall. Leaves are triangular or heart-shaped. Flower heads are small and inconspicuous, as the plant is wind-pollinated. The heads develop into spiny burs as the seeds ripen.〔(Flora of North America, Vol. 21 Page 14 ''Ambrosia cordifolia'' (A. Gray) W. W. Payne )〕 The reference to the Arizona City of Tucson in the common name refers to the fact that the species was first discovered by Cyrus G. Pringle in the mountains near Tucson in 1884.〔(Gray, Asa 1884. Synoptical Flora of North America 1(2): 445 ) as ''Franseria cordifolia''〕 ==References==
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