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Ambrosia eriocentra
''Ambrosia eriocentra'' is a North American species of ragweed known by the common names woolly bursage and woollyfruit burr ragweed.〔(Calflora taxon report, University of California, ''Ambrosia eriocentra'' (A. Gray) Payne woolly bur sage, wooly bursage )〕 It is native to the southwestern United States (California, Arizona, Nevada, Utah), where it grows in the deserts and surrounding ridges up to about 1700 meters in elevation.〔(Biota of North America Program 2013 county distribution map )〕
''Ambrosia eriocentra'' is a rounded shrub reaching over 1.5 meters in height. The stems are brownish gray in color, with young twigs coated in light woolly fibers and older branches bare. Leaves are lance-shaped and up to 9 centimeters long, not counting the winged petioles. The leaves have rolled lobed or toothed edges. As in other ragweeds, the inflorescence has a few staminate (male) flower heads next to several single-flowered pistillate heads. The fruit is a green burr with long, silky white hairs and several hair-tufted sharp spines. The burr is around a centimeter long.〔(Flora of North America, Vol. 21 Page 13 Ambrosia eriocentra (A. Gray) W. W. Payne, J. Arnold Arbor. 45: 423. 1964. )〕〔(Payne, Willard William 1964. Journal of the Arnold Arboretum 45(4): 423-424 )〕
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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