| 词条 | Ambrosia eriocentra |
| 释义 |
| name = Woolly bursage | image = Ambrosia eriocentra 4.jpg | image_caption = Woolly bursage on a portion of periodically exposed, dry river bed (Red Rock Canyon in the Spring Mountains of southern Nevada, elevation about 1300 m). | genus = Ambrosia | species = eriocentra | authority = (A.Gray) W.W.Payne[1][2] | synonyms_ref = [3] | synonyms =
}}Ambrosia eriocentra is a North American species of ragweed known by the common names woolly bursage and woollyfruit burr ragweed.[4] DistributionThe plant is native to the Mojave Desert in the southwestern United States, within southern California, southern Nevada, northwestern Arizona, and southwestern Utah.[4] It grows in the Mojave's plains and mountain ridges up to {{convert|1700|m|ft}} in elevation.[1][5] DescriptionAmbrosia eriocentra is a rounded shrub reaching over {{convert|1.5|m|ft}} 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.[1]As in other ragweeds, the inflorescence has a few staminate (male) flower heads next to several single-flowered pistillate heads. The bloom period is April to June.[1] The fruit is a green burr with long, silky white hairs and several hair-tufted sharp spines. The burr is around a centimeter long.[1][6][7] References1. ^1 2 3 4 Jepson eFlora: Ambrosia eriocentra 2. ^In: Journal of the Arnold Arboretum 45(4): 423. 1964. {{ cite web |url=http://www.tropicos.org/Name/2709270 |title=Name - Ambrosia eriocentra (A.Gray) W.W.Payne |quote=Basionym: Franseria eriocentra A.Gray; Published in The Proceedings of the American Academy of Arts and Sciences 7(2): 355. 1868. |work=Tropicos |publisher=Missouri Botanical Garden |location=Saint Louis, Missouri |accessdate=March 25, 2010}} 3. ^The Plant List Ambrosia eriocentra (A.Gray) W.W.Payne 4. ^1 Calflora taxon report, University of California, Ambrosia eriocentra (A. Gray) Payne woolly bur sage, wooly bursage 5. ^Biota of North America Program 2013 county distribution map 6. ^Flora of North America, Vol. 21 Page 13 Ambrosia eriocentra (A. Gray) W. W. Payne, J. Arnold Arbor. 45: 423. 1964. 7. ^[https://www.biodiversitylibrary.org/page/8442726#page/426/mode/1up Payne, Willard William 1964. Journal of the Arnold Arboretum 45(4): 423-424] External links
6 : Ambrosia (plant)|Flora of the California desert regions|Flora of the Southwestern United States|Natural history of the Mojave Desert|Plants described in 1868|Taxa named by Asa Gray |
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