Ambrosia eriocentra

Woolly Bursage
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).
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Genus: Ambrosia
Species: A. eriocentra
Binomial name
Ambrosia eriocentra
(A.Gray) W.W.Payne[1]
Synonyms[2]
  • Franseria eriocentra A.Gray
  • Gaertneria eriocentra (A.Gray) Kuntze

Ambrosia eriocentra is a North American species of ragweed known by the common names woolly bursage and woollyfruit burr ragweed.[3] 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.[4]

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.[5][6]

References

  1. ↑ In: Journal of the Arnold Arboretum 45(4): 423. 1964. "Name - Ambrosia eriocentra (A.Gray) W.W.Payne". Tropicos. Saint Louis, Missouri: Missouri Botanical Garden. Retrieved March 25, 2010. Basionym: Franseria eriocentra A.Gray; Published in The Proceedings of the American Academy of Arts and Sciences 7(2): 355. 1868.
  2. ↑ The Plant List Ambrosia eriocentra (A.Gray) W.W.Payne
  3. ↑ Calflora taxon report, University of California, Ambrosia eriocentra (A. Gray) Payne woolly bur sage, wooly bursage
  4. ↑ Biota of North America Program 2013 county distribution map
  5. ↑ Flora of North America, Vol. 21 Page 13 Ambrosia eriocentra (A. Gray) W. W. Payne, J. Arnold Arbor. 45: 423. 1964.
  6. ↑ Payne, Willard William 1964. Journal of the Arnold Arboretum 45(4): 423-424

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