Ambrosia dumosa: Difference between revisions
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Burro weed, or '''''Ambrosia dumosa''''', is a common constituent of the creosote-bush scrub community throughout the deserts of the American Southwest. ''Ambrosia dumosa'' has been studied to determine [[allelopathy|allelopathic]] interactions with creosote bush, ''[[Larrea tridentata]]'', which produces a chemical that inhibits the growth of ''A. dumosa''. Other studies have suggested that ''A. dumosa'' roots prduce a chemical that causes them to grow away from conspecific roots, preventing competition for water resources. |
Burro weed, or '''''Ambrosia dumosa''''', is a common constituent of the creosote-bush scrub community throughout the deserts of the American Southwest. ''Ambrosia dumosa'' has been studied to determine [[allelopathy|allelopathic]] interactions with creosote bush, ''[[Larrea tridentata]]'', which produces a chemical that inhibits the growth of ''A. dumosa''. Other studies have suggested that ''A. dumosa'' roots prduce a chemical that causes them to grow away from conspecific roots, preventing competition for water resources. |
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===Morphology=== |
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A highly branched shrub 2 to 9 dm in height. The branch stems are covered with soft gray-white hairs and have compound mostly obvate leaves that are 1 to 3 pinnate and generally clustered on the short branches. The leaves are 0.5 to 4 cm wide and also covered in soft gray-white hairs. |
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Its infloresence is yellow with staminate and pistallate heads (monoecious). Staminate heads have many flowers and are 3 to 5 mm in diameter with a 5 to 8 lobed involucre. Pistallate heads are 2 flowered and lack corolla. |
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''A. dumosa'' has spherical fruits ranging in color from golden to purple to brown. Along with microscopic hairs, the fruit has 12 to 35 flat and straight spines which are 5 to 9 mm in length and scattered over the surface. |
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It has been noted that the wind blown pollen is often highly allergenic. |
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== References == |
== References == |
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Revision as of 06:52, 23 May 2006
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| Species: | A. dumosa
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| Ambrosia dumosa | |
Burro weed, or Ambrosia dumosa, is a common constituent of the creosote-bush scrub community throughout the deserts of the American Southwest. Ambrosia dumosa has been studied to determine allelopathic interactions with creosote bush, Larrea tridentata, which produces a chemical that inhibits the growth of A. dumosa. Other studies have suggested that A. dumosa roots prduce a chemical that causes them to grow away from conspecific roots, preventing competition for water resources.
Morphology
A highly branched shrub 2 to 9 dm in height. The branch stems are covered with soft gray-white hairs and have compound mostly obvate leaves that are 1 to 3 pinnate and generally clustered on the short branches. The leaves are 0.5 to 4 cm wide and also covered in soft gray-white hairs.
Its infloresence is yellow with staminate and pistallate heads (monoecious). Staminate heads have many flowers and are 3 to 5 mm in diameter with a 5 to 8 lobed involucre. Pistallate heads are 2 flowered and lack corolla.
A. dumosa has spherical fruits ranging in color from golden to purple to brown. Along with microscopic hairs, the fruit has 12 to 35 flat and straight spines which are 5 to 9 mm in length and scattered over the surface.
It has been noted that the wind blown pollen is often highly allergenic.
References
- Jepson Manual Treatment: Ambrosia dumosa
- Schoenerr, Allen A. (1992). A Natural History of California. Berkeley: University of California Press. ISBN 0-520-06922-6
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