From Wikipedia, the free encyclopedia Ambrosia pumila
Ambrosia pumila
Ambrosia pumila produces vegetatively, sending up new sprouts from an
elongated rhizome system.
Conservation status Critical habitat was declared for the species in 2010,
listing areas that should be protected for the survival
of the plant.[2] It is adapted to dry habitat, but only on
floodplains that are periodically submerged, or in de-
pressions containing vernal pools or similar structures.[2]
Critically Imperiled (NatureServe) It is a plant of open habitat and is probably not tolerant
Scientific classification of shade.[2] Protected areas containing this plant include
sections of land in the cities of Temecula and Oceanside,
Kingdom: Plantae
near Fallbrook and Lake Hodges, and within the bounds
(unranked): Angiosperms of Mission Trails Regional Park and the San Diego Nation-
al Wildlife Refuge.[2]
(unranked): Eudicots
One threat to the species is the invasion of non-native
(unranked): Asterids weeds, which tower over the plant and shade it out. It is
challenging to remove the dense stands of weeds without
Order: Asterales
injuring the rare plant.[3][4]
Family: Asteraceae
Subfamily: Heliantheae References
Genus: Ambrosia [1] The Nature Conservancy
Species: A. pumila [2] ^ USFWS. Final Rule Designating Critical Habitat
for Ambrosia pumila (San Diego ambrosia). Federal
Binomial name Register November 30, 2010.
Ambrosia pumila [3] Kelly, M., et al. (2007). Spraying over the top of
(Nutt.) A.Gray Ambrosia pumila, a federally listed species, to
control invasive weeds. Proceedings California
Synonyms
Invasive Plant Council Symposium 2007.
Franseria pumila [4] Maher, E. and E. Stanton. (2006). Response of the
endangered San Diego ambrosia (Ambrosia pumila)
Ambrosia pumila is a rare species of ragweed known by to removal of competition from non-native plants.
the common names dwarf burr ragweed and San Diego Proceedings California Invasive Plant Council
ambrosia.
ambrosia It is native to far southern California and Baja Symposium 2006.
California where it grows in floodplains and scrub. Today
it is known from 19 populations. Fourteen of them are
in San Diego County, two exist in Riverside County, and
External links
there are three south of the border in Mexico.[1] Most • Jepson Manual Treatment
of its native habitat has been consumed by urbanization • USDA Plants Profile
and development. It is also threatened by agriculture. • Photo gallery
This is a federally listed endangered species of the United
States.
This is a hairy perennial herb not exceeding half a
Further reading
meter in height. The leaves are gray-green and fuzzy and • McGlaughlin, M. E. and E. A. Friar. (2007). Clonality in
divided into several subdivided segments. They are up to the endangered Ambrosia pumila (Asteraceae)
13 centimeters long, not counting the winged petioles. inferred from RAPD markers; Implications for
The inflorescence is tipped with staminate (male) flower conservation and management. Conservation Genetics
heads above several larger pistillate (female) heads. The 8:2 319.
pistillate heads each yield usually one fruit, which is a
fuzzy burr only a few millimeters wide with short, soft
spines. The plant rarely produces seeds.[2] The plant re-
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From Wikipedia, the free encyclopedia Ambrosia pumila
Retrieved from "http://en.wikipedia.org/w/index.php?title=Ambrosia_pumila&oldid=406717899"
Categories:
• NatureServe Critically Imperiled species
• Flora of Baja California
• Flora of California
• Ambrosia
• Heliantheae stubs
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