News tagged with oak
Geologist investigates canyon carved in just three days in Texas flood
In the summer of 2002, a week of heavy rains in Central Texas caused Canyon Lake -- the reservoir of the Canyon Dam -- to flood over its spillway and down the Guadalupe River Valley in a planned diversion ...
Space & Earth / Earth Sciences
Jun 20, 2010 |
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Of microorganisms and man: First large-scale test confirms Darwin's theory of universal common ancestry
More than 150 years ago, Darwin proposed the theory of universal common ancestry (UCA), linking all forms of life by a shared genetic heritage from single-celled microorganisms to humans. Until now, the theory that makes ...
May 12, 2010 |
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Study finds that mild winters are detrimental to butterflies
The recent mild winter throughout much of the United States was a cause for celebration for many. However, butterfly aficionados shouldn't be joining in the celebration.
Apr 20, 2012 |
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Old-growth tree stumps tell the story of fire in the upper Midwest
Researchers have constructed a 226-year history of fire in southern Illinois by looking at fire scars in tree stumps. Their study, the most in-depth fire history reported for the upper Midwest, reveals that ...
Mar 14, 2011 |
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Calif. utility stumbles on 1.4M years old fossils
(AP) -- A utility company preparing to build a new substation in an arid canyon southeast of Los Angeles has stumbled on a trove of animal fossils dating back 1.4 million years that researchers say will fill in blanks in ...
Other Sciences / Archaeology & Fossils
Sep 21, 2010 |
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Invasive Species on the March: Variable Rates of Spread Set Current Limits to Predictability
(PhysOrg.com) -- Whether for introduced muskrats in Europe or oak trees in the United Kingdom, zebra mussels in United States lakes or agricultural pests around the world, scientists have tried to find new ...
Sep 17, 2009 |
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Danger lurks underground for oak seedlings
Scientists trying to understand why oaks are starting to disappear from North American forests may need to look just below the surface to find some answers.
Mar 03, 2009 |
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Do urban 'heat islands' hint at trees of future?
City streets can be mean, but somewhere near Brooklyn, a tree grows far better than its country cousins, due to chronically elevated city heat levels, says a new study. The study, just published in the journal ...
Apr 24, 2012 |
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History is key factor in plant disease, study finds
(Phys.org) -- The virulence of plant-borne diseases depends on not just the particular strain of a pathogen, but on where the pathogen has been before landing in its host, according to a new study from researchers ...
Apr 19, 2012 |
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Study shows forest insects and diseases arrive in US via imported plants
The trade in live plants from around the world has become a major industry in the United States, with new imports now valued at more than $500 billion annually. According to a study conducted by researchers ...
Apr 09, 2012 |
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Out of Africa and Into the American Midwest
Grasses bend in the wind, their golden tips tracing arcs across fields that stretch toward the horizon. Sunwashed by a fading evening light, these reedy ballet dancers are central figures in savanna, an ecosystem ...
Jan 09, 2012 |
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Firewood movement leading cause of oak infestation in San Diego County
A catastrophic infestation of the goldspotted oak borer, which has killed more than 80,000 oak trees in San Diego County in the last decade, might be contained by controlling the movement of oak firewood from that region, ...
Sep 02, 2011 |
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Oak trees have a lot of gall
Those valley oak trees (Quercus lobata) in California's Central Valley have a lot of gall.
Mar 31, 2011 |
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Pollen also appears outside flowering season
"There is of course a very close relationship between the moment at which pollen is released by plants and the data gathered by the traps used to measure these grains, but this is not always the case", Rafael Tormo, a botanist ...
Mar 18, 2011 |
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New app to report sudden oak death on smartphones
California’s majestic oak trees have been felled by the hundreds of thousands by a disease first reported in 1995 and dubbed “sudden oak death.” To get a broader perspective on the disease, UC Berkeley scientists ...
Jan 06, 2011 |
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Oak
An oak is a tree or shrub in the genus Quercus ( /ˈkwɜrkəs/; Latin "oak tree"), of which about 600 species exist. "Oak" may also appear in the names of species in related genera, notably Lithocarpus. The genus is native to the northern hemisphere, and includes deciduous and evergreen species extending from cold latitudes to tropical Asia and the Americas.
Oaks have spirally arranged leaves, with a lobed margin in many species; some have serrated leaves or entire leaves with a smooth margin. The flowers are catkins, produced in spring. The fruit is a nut called an acorn, borne in a cup-like structure known as a cupule; each acorn contains one seed (rarely two or three) and takes 6–18 months to mature, depending on species. The live oaks are distinguished for being evergreen, but are not actually a distinct group and instead are dispersed across the genus.
For more information about Oak, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
