In many respects, hackberry is similar to the American elm
, to which it is related.
The Elm Research Institute (ERI), a New Hampshire-based nonprofit organization dedicated to restoring the American elm
tree, is encouraging communities to honor the birth of freedom in the United States with a "Liberty Tree" Memorial.
As a result, when arboretum scientists released two DED-resistant American elms
in 1995, the trees represented a very small part of the elm gene pool.
Now with these new disease-resistant strains, the American Elm
can once again resume its prominent place as a wonderful and majestic tree in our American landscape.
White and willow oaks, American elms
, southern magnolias, and flowering dogwoods dominate.
By the 1980s, the destructive fungus--Ophiostoma ulmi--had wiped out around 77 million American elms
that had survived years of threat from Dutch elm disease were felled and will be difficult, if not impossible, to replace.
When 1,000 mature American elms
mysteriously died in Illinois during the last decade, scientists at first suspected that the elm yellows (EY) plant pathogen was the culprit.
The National Park Service's suggestion probably surprised many of those who've mourned the loss of as many as 100 million American elms
to Dutch elm disease over the last 75 years.
Townsend has been on a quest for the last 20 years - a quest to find and develop disease-tolerant American elms
and return these prized trees to U.
Before the onslaught of Dutch elm disease, American elms
were a beloved urban tree thanks to their leafy canopy and ability to tolerate air pollution, road salt, and extremes in weather.
Denny Townsend, a research geneticist at the National Arboretum in Washington, DC, is widely known for his efforts to breed American elms
that would be resistant to the disease.
look like a vase, with arching branches that grow out from the trunk at a sharp angle.
Among the 68 trees to be cut are American elms
, sycamores, tulip poplars, a couple of Yoshino cherries, a dogwood, and one cucumber magnolia.
Efforts during the 20th century include the planting of American elms
from the Capitol to the Washington Monument by the McMillan Commission, headed by Michigan Senator James McMillan, chair of the Senate Committee on the District of Columbia, In 1912 Japan gave the United States its now-famous Japanese flowering cherries, which were planted along the Tidal Basin (see